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  • 1.
    Bacos, M P
    et al.
    Office National d'Etudes et de Recherches Aérospatiales, France.
    Josso, P
    Office National d'Etudes et de Recherches Aérospatiales, France.
    Vialas, N
    CIRIMAT––ENSIACET-INPT, Toulouse, France.
    Poquillon, D
    CIRIMAT––ENSIACET-INPT, Toulouse, France.
    Pieraagi, B
    CIRIMAT––ENSIACET-INPT, Toulouse, France.
    Monceau, D
    CIRIMAT––ENSIACET-INPT, Toulouse, France.
    Nicholls, J R
    Cranfield University, United Kingdom.
    Simms, N
    Cranfield University, United Kingdom.
    Encinas-Oropesa, A
    Cranfield University, United Kingdom.
    Ericsson, Torsten
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Stekovic, Svjetlana
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    ALLBATROS advanced long life blade turbine coating systems2004Inngår i: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 24, nr 11-12, s. 1745-1753Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The scientific and technological objectives of this program are to increase the efficiency, reliability and maintainability of industrial gas turbine blades and vanes by

    • developing coatings that can warrant a 50 000 h life, i.e. twice that of the usual life, of the hot components (800–1100 °C) even with the use of renewable fuels such as biomass gas or recovery incinerator gas i.e. low-grade fuels with high pollutant levels,

    • characterising advanced existing coatings to assess lifetime and performance of coatings and coated materials,

    • providing material coating data and design criteria to use coating as a design element,

    • increasing the fundamental understanding of the behaviour of coated materials, their degradation, fracture mechanisms and engineering because of the strong need for a mechanism-based modelling of durability.

    These programmes permitted the selection of two reference coatings and the development of two innovative coatings. Concurrently work has been done in order to develop corrosion, oxidation and thermo-mechanical property models. Correlations between coatings development, experimental results and calculations will be discussed.

  • 2.
    Bacos, M-P
    et al.
    Office National DÉtude et de Recherces Aerospatiales Chatillon Cedex France.
    Josso, P
    Office National DÉtude et de Recherces Aerospatiales Chatillon Cedex France.
    Vialas, N
    CIIRMAT Toulouse, France.
    Poquillon, D
    CIRIMAT Toulouse.
    Pierraggi, B
    CIRIMAT Toulouse. France.
    Monceau, D
    CIRIMAT Toulouse, France.
    Nicholls, J R
    Cranfield University Bedford, UK.
    Simms, N
    Cranfield University Bedford.
    Encinas-Oropesa, A
    Cranfiled University Bedford, UK.
    Ericsson, Torsten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Stekovic, Svjetlana
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    ALLBATROS Advanced Long Life BlAde TuRbine COating Systems2003Inngår i: The First International Conference on Gas Turbine Technologies,2003, 2003Konferansepaper (Fagfellevurdert)
  • 3.
    Bergquist, B
    et al.
    Lulea Tekniska Univ, Div Qual Technol & Stat, Dept Business Adm & Social Sci, SE-97187 Lulea, Sweden Linkoping Univ, Div Engn Mat, Dept Mech Engn, SE-58183 Linkoping, Sweden.
    Ericsson, Torsten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial.
    Robustness simulation of water atomisation2000Inngår i: Powder Metallurgy, ISSN 0032-5899, E-ISSN 1743-2901, Vol. 43, nr 1, s. 37-42Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    One of the main purposes of water atomisation is to keep the powder size distribution within a close range. The process is difficult to monitor and thus the state of today's process control is poor. To investigate this process, both a laboratory scale and an industrial scale atomisation facility were modelled where melt flow and thermal flow were investigated. The results showed that metal temperature is important if stable particle sizes are to be obtained from batch to batch.

