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Zhang, P., Li, X.-H., Moverare, J. & Peng, R. L. (2020). The iron effect on hot corrosion behaviour of MCrAlX coating in the presence of NaCl at 900 °C. Journal of Alloys and Compounds, 815, Article ID 152381.
Open this publication in new window or tab >>The iron effect on hot corrosion behaviour of MCrAlX coating in the presence of NaCl at 900 °C
2020 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 815, article id 152381Article in journal (Refereed) Published
Abstract [en]

Cyclic hot corrosion tests of two MCrAlX coatings with different Fe contents were carried out in a molten salt (75 wt% Na2SO4 + 25 wt% NaCl) environment at 900 °C under type I hot corrosion. The positive effect of high Fe addition which reduces the advancing of corrosion front in the coating was discussed. The experimental results showed that the main corrosion reaction is the basic fluxing of Al, while Fe is relatively inert. Combined with thermodynamic modelling, it was demonstrated that a high Fe addition in MCrAlX coatings shifts the equilibrium Al content of the γ phase towards a low level and also reduces the loss of Cr from coating to the substrate. Both effects contributed to a higher “effective” Al supply of the coating to resist basic fluxing and thereby enhance the coating resistance to hot corrosion by reducing the rate of advancing of the corrosion front.

Keywords
Iron effect, Type I hot corrosion, MCrAlX coating, Thermodynamic, Effective Al content
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:liu:diva-161512 (URN)10.1016/j.jallcom.2019.152381 (DOI)000502521900072 ()
Note

Funding agencies: Siemens Industrial Turbomachinery AB (Finspang, Sweden); Swedish Energy Agency through the KME consortium [KME-703]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Link_oping University [SFO-Mat-LiU 2009-00971]

Available from: 2019-11-04 Created: 2019-11-04 Last updated: 2020-01-02Bibliographically approved
Yu, C.-H. & Moverare, J. (2019). Anisotropic Mechanical Properties of Thin-walled Hastelloy X by Selctive Laser Melting. In: : . Paper presented at EUROMAT19, Stockholm 1-5 September 2019.
Open this publication in new window or tab >>Anisotropic Mechanical Properties of Thin-walled Hastelloy X by Selctive Laser Melting
2019 (English)Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

Introduction/Purpose

The study of thin-walled structure improves the design freedom of additive manufacturing. Understanding the relation between anisotropic mechanical properties and microstructure gives better control on manufacturing process and challenges the limit of the practical application. As one of the key Ni-based superalloy in aerospace industries, thin-walled Hastelloy X will be beneficial to the light weight application and build a more sustainable environment.

Methods

Thin-walled structures with different thickness form 1mm to 4mm was built by Selective Laser Melting process from EOS M290 machine, and the used powder was EOS NickelAlloy HX. The microstructure and crystallographic orientation have been studied by SEM and EBSD. Tensile tests with directions parallel and perpendicular to building direction (BD) have been carried out at elevated temperature from 400˚C to 700˚C.

Results

The elongated grains have been observed partly parallel and partly 45˚ tilted to the BD from back scattered SEM images, and the contouring region shows smaller grain size . Along the BD, the major preferred orientation is <101> and the minor is <001>. The tensile test result indicates higher strength but lower elongation in the direction perpendicular to BD, and also a big elongation drop between 600˚C and 700˚C. EBSD result from highly deformed area shows different texture evolution mechanism between two different tensile directions.

Conclusions

The local thermal gradient created by the scanning strategy guides the grain growing direction, which is <001>, and <101> turns to be the preferred orientation along BD. The elongated grains are the main reason for the anisotropic mechanical properties. When the tensile direction is parallel to BD, the orientation evolution fits the theory and indicates lattice rotation.

National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-162823 (URN)
Conference
EUROMAT19, Stockholm 1-5 September 2019
Available from: 2019-12-19 Created: 2019-12-19 Last updated: 2020-03-09Bibliographically approved
Yu, C.-H., Peng, R. L., Lundgren, J.-E. & Moverare, J. (2019). Anisotropic Mechanical Properties of Thin-walled Hastelloy X Manufactured by Laser Powder Bed Fusion. In: : . Paper presented at EURO PM2019 - Additive Manufacturing, Maastricht, 2019 October 13-16.
Open this publication in new window or tab >>Anisotropic Mechanical Properties of Thin-walled Hastelloy X Manufactured by Laser Powder Bed Fusion
2019 (English)Conference paper, Oral presentation only (Refereed)
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-162608 (URN)
Conference
EURO PM2019 - Additive Manufacturing, Maastricht, 2019 October 13-16
Available from: 2019-12-11 Created: 2019-12-11 Last updated: 2019-12-11
Chen, Z., Peng, R. L., Zhou, J., M'Saoubi, R., Gustafsson, D. & Moverare, J. (2019). Effect of Machining Parameters on Cutting Force and Surface Integrity when High-Speed Turning AD730™ with PCBN Tools. The International Journal of Advanced Manufacturing Technology, 100(9-12), 2601-2615
Open this publication in new window or tab >>Effect of Machining Parameters on Cutting Force and Surface Integrity when High-Speed Turning AD730™ with PCBN Tools
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2019 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 100, no 9-12, p. 2601-2615Article in journal (Refereed) Published
Abstract [en]

