Anisotropic Deformation and Fracture Mechanisms of an Additively Manufactured Ni-Based Superalloy

Yu, Cheng-Han; Peng, Ru Lin; Calmunger, Mattias; Luzin, Vladimir; Brodin, Hå̊kan; Moverare, Johan

doi:10.1007/978-3-030-51834-9_98

Cited by 4 publications

(10 citation statements)

References 38 publications

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“…7, a large drop in elongation to failure can be seen for the 0°specimens from 600°C to 700°C. Similar behaviour was also observed for a similar SLM alloy [52], where the drop in ductility is caused by grain boundary embrittlement. Since the 0°specimens has more grain boundaries perpendicular to the loading direction, this effect is larger in these specimens compared to 90°specimens.…”

Section: Tensile Testssupporting

confidence: 81%

Fatigue life prediction of additively manufactured ductile nickel-based superalloys : Constitutive and crack initiation modelling

Lindström

2022

Linköping Studies in Science and Technology. Dissertations

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The first part of the research project, which resulted in the Paper I, Paper II and Paper III, has been funded by the Swedish Energy Agency and Siemens Energy AB (formerly Siemens Industrial Turbomachinery AB) through the research programme Turbines for Future Energy Systems (Turbiner för framtidens energisystem), the support of which is gratefully acknowledged. The remaining part of the project, resulting in Paper IV and Paper V, has been funded by Linköping University and Siemens Energy AB. First and foremost, I would like to thank my main supervisor Associate Prof. Daniel Leidermark for your patience, encouragement and enthusiasm, and for always taking time for discussions, guidance, or anything I have on my mind. Special thanks goes also to Lic. Eng. Daniel Nilsson for all support you have provided me with regarding testing, application near questions, and for making it possible for at least some of our work to be used in "reality". I would also like to thank my research group; Prof. Kjell Simonsson, Dr. Jan-Erik Lundgren and Associate Prof. Robert Eriksson for your valuable input and support through the project.In addition, I would like to thank all Ph.D. colleagues at the Division of Solid Mechanics for, most importantly, making the Ph.D. studies a lot more fun, but also for all valuable discussions. A special thanks goes to my office mate Jordi for all your help, both at office and outside of work.Last, but not least, I would like to thank my girlfriend Ida for all your support. As we started our Ph.D. journeys almost at the same time, it has been invaluable to have someone to discuss things with at any time. However, most importantly, thank you for making my time outside work much more joyful.

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Section: Tensile Testssupporting

confidence: 81%

Fatigue life prediction of additively manufactured ductile nickel-based superalloys : Constitutive and crack initiation modelling

Lindström

2022

Linköping Studies in Science and Technology. Dissertations

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“…In the as-LPBFprocessed nickel-based superalloy, the average cellular interspacing is in the narrow range of 400-600 nm, see e.g. LPBF IN718 [162], LPBF IN625 [179], LPBF Hastelloy X [180,181], LPBF IN939 [182], LPBF IN738LC [86], and LPBF CM247LC [183]. Based on these arguments, the .…”

Section: )mentioning

confidence: 98%

Alloy Design and Characterization of γ′ Strengthened Nickel-based Superalloys for Additive Manufacturing

