许立雄,马瑞杰,张毅,金东浩,王兰兰

• 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)：

基于正交实验法研究了淬火过程中加热速率、保温温度、保温时间和冷却速率等参数对BS960E贝氏体高强钢显微组织和力学性能的影响。结果表明，淬火后BS960E钢的组织均为板条马氏体；通过正交实验法设计的淬火工艺获得最小平均晶粒尺寸的最优参数组合为：加热速率50℃/s、保温温度920℃及保温时间2 min;获得最大维氏硬度的最优参数组合为：加热速率50℃/s、保温温度1010℃、保温时间2 min及冷却速度100℃/s。通过增设对照实验组验证了正交实验法的正确性，正交实验设计的试样最小平均晶粒尺寸为6.36μm,马氏体板条群、马氏体板条块和马氏体板条分别为5.2μm、1.24μm和336.3 nm。正交实验设计的试样最大硬度为424.3 HV,马氏体板条群、马氏体板条块和马氏体板条分别为8.5μm、1.65μm和333.5 nm。相比于前者，后者在冷却速率相同(100℃/s)的情况下，由更高的温度(1010℃)降低至室温，产生了更大的过冷度，马氏体相变驱动力增加导致位错密度增加，大角度晶界占比由70.5%提高至83.3%,因此硬度更高。

关键词(KeyWords)： BS960E钢;正交实验法;原始奥氏体晶粒尺寸;板条马氏体;维氏硬度

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 许立雄,马瑞杰,张毅,金东浩,王兰兰

DOI: 10.13289/j.issn.1009-6264.2023-0299

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