  • 4.
    Brodin, Håkan
    et al.
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Ericsson, Torsten
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Behaviour of a Thermal Barrier Coating during High Temperature OxidationManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    An air plasma sprayed thermal barrier coating was investigated in order to clarify links between heat treatment, oxidation and diffusion behaviour. In the study a thin Zirconia (PSZ) layer was used as top coat together with a NiCoCrAlY bond coat. The investigation was focused on differences for three geometries. Thermal barrier coatings on flat, concave and convex surfaces were studied. Isothermal oxidation was performed up to 1000 hrs at 1000°C in order to simulate true working conditions for the interface between ceramic top coat and metallic bond coat. The investigations show presence of Al-rich oxides for shorter times. When the coating system is heat-treated for 1000 hrs a change of oxide composition is obvious and beside Al the oxides contain Ni, Cr and Co. The oxides tend to grow with different rates depending on the macroscopic surface geometry. In the study convex surfaces reveal the highest oxide growth rates and concave the lowest growth rates. At 1000 hrs and 1000°C the difference between the fastest and the slowest growing oxide layer is 1 μm. Some interdiffusion is obvious. Between the superalloy substrate and the bond coat outward diffusion of Ni, W and Cr is present together with inward diffusion of Co and to some extent Al.

  • 5.
    Brodin, Håkan
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Ericsson, Torsten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Behaviour of a Thermal Barrier Coating during High Temperature Oxidation2000Inngår i: ASM International Heat Treating Congress,2000, 2000Konferansepaper (Fagfellevurdert)
  • 6.
    Brodin, Håkan
    et al.
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Ericsson, Torsten
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Influence of high temperature exposure on thermal barrier coating behaviourManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    An air plasma sprayed thermal barrier coating was investigated in order to clarify links between heat treatment, oxidation and diffusion behaviour. In the study a thin Zirconia (PSZ) layer was used as top coat together with a NiCoCrAIY bond coat. The investigation was focused on differences for three geometries. Thermal barrier coatings on flat, concave and convex surfaces were studied. Isothermal oxidation was performed up to 1000 hrs at 1000°C in order to simulate true working conditions for the interface between ceramic top coat and metallic bond coat. The investigations show presence of Al-rich oxides for shorter times. When the coating system is heat-treated for 1000 hrs a change of oxide composition is obvious and beside AI the oxides contain Ni, Cr and Co. The oxides tend to grow with different rates depending on the macroscopic surface geometry. In the study concave surfaces reveal the highest oxide growth rates and convex the lowest growth rates. At 1000 hrs and 1 000°C the difference between the fastest and the slowest growing oxide layer is 1µm. Some interdiffusion is obvious. Between the superalloy substrate and the bond coat outward diffusion of Ni, W and Cr is present together with inward diffusion of Co and to some extent Al.

  • 7.
    Ericsson, Torsten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    High resolution X-ray tomography applied to internal surfaces in metal foams1999Inngår i: 12o Collogue Internation sur les Methodes dInvestigation Physico Chimique et Mecanique des Surfaces,1999, 1999Konferansepaper (Fagfellevurdert)
  • 8.
    Ericsson, Torsten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Laser coating technologies2005Inngår i: Handbook on residual stress. Vol. 1: Residual stress: manufacturing and materials processing / [ed] Jian Lu, 2005, 2Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 9.
    Ericsson, Torsten
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Laser Coating Technologies1996Inngår i: Handbook of Measurement of Residual Stresses / [ed] Jian Lu, Lilburn, Ga./Upper Saddle River, N.J.: Fairmont Press/Prentice Hall , 1996, s. 269-283Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 10.
    Ericsson, Torsten
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Residual Stress after Quenching1996Inngår i: Handbook of Measurement of Residual Stresses / [ed] Jian Lu, Lilburn, Ga./Upper Saddle River, N.J.: Fairmont Press/Prentice Hall , 1996, s. 169-183Kapittel i bok, del av antologi (Annet vitenskapelig)
    Abstract [en]

    With contributions from 24 authorities from around the world, this handbook provides the most authoritative reference resource available on the impact of residual stresses on mechanical properties of materials and structures. You'll find detailed descriptions of a full range of measuring techniques, including hole drilling, layer removal, sectioning, X-ray diffraction, neutron diffraction, and ultrasonic methods. A variety of case studies which illustrate use of specific techniques are included to facilitate your understanding. Design and structural engineers, metallurgists, and material scientists will find a wealth of valuable information covering recent developments in residual stress measuring techniques, with guidelines provided for selecting the right measuring strategy for each specific application, and many helpful tips for improving quality control.

