牟秀婷,陈其伟,潘红波,黄飞

• 1:安徽工业大学冶金工程学院
• 2:安徽工业大学冶金减排与资源综合利用教育部重点实验室

摘要(Abstract)：

针对目前热成形钢冲压过程中零部件局部强度较低与塑性较低问题,设计了2种不同Cr-Mn含量的微合金化热成形用钢。并采用热膨胀仪、光学显微镜、扫描电镜与硬度计等研究了实验钢的相变温度、组织演变与性能。结果表明:1号实验钢(0.27C-2.03Mn-0.12Si-1.5Cr-0.011Nb)的相变温度低于2号实验钢(0.21C-1.66Mn-1.21Cr-0.034Nb)。实验条件下1号实验钢的CCT曲线仅包含贝氏体与马氏体转变,在冷速为0.2℃/s时即发生马氏体转变。然而2号实验钢的CCT曲线包含铁素体、珠光体、贝氏体与马氏体转变,在冷速大于等于10℃/s时才发生全马氏体转变。1号实验钢有较宽的成形工艺范围,即使在冷速为1℃/s时,零部件强度也能达1500 MPa级,对模具设计要求低且具有较高的生产效率;而2号实验钢成形工艺相对较窄,成形后冷速需大于20℃/s其零部件强度才能达到1500 MPa。

关键词(KeyWords)： 热成形钢;CCT曲线;显微组织;合金元素;显微硬度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51774006,U1860105);; 安徽省科技重大专项(18030901085)

作者(Author): 牟秀婷,陈其伟,潘红波,黄飞

DOI: 10.13289/j.issn.1009-6264.2020-0026

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