Creep anisotropy dominated by orientation rotation in Ni-based single crystal superalloys at 750 ℃/750 MPa

Pengfei Qu ¹Wenchao Yang ¹Chen Liu ¹Jiarun Qin ¹Qiang Wang ¹Jun Zhang ¹Lin Liu¹

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作者信息

1. State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China
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Abstract

The creep anisotropy of Ni-based single crystal superalloys was studied at 750 ℃/750 MPa.Transmission electron microscopy(TEM)observations showed that stacking faults and micro-twins were the typical dislocation configurations,which all originated from the activity of {111}<112>slip systems.Then,the orientation rotation caused by the activity of the main {111}<112>slip system would accelerate the spec-imen fracturing in shear fracture mode.Furthermore,the orientation rotation would dominate the creep anisotropy.The orientation rotation would occur during the entire creep process,the greater the degree of rotation,the more severe the asynchrony of rotation,which would result in nonuniform deformation and local stress concentration,and exacerbate the failure of the specimen.

Key words

Ni-based single crystal superalloys/Creep/Anisotropy/Orientation rotation

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基金项目

National Natural Science Foundation of China(51771148)

National Natural Science Foundation of China(52322410)

National Natural Science Foundation of China(52071263)

National Natural Science Foundation of China(52031012)

Science Center for Gas Turbine Project(P2021-A-Ⅳ-001-001)

Selfinnovation Special Fund Project of Aero Engine Corporation of China(ZZCX-2022-040)

Key Research and Development Program of Shaanxi Province(2023-YBGY-432)

Research Fund of the State Key Laboratory of Solidification Processing(NPU)China(2021-QZ-03)

Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University,China(CX2021057)

出版年

2024

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

参考文献量77

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