The novel wrought nickel-based superalloy, AD 730™, is a good candidate material for turbine disc applications at high temperatures beyond 650 °C. The present study focuses on the machining performance of this newly developed alloy under high-speed turning conditions with advanced PCBN tools. Meanwhile, the machined surface integrity as influenced by cutting speed and feed rate was also investigated. The surface integrity was thoroughly characterized in terms of surface roughness and morphology, machining-induced plastic deformation, white layer formation, and residual stresses. It has been found that the cutting speed and feed rate had a strong effect on the cutting forces and resultant surface integrity. The cutting forces required when machining the alloy were gradually reduced with increasing cutting speed, while at 250 m/min and above, the flank tool wear became stronger which led to increased thrust force and feed force. A higher feed rate, on the other hand, always resulted in higher cutting forces. Increasing the cutting speed and feed rate in general deteriorated the surface integrity. High cutting speeds within the range of 200–250 m/min and a low feed rate of 0.1 mm/rev are preferable in order to implement more cost-effective machining without largely reducing the surface quality achieved. The formation of tensile residual stresses on the machined AD 730™, however, could be of a concern where good fatigue resistance is critical.

Place, publisher, year, edition, pages
Springer London, 2019
Keywords
Nickel-based superalloy, High-speed turning, Cutting forces, Surface integrity, AD730, Cubic boron nitride (CBN) tool
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-153292 (URN)10.1007/s00170-018-2792-1 (DOI)000458310400032 ()2-s2.0-85055531180 (Scopus ID)
Available from: 2018-12-10 Created: 2018-12-10 Last updated: 2019-03-05Bibliographically approved
Calmunger, M., Wärner, H., Chai, G., Johansson, S. & Moverare, J. (2019). High Temperature Properties of Austenitic Stainless Steels for Future Power Plant Applications. In: : . Paper presented at EUROMAT19, Stockholm 2-5 September 2019.
Open this publication in new window or tab >>High Temperature Properties of Austenitic Stainless Steels for Future Power Plant Applications
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2019 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-162815 (URN)
Conference
EUROMAT19, Stockholm 2-5 September 2019
Available from: 2019-12-19 Created: 2019-12-19 Last updated: 2019-12-19
Wärner, H., Eriksson, R., Chai, G., Moverare, J., Johansson, S. & Calmunger, M. (2019). Influence of Ageing on Thermomechaical Fatigue of Austenitic Stainless Steels. In: Elsevier (Ed.), Structural Integrity Procedia: . Paper presented at 9th International Conference on Materials Structures and Micromechanics of Fracture, MSMF9, in Brno, Czech Republic, June 26-28, 2019. Elsevier
Open this publication in new window or tab >>Influence of Ageing on Thermomechaical Fatigue of Austenitic Stainless Steels
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2019 (English)In: Structural Integrity Procedia / [ed] Elsevier, Elsevier, 2019Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Thermomechanical fatigue, Austenitic stainless steels, Ageing, Barrelling effect
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-161737 (URN)
Conference
9th International Conference on Materials Structures and Micromechanics of Fracture, MSMF9, in Brno, Czech Republic, June 26-28, 2019
Available from: 2019-11-08 Created: 2019-11-08 Last updated: 2019-11-12
Kihlberg, E., Norman, V., Skoglund, P., Schmidt, P. & Moverare, J. (2019). Investigation of Microstructure Parameters and Thermo-Mechanical Fatigue Performance of Cast Iron. In: : . Paper presented at 4th International Workshop on Thermo-Mechanical Fatigue, Berlin 13-15 November 2019.
Open this publication in new window or tab >>Investigation of Microstructure Parameters and Thermo-Mechanical Fatigue Performance of Cast Iron
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2019 (English)Conference paper, Oral presentation only (Refereed)
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-162822 (URN)
Conference
4th International Workshop on Thermo-Mechanical Fatigue, Berlin 13-15 November 2019
Available from: 2019-12-19 Created: 2019-12-19 Last updated: 2020-02-06
Wärner, H., Calmunger, M., Chai, G. & Moverare, J. (2019). Microscopic Evaluation of Creep-Fatigue Interaction in Heat Resistant Austenic Alloys. In: : . Paper presented at EUROMAT19, Stockholm 2-5 September 2019.
Open this publication in new window or tab >>Microscopic Evaluation of Creep-Fatigue Interaction in Heat Resistant Austenic Alloys
2019 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-162817 (URN)
Conference
EUROMAT19, Stockholm 2-5 September 2019
Available from: 2019-12-19 Created: 2019-12-19 Last updated: 2019-12-19
Xu, J., Gruber, H., Deng, D., Peng, R. L. & Moverare, J. (2019). Short-term Creep Behavior of an Additive Manufactured Non-weldable Nickel-base Superalloy Evaluated by Slow Strain Rate Testing. Acta Materialia, 179, 142-157
Open this publication in new window or tab >>Short-term Creep Behavior of an Additive Manufactured Non-weldable Nickel-base Superalloy Evaluated by Slow Strain Rate Testing
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2019 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 179, p. 142-157Article in journal (Refereed) Published
Abstract [en]