2021

Linköping Studies in Science and Technology. Licentiate Thesis

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Nickel-based superalloys, an alloy system bases on nickel as the matrix element with the addition of up to 10 more alloying elements including chromium, aluminum, cobalt, tungsten, molybdenum, titanium, and so on. Through the development and improvement of nickel-based superalloys in the past century, they are well proved to show excellent performance at the elevated service temperature. Owing to the combination of extraordinary high-temperature mechanical properties, such as monotonic and cyclic deformation resistance, fatigue crack propagation resistance; and high-temperature chemical properties, such as corrosion and oxidation resistance, phase stability, nickel-based superalloys are widely used in the critical hot-section components in aerospace and energy generation industries. The success of nickel-based superalloy systems attributes to both the well-tailored microstructures with the assistance of carefully doped alloying elements, and the intently developed manufacturing processes. The microstructure of the modern nickel-based superalloys consists of a two-phase configuration: the intermetallic precipitates (Ni,Co)3(Al,Ti,Ta) known as γ′ phase dispersed into the austenite γ matrix, which is firstly introduced in the 1940s. The recently developed additive manufacturing (AM) techniques, acting as the disruptive manufacturing process, offers a new avenue for producing the nickel-based superalloy components with complicated geometries. However, γ′ strengthened nickel-based superalloys always suffer from the micro-cracking during the AM process, which is barely eliminated by the process optimization. On this basis, the new compositions of γ′ strengthened nickel-based superalloy adapted to the AM process are of great interest and significance. This study sought to design novel γ′ strengthened nickel-based superalloys readily for AM process with limited cracking susceptibility, based on the understanding of the cracking mechanisms. A two-parameter model is developed to predict the additive manufacturability for any given composition of a nickel-based superalloy. One materials index is derived from the comparison of the deformation-resistant capacity between dendritic and interdendritic regions, while another index is derived from the difference of heat resistant capacity of these two spaces. By plotting the additive manufacturability diagram, the superalloys family can be categorized into the easy-to-weld, fairly-weldable, and non-weldable regime with the good agreement of the existed knowledge. To design a novel superalloy, a Cr-Co-MoW -Al-Ti-Ta-Nb-Fe-Ni alloy family is proposed containing 921,600 composition recipes in total. Through the examination of additive manufacturability, undesired phase formation propensity, and the precipitation fraction, one composition of superalloy, MAD542, out of the 921,600 candidates is selected. Validation of additive manufacturability of MAD542 is carried out by laser powder bed fusion (LPBF). By optimizing the LPBF process parameters, the crack-free MAD542 part is achieved. I...

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“…Deformation twinning is a stress-dependent deformation mechanism that can be dominant at low temperature or at high strain rate [69]. The critical stress for twinning is determined by the crystallographic orientation, where the relation of critical stress, σ <011> < σ <111> < σ <001> can be found [30,70,71]. Yet, the deformation twins are found at the grains with the crystallographic orientation close to <111>//LD instead of <011>//LD in Fig.…”

Section: Deformation Twinningmentioning

confidence: 99%

“…In our previous study on high temperature tensile behaviours of LPBF HX [23,27], we observe that the grain boundaries become weaker at elevated temperature and a significant ductility loss takes place at 700 • C under a strain rate of 10 − 3 /s. In the continuous work, the significant creep damage associated with the applied slow strain rate of 10 − 5 /s and 10 − 6 /s was investigated [28]. For the slow strain rate of 10 − 5 /s and 10 − 6 /s, continuous softening right after yielding caused by creep damage was observed, which is a significant difference to the strain rate of 10 − 3 /s.…”

Section: Introductionmentioning

confidence: 99%

“…The elongated grain structure and the anisotropic texture directly lead to anisotropic tensile behaviours, especially the ductility difference related to the building direction (BD). In addition, deformation twinning has been reported as a mechanism influencing the tensile behaviour of LPBF HX at both room temperature [29,30] and elevated temperature [28], hence, the strain-rate dependence will be investigated in this study.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic Behaviours of Lpbf Hastelloy X Under Slow Strain Rate Tensile Testing at Elevated Temperature

Yu¹,

Peng

Lee

et al. 2022

SSRN Journal

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Anisotropic Deformation and Fracture Mechanisms of an Additively Manufactured Ni-Based Superalloy

Cited by 4 publications

References 38 publications

Fatigue life prediction of additively manufactured ductile nickel-based superalloys : Constitutive and crack initiation modelling

Fatigue life prediction of additively manufactured ductile nickel-based superalloys : Constitutive and crack initiation modelling

Alloy Design and Characterization of γ′ Strengthened Nickel-based Superalloys for Additive Manufacturing

Anisotropic Behaviours of Lpbf Hastelloy X Under Slow Strain Rate Tensile Testing at Elevated Temperature

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