残余奥氏体中的碳元素在TRIP钢变形前后的分布

Distribution of Carbon in Retained Austenite Before and After Deformation of TRIP Steel

利用TEM和EPMA对TRIP钢中残余奥氏体形貌以及碳元素的分配进行了研究,发现TRIP钢中的残余奥氏体以多种形态分布,且碳在残余奥氏体中的浓度显著高于其他两相中的浓度,此时残余奥氏体可以通过EPMA中的贫硅区表示;变形之后的残余奥氏体将会发生相变,通过TEM发现残余奥氏体在受到应力作用而发生相变之后转变为细小的立方马氏体,且由于碳原子来不及扩散,马氏体中的含碳量和奥氏体中的含碳量基本相同。

Retained austenite morphology and Carbon distribution in TRIP steel were studied by TEM and EPMA. The results showed that retained austenite in the matrix was of different morphology and the carbon concentration in austenite was higher than that in the phases of ferrite and bainite. The distribution of retained austenite could be represented by poor silicon zone in EPMA. Retained austenite would be transformed into cubic martensite after deformed, and the carbon concentration in austenite and martenite were the same.