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Peng, Ru Lin
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Publications (10 of 184) Show all publications
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., 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
Zhou, J., Chen, Z., Persson, H., Peng, R. L., M'Saoubi, R. & Gustafsson, D. (2019). Comparative Assessment of the Surface Integrity of AD730 and IN718 Superalloys in High-Speed Turning with a CBN Tool. Journal of Manufacturing and Materials Processing, 3(3), Article ID 73.
Open this publication in new window or tab >>Comparative Assessment of the Surface Integrity of AD730 and IN718 Superalloys in High-Speed Turning with a CBN Tool
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2019 (English)In: Journal of Manufacturing and Materials Processing, ISSN 2504-4494, Vol. 3, no 3, article id 73Article in journal (Refereed) Published
Abstract [en]

Nickel-based superalloys are typical materials used in components of aeroengines and gas turbine machinery. The strength properties of these alloys at high temperatures are crucial not only to the performance (e.g., power generation efficiency, energy consumption, and greenhouse gas emissions) of aeroengines and industrial gas turbines, but also to machinability during component manufacturing. This study comparatively evaluated the surface integrity of two superalloys, AD730® and Inconel 718 (IN718), during high-speed finishing turning using cubic boron nitride (CBN) tools. IN718 is a conventional superalloy used for the hot section components of aeroengines and industrial gas turbines, while AD730® is a novel superalloy with enhanced high-temperature mechanical properties and good potential as a next-generation superalloy for these components. High-speed turning tests of two superalloys were conducted using a CBN cutting tool and jet stream cooling. The achieved surface integrity of the AD730® and IN718 superalloys was characterized and analyzed to assess the comparability of these alloys. 

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
surface integrity; AD730®; nickel-based superalloy; CBN; high-speed turning
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-159927 (URN)10.3390/jmmp3030073 (DOI)
Available from: 2019-08-28 Created: 2019-08-28 Last updated: 2019-11-22Bibliographically approved
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
Zhang, P., Sadeghimeresht, E., Chen, S., Li, X.-H., Markocsan, N., Joshi, S., . . . Peng, R. L. (2019). Effects of Surface Finish on the Initial Oxidation of HVAF-sprayed NiCoCrAlY Coatings. Surface & Coatings Technology, 364, 43-56
Open this publication in new window or tab >>Effects of Surface Finish on the Initial Oxidation of HVAF-sprayed NiCoCrAlY Coatings
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2019 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Journal of Surface and Coatings Technology, ISSN 0257-8972, Vol. 364, p. 43-56Article in journal (Refereed) Published
Abstract [en]

Oxide scale formed on HVAF-sprayed NiCoCrAlY coatings and the effect of surface treatment were investigated by a multi-approach study combining photo-stimulated luminescence, microstructural observation and mass gain. The initial oxidationbehaviour of as-sprayed, polished and shot-peened coatings at 1000 °C is studied. Both polished and shot-peened coatings exhibited superior performance due to rapid formation of α-Al2O3 fully covering the coating and suppressing the growth of transient alumina, assisted by a high density of α-Al2O3 nuclei on surface treatment induced defects. Moreover, the fast development of a two-layer alumina scale consisting of an inward-grown inner α-Al2O3 layer and an outer layer transformed from outward-grown transient alumina resulted in a higher oxide growth rate of the as-sprayed coating.

Place, publisher, year, edition, pages
Elsevier: Elsevier, 2019
Keywords
Oxidation, Transient ot alpha transformation, Surface treatment, Polishing, Shot-peening, Photo-stimulated liminescence spectroscopy
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-154936 (URN)10.1016/j.surfcoat.2019.02.068 (DOI)000463302800006 ()2-s2.0-85062231529 (Scopus ID)
Note

Funding agencies: Siemens Industrial Turbomachinery AB (Finspang, Sweden) [KME-703]; Swedish Energy Agency through KME consortium [KME-703]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [SFO-Mat-LiU 2009-00

