摘要
对8Cr4Mo4V轴承钢试样进行尺寸稳定处理,用扫描电镜观察不同阶段的组织,并测定热膨胀系数和升温期间的热流变化,分析相变的温度区间及其对尺寸变化的影响。结果表明:稳定处理过程中马氏体回火使尺寸减小,残余奥氏体转变使尺寸增大,马氏体分解使尺寸减小。一次稳定处理时,轴承钢中马氏体回火及马氏体分解占主导,导致尺寸减小;二次稳定处理时,残余奥氏体转变占主导,导致尺寸增大;三次稳定处理后,尺寸变化量较小,尺寸基本稳定。
The dimensional stability treatment is carried out for bearing steel 8Cr4Mo4V,and the microstructures are observed at different stages by SEM. The variations of thermal expansion coefficients and heat flux curves during heating up are determined,and the temperature interval of phase transformation and its influence on dimensional variation are analyzed. The results show that the martensite tempering and decomposition during stability treatment decreases dimension,the residual austenite transformation increases dimension. The martensite tempering and decomposition is predominant during first stability treatment,the dimension is decreased. The residual austenite transformation is predominant during second stability treatments,the dimension is increased. The dimensional variation amount is smaller after third stability treatments,and the dimension of bearing steel is basically stable.
作者
王松
夏云志
于兴福
赵开礼
马欣新
WANG Song;XIA Yunzhi;YU Xingfu;ZHAO Kaili;MA Xinxin(AECC Harbin Bearing Co.,Ltd.,Harbin 150500,China;School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China)
出处
《轴承》
北大核心
2019年第3期48-51,共4页
Bearing
基金
国家"八六三"计划(2015AA034303)
关键词
滚动轴承
8Cr4Mo4V钢
尺寸稳定处理
相变温度
尺寸变化
rolling bearing
steel 8Cr4Mo4V
dimensional stability treatment
phase transformation temperature
dimensional variation