Additive manufacturing (AM) of high γ′ strengthened Nickel-base superalloys, such as IN738LC, is of high interest for applications in hot section components for gas turbines. The creep property acts as the critical indicator of component performance under load at elevated temperature. However, it has been widely suggested that the suitable service condition of AM processed IN738LC is not yet fully clear. In order to evaluate the short-term creep behavior, slow strain rate tensile (SSRT) tests were performed. IN738LC bars were built by laser powder-bed-fusion (L-PBF) and then subjected to hot isostatic pressing (HIP) followed by the standard two-step heat treatment. The samples were subjected to SSRT testing at 850 °C under strain rates of 1 × 10−5/s, 1 × 10−6/s, and 1 × 10−7/s. In this research, the underlying creep deformation mechanism of AM processed IN738LC is investigated using the serial sectioning technique, electron backscatter diffraction (EBSD), transmission electron microscopy (TEM). On the creep mechanism of AM polycrystalline IN738LC, grain boundary sliding is predominant. However, due to the interlock feature of grain boundaries in AM processed IN738LC, the grain structure retains its integrity after deformation. The dislocation motion acts as the major accommodation process of grain boundary sliding. Dislocations bypass the γ′ precipitates by Orowan looping and wavy slip. The rearrangement of screw dislocations is responsible for the formation of subgrains within the grain interior. This research elucidates the short-creep behavior of AM processed IN738LC. It also shed new light on the creep deformation mechanism of additive manufactured γ′ strengthened polycrystalline Nickel-base superalloys.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Nickel-base superalloy, laser processing, creep, grain boundary sliding, dislocations
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-161742 (URN)10.1016/j.actamat.2019.08.034 (DOI)000488417400013 ()2-s2.0-85071224254 (Scopus ID)
Note

Funding Agencies|Swedish Governmental Agency for Innovation Systems, (Vinnova)Vinnova [2016-05175, 2018-00804]; Linkoping University [2009-00971]

Available from: 2019-11-08 Created: 2019-11-08 Last updated: 2019-12-13Bibliographically approved
Wärner, H., Calmunger, M., Chai, G., Johansson, S. & Moverare, J. (2019). Structural Integrity and Impact Toughness of Austenitic Stainless Steels. In: Proceedings of the 13th International Conference on the Mechanical Behaviour of Materials: . Paper presented at 13th International Conference on the Mechanical Behaviour of Materials (ICM13), 11-14 June 2019, Melbourne, Australia.
Open this publication in new window or tab >>Structural Integrity and Impact Toughness of Austenitic Stainless Steels
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2019 (English)In: Proceedings of the 13th International Conference on the Mechanical Behaviour of Materials, 2019Conference paper, Published paper (Refereed)
Keywords
Austenitic stainless steels, long-term ageing, impact toughness, fracture mechanisms
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-162679 (URN)978-1-922016-65-2 (ISBN)
Conference
13th International Conference on the Mechanical Behaviour of Materials (ICM13), 11-14 June 2019, Melbourne, Australia
Available from: 2019-12-16 Created: 2019-12-16 Last updated: 2019-12-16
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-8304-0221

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