张家豪,陈连生,高天洋,徐海卫,韩赟,李红斌,田亚强

• 1:华北理工大学冶金与能源学院
• 2:首钢京唐钢铁联合有限责任公司技术中心

摘要(Abstract)：

采用扫描电镜(SEM)、X射线衍射(XRD)和拉伸实验等研究了退火温度(750、770、790、810、830和850℃)对DP1180钢微观结构演变和力学性能的影响。结果表明：经不同温度退火处理后，DP1180钢显微组织主要由铁素体(F)和马氏体(M)组成。随着退火温度的升高，实验钢中的铁素体和马氏体晶粒尺寸增加，马氏体由岛状变为板条状，抗拉强度和伸长率先增加后降低，而屈服强度则逐渐下降。在试验参数范围内，退火温度为790℃和过时效温度为270℃时，实验钢的综合力学性能最佳，抗拉强度为1255 MPa,伸长率为11.39%,强塑积达到14.29 GPa·%。通过对DP1180钢进行不同变形量的拉伸试验，发现在拉伸过程中微裂纹主要萌生于F/M界面处，随着应变的增加，裂纹在铁素体基体内扩展，裂纹尺寸增加，拉伸后断口形貌既有韧窝区域，又有解理和准解理区域的混合特征区。

关键词(KeyWords)： DP1180钢;连退工艺;退火温度;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): 张家豪,陈连生,高天洋,徐海卫,韩赟,李红斌,田亚强

DOI: 10.13289/j.issn.1009-6264.2022-0409

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