采用扫描电镜(SEM)、X射线衍射仪、膨胀仪和MTS拉伸试验机等实验手段研究了热处理工艺对含V高强度TRIP钢组织和力学性能的影响.结果表明,该TRIP钢热处理后组织细小,细晶强化对机械性能的提高起到了一定作用.两相区退火温度越高,组织中铁素体含量越少,且贝氏体转变速率越快.随着贝氏体等温时间延长,组织中贝氏体量增多,马氏体量减少,残余奥氏体量及其碳含量呈现先增大后减小或趋于平稳的趋势.试验钢经800 ℃×3 min+400℃×3 min工艺处理后,可获得最大残余奥氏体量,体积分数达到20.6％,其碳含量为1.19 wt％,该工艺下试验钢可获得最佳力学性能,抗拉强度高达1 052 MPa,延伸率24％,强塑积达到25 248 MPa％.
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