摘要
利用DIL805L淬火相变膨胀仪研究了齿轮钢16MnCr的过冷奥氏体连续冷却转变行为，结合金相一硬度法，绘制静态CCT曲线。结果表明：试验钢在冷速小于0．2℃／s时，室温下获得铁素体＋珠光体组织，冷速大于0．5℃／s，室温下试验钢中出现贝氏体组织，冷速大于5℃／s，试验钢中出现马氏体组织；随着冷速的增加，铁素体、珠光体减少，铁素体的形态由多边形向针状发展，硬度由146HV30增大至380HV30。由于Mo推迟了铁素体、珠光体转变，降低了获得铁素体的临界冷速，试验钢获得铁素体＋珠光体组织的冷速范围较窄。
The continuous cooling transformation behavior of gear steel 16MnCr was studied on the DILSO5L thermal dilatometer combined with metallographic method and hardness measurement. The results show that there are ferrite and pearlite in the tested steel below the cooling rate of 0.2 ℃/s. Bainite appears when the cooling rate is above 0.5 ℃/s, and when the cooling rate is more than 5 ℃/s, martensite appears in the tested steel. The higher the cooling rates, the less the quantities of ferrite and pearlite, the values of the micro harness increase from 146 HV30 to 380 HV30. Meanwhile the morphology of ferrite changes from polygonal to acicular. Molybdenum can delay the transformation of ferrite/pearlite and lower the critical cooling rate, thus narrowing the range of the cooling rate of ferrite and pearlite.
作者
孟延军
孙岩
安治国
李建朝
刘宏强
Meng Yanjun;Sun Yan;An Zhiguo;Li Jianchao;Liu Hongqiang(Hebei College of Industry and Technology, Shijiazhuang Hebei 050091, China;Steel Research Institute, Hesteel Group, Shijiazhuang Hebei 050000, China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第4期102-105,共4页
Heat Treatment of Metals
