In-situ SEM and EBSD study on fretting fatigue crack initiation of a directionally solidified Ni-based superalloy

被引：13

作者：

Han, Qinan ^{[1
]}

Wang, Wei ^{[1
]}

Fang, Jianwen ^{[1
]}

Cui, Haitao ^{[1
]}

Zhang, Hongjian ^{[1
]}

Yang, Xiaolin ^{[1
,2
]}

Mu, Qinqin ^{[2
]}

Xu, Jian ^{[2
]}

Shi, Huiji ^{[3
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Informat Technol Coll Energy & Power Engn, Aeroengine Thermal Environm & Struct Key Lab, Minist Ind, Nanjing 210016, Peoples R China

[2] Aircraft Strength Res Inst China, Xian 710065, Peoples R China

[3] Tsinghua Univ, Dept Engn Mech, AML, Beijing 100084, Peoples R China

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2022年 / 161卷

关键词：

Fretting fatigue; In-situ SEM; Crack initiation; EBSD; Superalloy; DISLOCATION DENSITY; SLIP; ORIENTATION; TEMPERATURE; FREQUENCY; BEHAVIOR; NICKEL; FORCE; SIZE;

D O I：

10.1016/j.ijfatigue.2022.106908

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Fretting fatigue is an important cause of the failure of the turbine blade-disc dovetail joint in aero-engines. In this work in-situ scanning electron microscope (SEM) fretting fatigue experiments using dovetail shape specimens were conducted. The fretting fatigue damage process of Ni-based directionally solidified superalloys including slip trace evolution and crack initiation was captured. The misorientation and geometrically necessary dislocation (GND) density induced by fretting fatigue were quantified by electron back-scattered diffraction (EBSD). The significant correlation between crack path, slip trace, grain boundary microstructure and GND density was revealed. The EBSD analysis achieved good agreement with the in-situ SEM observation.

引用

页数：12

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