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Fatigue and Cycle Plastic Behavior of 316L Austenitic Stainless Steel Under Asymmetric Load |
Jian PENG1,2(),Yi GAO1,Qiao DAI2,3,Ying WANG1,Kaishang LI1 |
1. School of Mechanical Engineering, Changzhou University, Changzhou 213164, China 2. Jiangsu Key Laboratory of Green Process Equipment, Changzhou University, Changzhou 213164, China 3. School of Mechanical Engineering, Jiangsu University of Technology, Changzhou 213001, China |
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Cite this article:
Jian PENG,Yi GAO,Qiao DAI,Ying WANG,Kaishang LI. Fatigue and Cycle Plastic Behavior of 316L Austenitic Stainless Steel Under Asymmetric Load. Acta Metall Sin, 2019, 55(6): 773-782.
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Abstract Due to excellent mechanical property and corrosion resistance of 316L austenitic stainless steel, it is widely used in chemical industry, but its fatigue behavior under asymmetric cycle load is not well understood. In this work, the fatigue and cyclic plastic deformation behavior of 316L austenitic stainless steel under asymmetric tensile-tensile cycle loading are studied, focusing on the variations of fatigue life, cycle plastic deformation and fracture mechanism with applied cycle load. The high and low stress regions can be clearly divided based on the differences of fatigue life, cyclic strain amplitude, mean strain, mean strain rate and failure strain. In the high stress region, mean strain, mean strain rate and failure strain are large, resulting in the significant cyclic plastic deformation, and the fatigue life is short. In the low stress region, the cyclic plastic deformation accumulation is limited, and the fatigue life is significantly increased. Through microstructural observations near fracture area and fracture surface analyses, the differences between large stress region and low stress region can be found. In the high stress region, a large number of voids are generated near the fracture surface, and the fracture surface is mainly featured by dimples. In contrast, in the low stress region, the fatigue crack is found near the fracture surface, and its propagation direction is perpendicular to the loading direction. The fatigue crack initiation site, the fatigue crack propagation zone, transition zone and rapid fracture zone are found on the fracture surface. Results of fracture mechanism analyses suggest that, the high stress region of 316L austenitic stainless steel is the cyclic plastic deformation dominant region, and the failure mechanism is the ductile failure caused by the accumulation of cyclic plastic deformation; while the low stress region is the fatigue dominant zone, and the failure mechanism is the fatigue crack propagation failure.
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Received: 16 August 2018
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Fund: National Natural Science Foundation of China(Nos.51805230);National Natural Science Foundation of China(51505041);Natural Science Foundation of the Jiangsu Higher Education Institutions of China(No.16KJB460002) |
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