Correlation Between the Microstructural Defects and Residual Stress in a Single Crystal Nickel-Based Superalloy During Different Creep Stages

Fangjie Mo; Erdong Wu; Changsheng Zhang; Hong Wang; Zhengye Zhong; Jian Zhang; Bo Chen; Michael Hofmann; Weimin Gan; Guangai Sun

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자료유형: 학술저널

저자정보: Fangjie Mo (Key Laboratory for Neutron Physics of Chinese Academy of Engineering Physics) Erdong Wu (Shenyang National Laboratory for Materials Science) Changsheng Zhang (Key Laboratory for Neutron Physics of Chinese Academy of Engineering Physics) Hong Wang (Key Laboratory for Neutron Physics of Chinese Academy of Engineering Physics) Zhengye Zhong (Key Laboratory for Neutron Physics of Chinese Academy of Engineering Physics) Jian Zhang (Shenyang National Laboratory for Materials Science) Bo Chen (Key Laboratory for Neutron Physics of Chinese Academy of Engineering Physics) Michael Hofmann (Technische Universität München) Weimin Gan (German Engineering Materials Science Centre at MLZ) Guangai Sun (Key Laboratory for Neutron Physics of Chinese Academy of Engineering Physics)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.5

발행연도: 2018.1

수록면: 1,002 - 1,011 (10page)

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The present work attempts to reveal the correlation between the microstructural defects and residual stress in the singlecrystal nickel-based superalloy, both of which play the signifi cant role on properties and performance. Neutron diff ractionwas employed to investigate the microstructural defects and residual stresses in a single crystal (SC) nickel-based superalloy,which was subjected to creeping under 220 MPa and 1000 °C for different times. The measured superlattice andfundamental lattice refl ections confi rm that the mismatch and tetragonal distortions with c / a > 1 exist in the SC superalloy. At the initially unstrained state, there exists the angular distortion between γ and γ’ phases with small triaxial compressivestresses, ensuring the structural stability of the superalloy. After creeping, the tetragonal distortion for the γ phase is largerthan that for the γ’ phase. With increasing the creeping time, the mismatch between γ and γ’ phases increases to the maximum,then decreases gradually and fi nally remains unchanged. The macroscopic residual stress shows a similar behaviorwith the mismatch, indicating the correlation between them. Based on the model of shear and dislocations, the evolution ofmicrostructural defects and residual stress are reasonably explained. The effect of shear is dominant at the primary creepstage, which greatly enlarges the mismatch and the residual stress. The dislocations weaken the effect of shear for the furthercreep stage, resulting in the decrease of the mismatch and relaxation of the residual stress. Those fi ndings add some helpfulunderstanding into the microstructure-performance relationship in the SC nickel-based superalloy, which might provide theinsight to materials design and applications.

참고문헌 (35)

참고문헌 신청

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E. Wu / 2013 / Acta Mater. 61:2308

J. Coakley / 2012 / Acta Mater. 60:2729

C.M.F. Rae / 2007 / Acta Mater. 55:1067

T. Link / 2005 / Mater. Sci. Eng., A 405:254

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