Metallurgical and Materials Transactions A ( IF 2.8 ) Pub Date : 2020-08-26 , DOI: 10.1007/s11661-020-05968-x Saurav Sunil , Rajeev Kapoor
The effect of strain rate on the stress–strain response and the austenite to strain-induced α′-martensite transformation of austenitic steel 304L was studied. Compression tests were carried out at room temperature in the strain rate range of 10−3 to 103 s−1 and the evolution of martensite was quantified using a ferritoscope. Higher strain rates resulted in lower strain-induced α′-martensite. Strain incremental tests were carried out at 1 s−1 to simulate isothermal tests and to delineate effect of adiabatic heating on the α′-martensite transformation. Strain rate change tests were also carried out to determine the effect of prior strain rate history on the strain-induced α′-martensite content. These experiments showed that apart from the effect of adiabatic heating at high strain rates on the α′-martensite content, there is an additional effect of strain rate. While the adiabatic heating effect could be based on the increase in stacking fault energy (reduction of stacking fault width) with temperature, the additional effect due to strain rate was explained based on the expected reduction in stacking fault width with increasing strain rate.
中文翻译:
应变速率对AISI 304L不锈钢中应变诱发马氏体形成的影响
研究了应变速率对奥氏体304L钢的应力应变响应和奥氏体对应变诱导的α'马氏体相变的影响。在室温下以10 -3至10 3 s -1的应变速率进行压缩测试,并使用铁素体镜对马氏体的演变进行定量。较高的应变速率导致较低的应变诱导的α'马氏体。应变增量测试在1 s -1进行模拟等温试验,并描述绝热加热对α'-马氏体转变的影响。还进行了应变率变化测试,以确定先前的应变率历史对应变诱导的α'马氏体含量的影响。这些实验表明,除了高应变速率的绝热加热对α'-马氏体含量的影响外,还有应变速率的其他影响。绝热加热效果可能是基于堆垛层错能量随温度的增加(堆垛层错宽度的减小)而产生的,但基于应变率的附加效应是基于堆垛层错宽度随应变率增加的预期减少而解释的。