采用室温拉伸实验并结合SEM、TEM、XRD以及X射线应力仪原位测定技术,研究不同TRIP处理条件下的高强度TRIP钢的力学性能与显微组织.结果表明,当两相区处理为800 ℃×3 min贝氏体区处理为400℃×5 min时,试验钢的抗拉强度可达975.68 MPa,伸长率为27.88％,强塑积可达27202 MPa％;在外加应力作用下,TRIP钢中残留奥氏体在屈服点之后发生向马氏体的转变,残留奥氏体向马氏体的转变为应变诱发相变;同时,残留奥氏体随应变增大而降低的趋势减缓,其强塑性越好,残留奥氏体发生向马氏体的渐进式转变使其TRIP效应更为显著;此外,试验钢中残留奥氏体多呈薄膜状,具有较好的强塑性.
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