相变诱发塑性的应力松弛机制及塑性增量计算方法

Stress Relaxation Mechanism and Calculation Method of TRIP Increment

根据Cr Ni系奥氏体不锈钢低温拉伸曲线的特点 ,提出了相变诱发塑性的应力松弛机制及诱发塑性增量定量表征参量F(ε)。利用应力松弛机制得到的相变诱发塑性增量F(ε)随应变的增加基本保持为恒定值 ,约等于0 19。此值与按相变前后最大均匀应变得到的平均塑性增量的量化指标D =0 2 0非常接近。

A mechanism of stress relaxation and its quantitative parameter F(ε) of transformation-induced plasticity (TRIP) increment was proposed basing on characteristics of the tensile curve of metastable austenite stainless steel. TRIP increment F(ε) obtained using stress relaxation mechanism keeps a constant 0.19 with increasing strain, and this value approaches the quantitative parameter D using method of ultimate uniform strain of austenite and martensite.