文献类型：期刊文献

英文题名：Gradient Elastic-Plastic Properties of Expanded Austenite Layer in 316L Stainless Steel

作者：Jiang, Yong[1,2];Li, Yang[1,2];Jia, Yun-Fei[3];Zhang, Xian-Cheng[3];Gong, Jian-Ming[1,2]

机构：[1]Nanjing Univ Technol, Sch Mech & Power Engn, Nanjing 211816, Jiangsu, Peoples R China;[2]Key Lab Design & Manufacture Extreme Pressure Equ, Nanjing 211816, Jiangsu, Peoples R China;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, MOE, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2018

卷号：31

期号：8

起止页码：831

外文期刊名：ACTA METALLURGICA SINICA-ENGLISH LETTERS

收录：;EI(收录号：20182705391030);WOS:【SCI-EXPANDED(收录号:WOS:000436510100006)】；

基金：The work is supported financially by the National Natural Science Foundation of China (Nos. 51475224 and 51605164) and the Natural Science Foundation of Jiangsu Higher Education Institutions of China (No. 14KJA470002).

语种：英文

外文关键词：Low-temperature gaseous carburization; Expanded austenite; Nanoindentation; Gradient elastic-plastic properties; Four-point bending

摘要：The gradient mechanical properties, variation of stress with strain and surface cracking behavior of expanded austenite developed on 316L austenitic stainless steel were investigated by nanoindentation tests, X-ray residual stress analysis and scanning electron microscope observation in four-point bending tests. The results show that the plastic properties of the carburizing layer including true initial yield strengths and strain hardening exponents increase significantly from substrate to surface, while the true elastic modulus just improves slightly. Due to the onset of plastic flow, the residual stresses are almost equivalent to the true initial yield strengths from surface to the depth of similar to 10 vim. The results of four-point bending tests show that surface stress increases linearly with the increase in strain until the strain reaches similar to 1.0%, after that the plastic yield happens. The expanded austenite surface layer is brittle, and the cracks will be created at the strain of similar to 1.4%. The cracking stress is about similar to 2.4 GPa.