文献类型：期刊文献

英文题名：Fatigue behaviors of 2205 duplex stainless steel with gradient nanostructured surface layer

作者：Liu, Yi-Xin[1];Chen, Hao[1];Wang, Run-Zi[1];Jia, Yun-Fei[1];Zhang, Xian-Cheng[1];Cui, Yan[2];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Meilong Rd 130, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Adv Mat & Feringa Nobel Prize Scientist J, Inst Fine Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2021

卷号：147

外文期刊名：INTERNATIONAL JOURNAL OF FATIGUE

收录：;EI(收录号：20210809968643);WOS:【SCI-EXPANDED(收录号:WOS:000636070400004)】；

基金：This work was supported financially by the National Key Research and Development Program of China (2018YFC1902404), the National Natural Science Foundation of China (Nos. 51725503, 52005186, 52005185 and 51975214) and 111 Project. Zhang XC is also grateful for the Innovation Program of Shanghai Municipal Education Commission (2019-01-07-00-02-E00068).

语种：英文

外文关键词：Gradient nanostructure; 2205 duplex stainless steel; Fatigue; Martensite phase transformation

摘要：Fatigue behaviors of 2205 duplex stainless steel (initially composed of austenite and ferrite phase) with a gradient nanostructured (GNS) surface layer induced by the ultrasonic rolling process (USRP), are investigated in both strain-controlled high-cycle fatigue (HCF) and low-cycle fatigue (LCF) tests. Results showed that the fatigue life is improved in HCF (-5 times longer under 0.3% strain) but decreased in LCF (-53% under 0.8% strain). This is different from the simultaneous enhancement of fatigue behaviors in both HCF and LCF in other materials with GNS. The effect of martensite phase transformation (MPT), residual compressive stress as well as the GNS layers have been investigated to clarify the mechanisms of the fatigue behavior of the USRP samples. Besides the suppression of the surface crack initiation and propagation by residual compressive stress and GNS layers, the MPT during the USRP and cyclic loading processes greatly affects the fatigue behaviors. For HCF tests, not only the hard-brittle martensite phase induced by the USRP process improved the material strength but also the MPT process during cyclic loading absorbed the strain energy released from the crack growth, which increased the HCF life. However, for LCF tests, the hard-brittle martensite phase decreased the ductility of the GNS layer and accelerated the crack growth rate under higher strain amplitude, resulting in the decrement of LCF life. This work presents the first investigation on fatigue behaviors of duplex stainless steel with GNS structure.