应用CCT-AY-Ⅱ型钢板连续退火机、X射线衍射、扫描和透射电镜、EBSD和拉伸试验等研究了TRIP钢(0.2C-1.5Si-2Mn-0.43Cu-0.26Ni)贝氏体区(350 ～ 470℃)等温处理对组织和性能的影响.结果表明:在贝氏体等温温度为410℃时,TRIP钢综合力学性能最佳,抗拉强度达到1088 MPa,伸长率16.88％,强塑积18365 MPa·％.残留奥氏体在TRIP钢中存在的形态有粗大块状、薄膜状和细小粒状.其中薄膜状的残留奥氏体属于亚稳奥氏体,形变过程中发生渐进式转变,极大地发挥TRIP效应.残留奥氏体中的碳含量和薄膜厚度是决定残留奥氏体稳定性的关键因素.
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