文献类型：期刊文献

英文题名：Micro-deformation evolutions of the constituent phases in duplex stainless steel during cyclic nanoindentation

作者：Cui, Yuan-Yuan[1];Jia, Yun-Fei[1];Xuan, Fu-Zhen[1]

机构：[1]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：8

外文期刊名：SCIENTIFIC REPORTS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000430282200007)】；

基金：This work was supported by National Natural Science Foundations of China (51605164), Shanghai Sailing Program (16YF1402300), Shanghai Chenguang Program (16CG34), the Fundamental Research Funds for the Central Universities (222201718005).

语种：英文

摘要：Cyclic elastoplastic deformation behaviors of austenite phase and ferrite phase in a duplex stainless steel were investigate by load-controlled cyclic nanoindentation with a Berkovich indenter. During the tests, the maximum penetration depth per cycle increased rapidly with cycle number at transient state, and reached stable at quasi-steady state. Plastic dissipated energy was quantitatively proved to be the driving force for the propagation of deformation zones during cyclic nanoindentation tests. Transmission electron microscopy combined with FIB was used to reveal the deformation mechanisms of both phases underneath indents with cycles. After quasi-static single loading, nucleation and concentration of dislocations were observed in both austenite phase and ferrite phase under the indenter. After cyclic loading, dislocations propagated to further regions in both phases. Besides, slip bands were generated within single nanoindentation and propagated during the subsequent cyclic nanoindentation. The sizes of the deformation regions for both phases under the indents after cyclic indentation observed by TEM were consistent with those calculated by the expansion model of spherical cavity.