  • 11.
    Ericsson, Torsten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Residual Stress Induced by Heat Treatment and Thermochemical Treatment2000Inngår i: 20th ASM Heat Treating Society Conference,2000, ASM International, 2000, s. 392-401Konferansepaper (Fagfellevurdert)
    Abstract [en]

    All heat treatments including thermochemical heat treatments give rise to residual stresses in steel. A number of computer models have been developed for calculating temperature and phase distributions as well as residual macrostresses. They are implemented in several commercial codes which are listed. To some extent it is now possible to tailor make residual stress profiles by controlling process parameters. In this paper an overview of the state of the art of modeling is made for martensitic hardening nitriding and laser cladding. The importance of being able to predict residual microstresses in all phases in multiphase structures is emphasised and some examples are given. It is concluded that much work remains to be done until it has reach the same maturity as the modling of macrostresses. Professor J. B. Cohen has made great contributions in this field.

  • 12.
    Ericsson, Torsten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Residual Stresses in Laser Claddded Layers2003Bok (Annet vitenskapelig)
  • 13.
    Ericsson, Torsten
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Residual Stresses Produced by Quenching of Martensitic Steels2014Inngår i: Comprehensive Materials Processing, Elsevier, 2014, s. 271-298Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 14.
    Ericsson, Torsten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    The effect of final shaping prior to heat treatment2001Annet (Annet (populærvitenskap, debatt, mm))
  • 15.
    Ericsson, Torsten
    et al.
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Larsson, Cecilia
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Peng, Ru
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Studies of residual stress, microcracks, hardness and microstructure of cold compacted metallic green bodies2003Inngår i: Materials Research Society Symposium Proceedings, ISSN 0272-9172, E-ISSN 1946-4274, Vol. 759, s. 53-64Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The residual stresses have been measured by X-ray and neutron diffraction on PM green bodies manufactured by conventional and high speed compaction of iron powder with and without added copper and brass powder. Compressive residual stresses are present in a thin layer in both top and side surfaces. They are largest in the side surfaces due to plastic deformation of the surface material caused by the friction forces during ejection out of the die. In the interior of the green body residual stresses exist with certain region under compression (periferical regions) and other under tension (more central regions). It is unclear whether mixing iron powder with brass or copper powder leads to considerable phase stresses between the two phases.

  • 16.
    Ericsson, Torsten
    et al.
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Luukkonen, Petri
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Residual stresses in green bodies of steel powder after conventional and high speed compaction2002Inngår i: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 404-407, s. 77-82Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Residual stresses have been measured in green bodies after conventional compaction at 400 and 530 MPa and after high speed compaction with impact energies of 1400J and. 2200J. The former were rectangular bars and the latter cylinders. The stresses have been measured by X-ray and neutron diffraction. The full width half maximum peak widths were also recorded. :ft was found that all surfaces had compressive residual stresses in the range 5 to 90 MPa, the largest values found on side surfaces that had been deformed in shear during ejection from the die. The presence of lubricant reduces the residual stress values. The powders were basically water atomised iron powder: Hoganas ASC 100.29, Distalloy AE and Pasc.

