Atomic-Scale Insights into Damage Mechanisms of GGr15 Bearing Steel Under Cyclic Shear Fatigue

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外文摘要：Alternating shear stress is a critical factor in the accumulation of damage during rolling contact fatigue,severely limiting the service life of bearings.However,the specific mechanisms responsible for the cyclic shear fatigue damage in bearing steel have not been fully understood.Here the mechanical response and microstructural evolution of a model GGr15 bearing steel under cyclic shear loading are investigated through the implementation of molecular dynamics simulations.The samples undergo 30 cycles under three different loading conditions with strains of 6.2％,9.2％,and 12.2％,respectively.The findings indicate that severe cyclic shear deformation results in early cyclic softening and significant accumulation of plastic dam-age in the bearing steel.Besides,samples subjected to higher strain-controlled loading exhibit higher plastic strain energy and shorter fatigue life.Additionally,strain localization is identified as the predominant damage mechanism in cyclic shear fatigue of the bearing steel,which accumulates and ultimately results in fatigue failure.Furthermore,simulation results also revealed the microstructural reasons for the strain localization(e.g.,BCC phase transformation into FCC and HCP phase),which well explained the formation of white etching areas.This study provides fresh atomic-scale insights into the mecha-nisms of cyclic shear fatigue damage in bearing steels.

外文关键词：

Cyclic shear fatigueMolecular dynamic simulationBearing steelsPlastic damage accumulation

作者：

Qiao-Sheng Xia、Dong-Peng Hua、Qing Zhou、Ye-Ran Shi、Xiang-Tao Deng、Kai-Ju Lu、Hai-Feng Wang、Xiu-Bing Liang、Zhao-Dong Wang

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作者单位：

State Key Laboratory of Solidification Processing,Center of Advanced Lubrication and Seal Materials,Northwestern Polytechnical University,Xi'an 710072,China

State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China

Defense Innovation Institute,Academy of Military Science,Beijing 100071,China

基金：

Natural Science Foundation of ChinaKey Research and Development Program of Shaanxi ProvinceOpen Fund of Liaoning Provincial Key Laboratory of Aeroengine Materials TribologyState Key Laboratory for Mechanical Behavior of MaterialsFundamental Research Funds for the Central Universities

项目编号：

521751882023-YBGY-434LKLAMTF20210120222412

出版年：

2024

DOI：

10.1007/s40195-024-01704-1

金属学报(英文版)

中国金属学会

金属学报(英文版)

CSTPCD

影响因子：0.77

ISSN：1006-7191

年,卷(期)：2024.37(7)