摘要
采用DIL805L淬火变形膨胀仪,并结合金相-硬度法,绘制了一种轴承钢GCr15Si Mn的连续冷却转变（CCT）曲线。结果表明：试验钢在连续冷却过程中存在珠光体、马氏体和二次碳化物,当冷速小于8℃/s时,室温得到全部珠光体组织,大于15℃/s时,室温得到全部马氏体组织,介于两者之间是珠光体和马氏体的混合组织;随着冷速的增大,网状碳化物数量减少,且出现半网状的趋势,当冷速达到20℃/s时,网状碳化物基本消失;硬度值随着冷速的增大而增大。
Continuous cooling transformation curves of a bearing steel GCr15 Si Mn were obtained on a DIL805 L thermal dilatometer combined with metallographic method and hardness measurement. The results show that the microstructures are pearlite,martensite and secondary carbide under different cooling rates. When the cooling rate is less than 8 ℃/s,the microstructure is all pearlite at room temperature. When the cooling rate is more than 15 ℃/s,the microstructure is all martensite at room temperature. When the cooling rate is between 8 ℃/s and15 ℃/s,the microstructure is a mixture of pearlite and martensite. With the increase of cooling rate,the number of network carbides decreases,with the carbides trending to be half-netted. When the cooling rate reaches 20 ℃/s,the network carbide disappears basically. As the cooling rate increases,the hardness increases.
作者
孙岩
赵亮
安治国
刘德义
戴观文
Sun Yan;Zhao Liang;An Zhiguo;Liu Deyi;Dai Guanwen(Steel Research Institute, Hesteel Group, Shijiazhuang Hebei 050000, China;Technique Center, Shijiazhuang Iron and Steel Company, Hesteel Group, Shijiazhuang Hebei 050031, China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第6期24-27,共4页
Heat Treatment of Metals
关键词
GCr15SiMn轴承钢
连续冷却转变
组织
硬度
GCr15SiMn hearing steel
continuous cooling transformation
microstructure
hardness
