化学成分和热处理工艺是影响TRIP钢力学性能的关键因素.通过热模拟试验方法研究了不同成分试验钢在临界区退火过程中的微观组织变化规律.结果表明:随着两相区退火温度的升高,铁素体平均晶粒尺寸逐渐减小,铁素体体积分数随着加热温度的升高而降低；残余奥氏体量和其中的C质量分数先随着退火温度的升高而降低,达到一个低谷以后,再随退火温度的升高而升高；在相同的退火温度下,随着Nb的加入,多边形铁素体晶粒尺寸细化,铁素体体积分数逐渐减少；既加Nb又高Si的试验钢钢中残奥数量最多,不加Nb的试验钢中残奥数量最少.TRIP钢试制结果表明,钢带组织类型为典型的TRIP钢组织,多边形铁素体平均晶粒尺寸约8μm,体积分数67％,残余奥氏体体积分数为5.58％,残余奥氏体中C质量分数为1.34％,同时,力学性能也完全满足TRIP590的性能要求.
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