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Microstructure variation and local plastic response of chrome molybdenum alloy steel after quasi rolling contact fatigue testing.pdf

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Microstructure variation and local plastic response of chrome molybdenum alloy steel after quasi rolling contact fatigue testing.pdf

Materials Science Engineering A 659 (2016) 37–46 Contents lists available at ScienceDirect Materials Science Engineering A journal homepage: /locate/msea Microstructure variation and local plastic response of chrome molybdenum alloy steel after quasi rolling contact fatigue testing Lechun Xie a,n, Qinghua Zhou b, Yan Wen c, Liqiang Wang a, Weijie Lu a a State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, PR China b School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, PR China c School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing, Jiangsu 210044, PR China article info Article history: Received 31 January 2016 Received in revised form 12 February 2016 Accepted 12 February 2016 Available online 13 February 2016 Keywords: Microstructure variation Local plastic response Finite element analysis Strain hardening exponent Quasi rolling contact fatigue abstract This work presented the microstructure variation and local plastic response of chrome molybdenum alloy steel under quasi rolling contact fatigue (quasi-RCF) testing. The quasi-RCF testing means using the similar method of actual RCF to introduce obviously local plastic deformation and microstructure variation on surface layers of materials. After quasi-RCF testing, the microstructure were observed using optical microscope and scanning electron microscope (SEM) from both the top surface and cross section. Based on microstructure analysis, the deformation volume of materials after quasi-RCF testing were calculated. The local plastic response was demonstrated by the unique local strain-stress curve and strain hardening exponent obtained via experimental measurements and simulation prediction. One hand, the increase in the hardness of plastic zones due to quasi-RCF testing was measured by a Vickers indenter. The other hand