马瑞杰,许立雄,周云根,金东浩

• 1:中冶南方工程技术有限公司
• 2:北京科技大学钢铁共性技术协同创新中心

摘要(Abstract)：

采用光学显微镜、扫描电镜、电子背散射衍射、能谱仪和X射线衍射等研究了回火时间对BS960E钢快速加热淬火后组织与性能的影响。结果表明：BS960E钢淬火后组织为板条状马氏体，其原始奥氏体平均晶粒尺寸为5.69μm,位错密度为4.02281×10~(15) cm~(-2)。随着回火时间的延长，马氏体板条结构逐渐分解；回火2 min时仍存在部分板条组织，有效晶粒尺寸(马氏体板条块)为2.47μm,位错密度急剧下降至9.48079×10~(14) cm~(-2);回火15和30 min时马氏体板条开始粗化，小角度晶界密度占比降低，此时有效晶粒尺寸分别为2.57和2.59μm,位错密度分别为7.80957×10~(14)和6.75406×10~(14) cm~(-2);回火60 min时，马氏体板条块合并明显，大角度晶界密度及占比下降，有效晶粒尺寸粗化达到2.99μm,位错密度降低至5.19655×10~(14) cm~(-2)。碳化物的析出位置可分为原始奥氏体晶界析出、马氏体板条块界析出和晶内析出3类。随着回火时间的延长，BS960E钢的抗拉强度和屈服强度逐渐减小，伸长率增加。回火时间达到60 min时由于析出的碳化物粗大导致伸长率降低。综合考虑BS960E钢经过快速加热淬火后，回火时间在2 min时综合力学性能最佳。

关键词(KeyWords)： BS960E钢;回火时间;有效晶粒尺寸;位错密度;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 马瑞杰,许立雄,周云根,金东浩

DOI: 10.13289/j.issn.1009-6264.2023-0350

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