Available from: 2019-03-06 Created: 2019-03-06 Last updated: 2019-11-04Bibliographically approved
Zhang, P., Peng, R. L. & Li, X.-H. (2019). Failure Mechanism of MCrAlY Coating at the Coating-Substrate Interface under Type I Hot Corrosion. Materials and corrosion - Werkstoffe und Korrosion, 70(9), 1593-1600
Open this publication in new window or tab >>Failure Mechanism of MCrAlY Coating at the Coating-Substrate Interface under Type I Hot Corrosion
2019 (English)In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176, Vol. 70, no 9, p. 1593-1600Article in journal (Refereed) Published
Abstract [en]

MCrAlY coatings are widely used to provide protection of hot component in modern gas turbine engines against high‐temperature oxidation and hot corrosion. Coating‐substrate interface, where the substrate is only partially covered by the coatings, is vulnerable to the hot corrosion attack. The accelerated degradation at the coating‐substrate interface can cause fast spallation of the coating, leading to the early failure of the gas turbine components. In this paper, MCrAlY powder was deposited on IN792 disks by high‐velocity oxygen‐fuel spraying. The hot corrosion behavior of the coated sample was investigated using (0.8Na, 0.2K)2SO 4 salt deposition at 900°C in lab air. Results showed a minor attack in the coating center, however, an accelerated corrosion attack at the coating‐substrate interface. The fast growth of corrosion products from substrate caused large local volume expansions at the coating‐substrate interface, resulting in an early coating spallation.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2019
Keywords
Coating-subtrate interface, hot corrosion, IN792, MCrAlY coating
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-155790 (URN)10.1002/maco.201810720 (DOI)000483817500006 ()2-s2.0-85063385770 (Scopus ID)
Note

Funding agencies:  KME consortium-ELFORSK; Linkoping University [SFO-Mat-LiU 2009-00971]

Available from: 2019-03-27 Created: 2019-03-27 Last updated: 2019-11-04Bibliographically approved
Jonnalagadda, K. P., Mahade, S., Kramer, S., Zhang, P., Curry, N., Li, X.-H. & Peng, R. L. (2019). Failure of Multilayer Suspension Plasma Sprayed Thermal Barrier Coatings in the Presence of Na2SO4 and NaCl at 900 °C. Journal of thermal spray technology (Print), 28(1-2), 212-222
Open this publication in new window or tab >>Failure of Multilayer Suspension Plasma Sprayed Thermal Barrier Coatings in the Presence of Na2SO4 and NaCl at 900 °C
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2019 (English)In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 28, no 1-2, p. 212-222Article in journal (Refereed) Published
Abstract [en]

The current investigation focuses on understanding the influence of a columnar microstructure and a sealing layer on the corrosion behavior of suspension plasma sprayed thermal barrier coatings (TBCs). Two different TBC systems were studied in this work. First is a double layer made of a composite of gadolinium zirconate + yttria stabilized zirconia (YSZ) deposited on top of YSZ. Second is a triple layer made of dense gadolinium zirconate deposited on top of gadolinium zirconate + YSZ over YSZ. Cyclic corrosion tests were conducted between 25 and 900 °C with an exposure time of 8 h at 900 °C. 75 wt.% Na2SO4 + 25 wt.% NaCl were used as the corrosive salts at a concentration of 6 mg/cm2. Scanning electron microscopy analysis of the samples’ cross sections showed that severe bond coat degradation had taken place for both the TBC systems, and the extent of bond coat degradation was relatively higher in the triple-layer system. It is believed that the sealing layer in the triple-layer system reduced the number of infiltration channels for the molten salts which resulted in overflowing of the salts to the sample edges and caused damage to develop relatively more from the edge.

Keywords
columnar microstructure, composite of gadolinium zirconate and YSZ, hot corrosion, suspension plasma spray
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
urn:nbn:se:liu:diva-154778 (URN)10.1007/s11666-018-0780-5 (DOI)000456599500019 ()2-s2.0-85055998259 (Scopus ID)
Funder
VINNOVA
Note

This article is an invited paper selected from presentations at the 2018 International Thermal Spray Conference, held May 7-10, 2018, in Orlando, Florida, USA, and has been expanded from the original presentation.

