周澍,张柯,顾剑锋,戎咏华

• 1:上海市激光制造与材料改性重点实验室
• 2:上海交通大学材料科学与工程学院

摘要(Abstract)：

Fe-0.25C-1.5Mn-1.2Si-1.5Ni-0.05Nb(质量分数,%)钢通过淬火-碳分配-回火(Q-P-T)工艺抗拉强度可达1250 MPa以上兼具良好塑性(大于17%),显微组织为位错型板条马氏体、微合金碳化物和薄片状残留奥氏体。通过低温拉伸试验分析了Q-P-T钢在-85～25℃下的力学性能并采用透射电镜观察了试样在25℃和-85℃时拉伸前后的显微组织。结果表明,Q-P-T钢在-70～25℃时显示了良好的低温力学性能,仅当拉伸温度低于-70℃时试样塑性开始出现大幅下降;残留奥氏体在未变形前具有良好的低温稳定性,但在变形过程中会发生马氏体相变,产生相变诱发塑性(TRIP)效应,这是Q-P-T钢具有高强度和良好塑性的主要原因。

关键词(KeyWords)： 淬火-碳分配-回火(Q-P-T)工艺;残留奥氏体;TRIP效应;碳化物;马氏体

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金重点项目(51031001)

作者(Author): 周澍,张柯,顾剑锋,戎咏华

DOI: 10.13289/j.issn.1009-6264.2012.06.009

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