In the past, it is experimentally revealed that the stacking fault energy (SFE) for the strain-induced martensitic transformation (SIMT) in metastable austenitic stainless steels is positively dependent on the strain rate, especially at impact strain rate; however, a conflicting view is recently reported that it is independent on the strain rate. To solve the conflict on the rate sensitivity of SFE, a non-destructive method to determine the martensitic volume fraction precisely under quasi-static tensile loading is effective and a method for measuring the relative magnetic permeability using AC voltage has been previously developed. However, this technique overestimates magnetic permeability during impact testing due to the eddy current generated at high frequencies, which can be avoided by applying DC voltage to the primary coil. In this work, quasi-static and impact tensile tests are performed on commercial SUS304 metastable austenitic stainless steel at various strain rates to determine its relative magnetic permeability during deformation. The obtained experimental data are utilized to investigate the SIMT behavior of SUS304 steel under quasi-static and impact tensions. As a result, it successfully captures the SIMT behavior in SUS304, especially during high strain rate deformation and the role of SFE on SIMT at higher strain rate is discussed.

过去的实验表明，亚稳态奥氏体不锈钢中的应变诱发马氏体相变（SIMT）的堆垛层错能（SFE）与应变率呈正相关，特别是在冲击应变率下。但是，最近报道了一种与应变率无关的观点。为了解决SFE的速率敏感性上的矛盾，在准静态拉伸载荷下精确地确定马氏体体积分数的无损方法是有效的，并且先前已经开发了使用交流电压测量相对磁导率的方法。但是，由于在高频下会产生涡流，因此该技术过高估计了冲击测试期间的磁导率，这可以通过向初级线圈施加直流电压来避免。在这项工作中 对商用SUS304亚稳态奥氏体不锈钢在各种应变速率下进行准静态和冲击拉伸测试，以确定其在变形过程中的相对磁导率。利用获得的实验数据来研究SUS304钢在准静态和冲击张力下的SIMT行为。结果，它成功地捕获了SUS304中的SIMT行为，尤其是在高应变率变形期间，并且讨论了SFE在较高应变率下对SIMT的作用。