固溶热处理对发动机用Cr4Mo4V滚动轴承钢的组织和力学性能的影响

Effect of Solid Solution Treatment on Microstructure and Mechanical Property of Ball Bearing Steel Cr4Mo4V

采用扫描电镜、硬度和冲击韧性测定等手段分析Cr4Mo4V钢在不同固溶温度处理后的组织和力学性能。研究结果表明:随着固溶温度从1050℃上升到1095℃,Cr4Mo4V钢组织的平均晶粒尺寸会随之快速增大,增大幅度约30%。在1050℃与1065℃下等温淬火可以生成细小的贝氏体组织,以及没有完全溶解的、均匀分布的碳化物颗粒。随着固溶温度升高到1080℃与1095℃,贝氏体的尺寸开始不断变大,在钢基体中形成了非常粗大的贝氏体组织。当固溶温度从1050℃上升到1095℃时,其硬度从HRC60.4增大到了HRC64.3,其冲击功从162.2kJ.m^-2减小到了84.6kJ.m^-2。随固溶温度的上升,硬度表现出不断增大,冲击功不断减小。

The microstructure and mechanical properties of Cr4Mo4V steel treated at different solid solution tem peratures were observed by means of scanning electron microscope, hardness and im pact toughness analyses. The results show ed as the solid solution tem perature was increased from 1050℃ to 1095℃, the average grain size of Cr4Mo4V steel group was increased rapidly, with the increase rate of about 30%. At 1050℃ and 1065℃ isotherm al quenching can generate tiny bainite, with uniform distribution of not com pletely dissolved carbide particles. As the solid solution tem perature was increased to 1080 ℃ and 1095 ℃, the size of the bainite started to grow , form ing very thick bainite structure in the steel substrate. When the solid solution tem perature w as increased from 1050 ℃ to 1095 ℃, the hardness was increased from HRC 60.4 to 64.3 HRC, and the im pact work was decreased from 162.2 kJ/m^2 to 84.6 kJ/m^2 . With the increase of solid solution tem perature, the hardness was increased and the impact work was decreased continuously.