  • 17.
    Hosseini, Mehrdad
    et al.
    IKP, Konstruktionsmaterial Linköpings universitet.
    Ericsson, Torsten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Residual Stresses in Laser Cladded Layers2000Inngår i: ASM International Heat Treating Congress,2000, Ohio, USA: Materials Park, Ohio ASM International, the Materials Information Society 2000 , 2000Konferansepaper (Fagfellevurdert)
  • 18.
    Larsson, Cecilia
    et al.
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Ericsson, Torsten
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Residual stress and mechanical property evaluation of compacted iron-brass powders using neutron diffracation and instrumented indentationManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    Neutron diffraction was used to measure residual stresses in a powder metallurgical green body manufactured by high speed compaction of iron and 15 wt.% brass powders. The tests were performed with the aid of radial collimators configured to measure spatially resolved strains in the axial and radial directions in a cylindrical specimen. Compressive residual stresses were present in the iron phase and appear to be larger in the lower to middle sections along the specimen's axis. Furthermore, a combination of sharp (Berkovich) and spherical (Hertzian) indenters were used for instrumented indentation experiments. The results from the spherical indenter were used to determine the elastic modulus, while results from the sharp indenter were used to measure the hardness.

  • 19.
    Luukkonen, Petri
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Ericsson, Torsten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Residual Stresses in Green Bodies of Steel Powder and Their Relaxation during Heat Treatment2000Inngår i: 20th ASM Heat Teating Society Conference,2000, ASM International, 2000, s. 435-440Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Stresses and residual stresses have been measured in rectangular bars after compaction under 400 and 530 MPa after the removal of the pressure and in three positions: The bar completely inside the die, the bar partially outside and the bar completely free. The stresses have been measured by X-ray and neutron diffraction. It was found that stresses around 35 MPa in compression on the top surface prevail when the bar is inside the die and it is reduced to half when the bar is partly outside and even more when completely outside the die. However on the side surfaces considerable compressive residual stresses exist in the free bar in a thin surface layer and tensile residual stresses below this layer. It is proposed that plastic deformation of the side surface during ejection is a major cause for the residual stresses. Heat treatment at 450°C decreases the residual stresses. Two different powders have been used: Höganäs ASC 100.29 with lubricant added and Höganäs Distaloy AE without lubricant. The presence of lubricant reduces the residual stresses. Direct current potential drop, DCPD, measurements have also been carried out and are discussed together with the residual stress data.

  • 20.
    Luukkonen, Petri
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Ericsson, Torsten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Robust direct current potential drop method to inspect cold pressed green bodies2003Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The basics of the direct current potential drop (DCPD) method is presented. It is applied to studies of pressing defects in green bodies made of iron based powders. Three types of bodies are studied: rectangular bars, two level L shaped bodies and a multilevel industrial body. It is found that by using ratios of potential drop (PD) between defective and defect free areas of a body the method becomes more insensitive to disturbances. For this purpose a five electrode probe has been designed. An analysis of the statistical scatter indicates that the DCPD method is more suited to find the correct press settings than to look for defective specimens under production.

  • 21.
    Luukkonen, Petri
    et al.
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Hjortsberg, Erik
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Ericsson, Torsten
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Potential drop measurements of porosity in PM green bodies2003Inngår i: Powder Metallurgy, ISSN 0032-5899, E-ISSN 1743-2901, Vol. 46, nr 4, s. 335-341Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The direct current potential drop method (DCPD) has been applied to four differently shaped green bodies made of iron based powders. The density and porosity has been measured in the bodies and correlated with potential drop. When the porosity is well known, a good correlation between potential drop and porosity is found. By comparison with literature it is concluded that the potential drop in green bodies varies more with porosity than in sintered bodies.

