摘要
对8Cr4Mo4V航空轴承钢进行分级固溶处理,即在1000~1060℃的初级固溶处理和在1080~1100℃的二级固溶处理,并观察和测试其组织和硬度,研究了分级固溶温度的影响。结果表明,随着初级固溶温度的提高(二级固溶处理为1080℃×10 min),钢中未溶碳化物的体积分数从4.37%逐渐降低到3.43%,但是晶粒没有明显长大。随着二级固溶温度的提高(初级固溶处理为1060℃×30 min),未溶碳化物的体积分数从3.51%逐渐降低到2.84%,平均晶粒尺寸显著增大。当初级固溶温度较低或二级固溶温度较高时,8Cr4Mo4V钢的回火硬度较高。为了使8Cr4Mo4V钢具有高硬度同时避免晶粒粗化,初级固溶温度宜为1020~1050℃,二级固溶温度宜为1080~1090℃。对这种钢进行1020℃×20 min+1090℃×10 min固溶处理后,其平均晶粒尺寸为12.1μm,回火硬度为63.8 HRC,冲击吸收功为15.28 J,室温抗拉强度为2664.3 MPa。
The effect of graded solution treatments,i.e.a primary solution treatment at 1000~1060℃and a secondary solution treatment at 1080~1100℃,on the microstructure and hardness of the 8Cr4Mo4V aviation bearing steel was assessed by means of SEM,TEM and hardness tester.The results show that with the increase of the primary solution temperature from 1000℃to 1060℃(the secondary solution treatment was set at 1080℃×10 min),the volume fraction of undissolved carbides in the steel decreased from 4.37%to 3.43%,but the grain growth was not obvious.However,with the increase of secondary solution temperature from 1080℃to 1100℃(the primary solution treatment was set at 1060℃×30 min),the volume fraction of undissolved carbides gradually decreased from 3.51%to 2.84%,and the average grain size increased significantly.The tempered hardness of the steel can reach a high value when the primary solution temperature is low or the secondary solution temperature is high.In order to improve the hardness and prevent grain coarsening of the steel,the primary solution temperature within the range of 1020~1050℃is suitable,and the secondary solution temperature is suitable within 1080~1090℃.After being solution treated according to the specifications of 1020℃×20 min+1090℃×10 min,the average grain size of the steel is 12.1μm,the tempered hardness is 63.8 HRC,the impact absorption energy is 15.28 J,and the tensile strength of the steel is 2664.3 MPa.
作者
于兴福
王士杰
郑冬月
王全振
苏勇
赵文增
邢飞
YU Xingfu;WANG Shijie;ZHENG Dongyue;WANG Quanzhen;SU Yong;ZHAO Wenzeng;XING Fei(School of Mechanical Engineering,Shenyang University of Technology,Shenyang 110870,China;School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Shenyang Blower Group Co.Ltd.,Shenyang 110869,China;School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2022年第4期287-297,共11页
Chinese Journal of Materials Research
基金
兴辽英才计划(XLYC1902022)
辽宁省教育厅2021年度科学研究经费(LJKZ0113)。
关键词
金属材料
8Cr4Mo4V
高温轴承钢
分级固溶处理
力学性能
metallic materials
8Cr4Mo4V
high temperature bearing steel
graded solution treatment
mechanical property
