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Increase of martensite start temperature after small deformation of austenite

机译：奥氏体小变形后马氏体起始温度升高

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摘要

It is generally considered that martensite start (Ms) temperature is decreased after plastic deformation of austenite if the previously applied load is retrieved. This can be explained by the dislocation stabilization mechanism. The present work performed systematic deformation and dilatometer experiments to investigate the effect of plastic deformation on Ms temperature. It is found that Ms temperature first increases at small strain and then decreases at large strain. Since the dislocation stabilization mechanism can only predict the decrease of Ms temperature after plastic deformation, a new mechanism is thus proposed to describe this new interesting finding. That is, the increase of Ms temperature is due to the pile-up of geometrically necessary dislocations at austenite grain boundaries, while the decrease of Ms temperature is caused by the formation of subgrains in austenite grain interior.
机译：通常认为，如果恢复了先前施加的载荷，则在奥氏体塑性变形后马氏体开始温度会降低。这可以通过位错稳定机制来解释。本工作进行了系统的变形和膨胀计实验，以研究塑性变形对Ms温度的影响。发现Ms温度在小应变时首先升高，然后在大应变时降低。由于位错稳定机制只能预测塑性变形后Ms温度的降低，因此提出了一种描述这种新的有趣发现的新机制。也就是说，Ms温度的升高是由于奥氏体晶界上几何学上必要的位错的堆积，而Ms温度的降低是由于在奥氏体晶粒内部形成了亚晶粒而引起的。

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