陈连生,张家豪,刘麟,徐海卫,韩赟,杨子旋,李红斌,田亚强

• 1:华北理工大学教育部现代冶金技术重点实验室
• 2:首钢京唐钢铁联合有限责任公司技术中心
• 3:宁波大学冲击与安全工程教育部重点实验室

摘要(Abstract)：

采用扫描电镜(SEM)、X射线衍射(XRD)、电子探针(EPMA)等研究了连续退火均热时间(3、5、8和10 min)对Q&P980钢微观结构演变和力学性能的影响。结果表明：经过均热处理后，Q&P980显微组织主要由铁素体、块/板条状马氏体和少量残留奥氏体组成。随着均热时间的延长，试验钢的板条状马氏体比例升高；残留奥氏体含量先降低再升高，抗拉强度先升高后下降，伸长率与残留奥氏体含量变化趋势一致。均热时间的延长引起加工硬化指数(n)开始迅速升高，5 min后趋于平稳。当均热时间为5 min时，加工硬化指数为0.23,在此条件下，塑性变形过程中残留奥氏体有序、均匀地发生相变诱发塑性(TRIP)效应。均热保温时间初始阶段，Mn元素呈不均匀分布，富集效应明显；随着均热时间的延长，Mn元素分布趋于均匀化；然而，当均热时间为10 min时，Mn元素分布又呈现聚集状态。在试验参数范围内，均热时间为5 min时试验钢的性能最优，抗拉强度为1052.40 MPa,伸长率为22.92%,强塑积为24121.01 MPa·%;合理的均热时间范围为3～6.9 min。

关键词(KeyWords)： 连续退火;Q&P钢;元素分布;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 河北省科技厅重点研发计划项目(20311004D);; 河北省自然科学基金高端钢铁冶金联合基金项目(E2020209124,E2020209127,E2020209040);; 河北省自然科学基金重点项目(E2022209049)

作者(Author): 陈连生,张家豪,刘麟,徐海卫,韩赟,杨子旋,李红斌,田亚强

DOI: 10.13289/j.issn.1009-6264.2022-0225

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