  • 22.
    Peng, Ru
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Ericsson, Torsten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Johansson, Sten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Thorsson, Lena
    IUC Karlskoga AB .
    Residual Stresses in Metallic Samples Produced byh Laser FreeForm Fabrication2004Inngår i: 10th Swedish Neutron Scattering Society Meeting,2004, 2004Konferansepaper (Annet vitenskapelig)
  • 23.
    Peng, Ru
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Johansson, Sten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Ericsson, Torsten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Thorsson, Lena
    IUC Karlskoga AB Karlskoga.
    Residual Stresses Induced by Laser FreeForm Fabrication2005Inngår i: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 490-491, s. 334-339Artikkel i tidsskrift (Fagfellevurdert)
  • 24.
    Peng, Ru
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Johansson, Sten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Thorsson, Lena
    IUC Karlskoga AB .
    Ericsson, Torsten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Residual stresses Induced by Laser FreeForm Fabrication2004Inngår i: ICRS7,2004, 2004Konferansepaper (Fagfellevurdert)
  • 25.
    Stekovic, Svjetlana
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Ericsson, Torsten
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Influence of Long Term Aging on Microstructure and Low Cycle Fatigue Behaviour of Two Coated Nickel-Base Superalloys2007Manuskript (preprint) (Annet vitenskapelig)
  • 26.
    Stekovic, Svjetlana
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Ericsson, Torsten
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Low-Cycle Fatigue and Damage of an Uncoated and Coated Single Crystal Nickel-Bse Superalloy SCB2007Inngår i: International Journal of Materials Research, ISSN 1862-5282, Vol. 98, nr 1, s. 26-32Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents low-cycle fatigue (LCF) behaviour and damage mechanisms of uncoated and coated specimens of a single crystal nickel-base superalloy SCB tested at 500°C and 900°C. Four coatings were deposited on the base material, an overlay coating AMDRY997, a platinum-modified aluminide diffusion coating RT22 and two innovative coatings called IC1 and IC3 with a NiWdiffusion barrier in the interface. AMDRY997 and RT22 were used as reference coatings. The LCF tests were performed at three strain amplitudes, 1.0, 1.2 and 1.4%, with R ¼ % 1, in laboratory air and without any dwell time. The LCF life of the specimens is determined by crack initiation and propagation. Crack data are presented for different classes of crack size in the form of crack density, that is, the number of cracks normalised to the investigated interface length. Micrographs of damage of the coatings are also shown.

    The effect of the coatings on the LCF life of the superalloy was dependent on the test temperature and deposited coating. At 500°C all coatings had a detrimental effect on the LCF life of the superalloy. At 900°C both AMDRY997 and IC1 prolonged the fatigue life of the superalloy by factors ranging between 1.5 and 4 while RT22 and IC3 shortened the life of the coating–substrate system. Specimens coated with RT22 exhibited generally more damage than other tested coatings at 9008 C. Most of the cracks observed initiated at the coating surface and a majority were arrested in the interdiffusion zone between the base material and the coating. No topologically close-packed phases were found. Delamination was only found in AMDRY997 at higher strains. Surface roughness or rumpling was found in the overlay coating AMDRY997 with some cracks initiating from the rumples. The failure morphology at 900°C reflected the role of oxidation in the fatigue life, the crack initiation and propagation of the coated specimens. The wake of the cracks grown into the substrate was severely oxidised leading to the loss of Al and Ti to the oxide and resulting in the formation of a ϒ’ depleted zone. The cracks grew more or less perpendicular to the load axis in a Stage II manner.

     

  • 27.
    Stekovic, Svjetlana
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Ericsson, Torsten
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Konstruktionsmaterial.
    Thermo-Mechanical and Low Cycle Fatigue of Two Uncoated and Coated Single Crystal Nickel-Base Superalloys, CMSX-4 and SCB2007Inngår i: Fatigue 2007 - The 6th Engineering Integrity Society International Conference on Durability and Fatigue,2007, 2007Konferansepaper (Annet vitenskapelig)
  • 28.
    Stekovic, Svjetlana
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Ericsson, Torsten
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Johansson, Sten
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Comparison of Low-Cycle Fatigue Properties of Two Coated Single Crystal Nickel-Base Superalloys, CMSX-4 and SCB2006Inngår i: 9th International Fatigue Congress, 2006Konferansepaper (Fagfellevurdert)
  • 29.
    Stekovic, Svjetlana
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Moverare, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Ericsson, Torsten
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska högskolan.
    Low Cycle Fatigue, Thermo-Mechanical Fatigue and Failure of an Uncoated and Coated Polycrystalline Nickel-Base Superalloy IN7922007Inngår i: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940Artikkel i tidsskrift (Fagfellevurdert)
1 - 29 of 29
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