余伟,陈银莉,徐立善,蔡庆伍

• 1:北京科技大学高效轧制国家工程研究中心

摘要(Abstract)：

采用一种中碳低合金高强度钢,在轧后进行直接淬火后再快速升温至400～600℃进行碳分配处理的直接淬火-碳分配(Quenching Partitioning)处理(DQP),研究DQP工艺对钢的组织与力学性能的影响。利用扫描电镜和透射电镜观察组织及析出物的变化,采用X射线衍射仪分析了钢中残留奥氏体体积分数。结果表明:DQP处理后,钢的组织为板条马氏体组织和残留奥氏体。马氏体板条宽150～250 nm;残留奥氏体位于马氏体板条间,随工艺参数不同,其体积分数在4%～8%。钢中析出物尺寸大多为20 nm左右。经过DQP处理后,钢的抗拉强度达到1200 MPa以上,伸长率15%～17%。-40℃冲击功达到30 J以上。合理的淬火终淬温度可以获得更多残留奥氏体,而升高分配温度会增加析出、并使析出物长大,这是提高钢的强度和韧性的主要原因。

关键词(KeyWords)： 淬火;碳分配;组织;力学性能;析出;残留奥氏体

Abstract:

Keywords:

基金项目(Foundation): 国家“十一五”科技支撑计划资助项目(2006BAE03A06)

作者(Author): 余伟,陈银莉,徐立善,蔡庆伍

DOI: 10.13289/j.issn.1009-6264.2012.04.015

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