Available from: 2018-11-06 Created: 2019-02-26 Last updated: 2019-02-26
Jonnalagadda, K. P., Eriksson, R., Li, X.-H. & Peng, R. L. (2019). Fatigue life prediction of thermal barrier coatings using a simplified crack growth model. Journal of the European Ceramic Society, 39(5), 1869-1876
Open this publication in new window or tab >>Fatigue life prediction of thermal barrier coatings using a simplified crack growth model
2019 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 39, no 5, p. 1869-1876Article in journal (Refereed) Published
Abstract [en]

Models that can predict the life of thermal barrier coatings (TBCs) during thermal cycling fatigue (TCF) tests are highly desirable. The present work focuses on developing and validating a simplified model based on the relation between the energy release rate and the TCF cycles to failure. The model accounts for stresses due to thermal mismatch, influence of sintering, and the growth of TGO (alumina and other non-protective oxides). The experimental investigation of TBCs included; 1) TCF tests at maximum temperatures of 1050 °C, 1100 °C, 1150 °C and a minimum temperature of 100 °C with 1 h and 5 h (1100 °C) hold times. 2) Isothermal oxidation tests at 900, 1000 and 1100 °C for times up to 8000 h. The model was calibrated and validated with the experimental results. It has been shown that the model is able to predict the TCF life and effect of hold time with good accuracy.

Keywords
Thermal barrier coatings, Thermal cycling fatigue, Life prediction model, Energy release rate
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:liu:diva-154780 (URN)10.1016/j.jeurceramsoc.2018.12.046 (DOI)000459950700016 ()
Note

Funding agencies: Vinnova in Sweden

Available from: 2019-02-26 Created: 2019-02-26 Last updated: 2019-03-20
Jonnalagadda, K. P., Zhang, P., Gupta, M., Li, X.-H. & Peng, R. L. (2019). Hot gas corrosion and its influence on the thermal cycling performance of suspension plasma spray TBCs. In: Proceedings of ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. Paper presented at ASME Turbo Expo: Turbomachinery Technical Conference and Exposition, Phoenix, Arizona, USA, June 17-21, 2019. New York, NY: American Society of Mechanical Engineers
Open this publication in new window or tab >>Hot gas corrosion and its influence on the thermal cycling performance of suspension plasma spray TBCs
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2019 (English)In: Proceedings of ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition, New York, NY: American Society of Mechanical Engineers , 2019Conference paper, Published paper (Refereed)
Abstract [en]

Thermal barrier coatings (TBCs) manufactured with suspension plasma spray (SPS) are promising candidates for use in gas turbines due to their high strain tolerance during thermal cyclic fatigue (TCF). However, corrosion often occurs alongside thermal fatigue and coating durability under these conditions is highly desirable. The current study focuses on understanding the corrosion behavior and its influence on the thermal cyclic fatigue life of SPS TBCs. Corrosion tests were conducted at 780 OC using a mixed-gas (1SO2-0.1CO-20CO2-N2(bal.) in vol. %) for 168h. They were later thermally cycled between 100-1100 ⁰C with a 1h hold time at 1100 ⁰C. Corrosion test results indicated that the damage predominantly started from the edges and a milder damage was observed at the center. Nickel sulfide was observed on top of the top coat and also in the columnar gaps of the top coat. Chromium oxides were observed inside the top coat columnar gaps but close to the bond coat/top coat interface. They were believed to reduce the strain tolerance of SPS TBCs to an extent and also amplify the thermal mismatch stresses during TCF tests. This, together with a fast growth of alumina during the TCF, resulted in a significant drop in the TCF life compared to the standard TCF tests.

Place, publisher, year, edition, pages
New York, NY: American Society of Mechanical Engineers, 2019
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:liu:diva-161516 (URN)10.1115/GT2019-90104 (DOI)000502167600050 ()978-0-7918-5867-7 (ISBN)
Conference
ASME Turbo Expo: Turbomachinery Technical Conference and Exposition, Phoenix, Arizona, USA, June 17-21, 2019
Note

Funding agencies: Vinnova in SwedenVinnova

Available from: 2019-11-04 Created: 2019-11-04 Last updated: 2020-01-09Bibliographically approved
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
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