高碳合金钢75Cr1高温变形后相和组织的转变  

Transformation of Phases and Structure in Elevated-Temperature Deformed High Carbon Alloy Steel 75Cr1

作　　者：胡松涛[1] 余万华[2] 廉晓洁[1] 翟士斌 

机构地区：[1]太原钢铁(集团)有限公司技术中心,太原030003 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《特殊钢》2016年第1期57-59,共3页Special Steel

摘　　要：通过Gleeble-3800热模拟机将高碳合金钢75Cr1(/%:0.75C,0.27Si,0.85Mn,0.010P,0.003S,0.60Cr)在1090℃以15 s^(-1)进行第1道次25%压缩变形,以20℃/s冷却至880℃,20 s^(-1)进行第2道次25%压缩变形,再分别以0.05~45℃/s不同冷速冷却至室温,得出连续冷却转变(CCT)曲线和冷却速率对该钢相和组织的影响。结果表明,相变临界Ac_1和Ac_3分别为730℃和773℃;冷速低于1℃/s时钢的组织主要为先共析铁素体和细小珠光体,冷速在1~10℃/s时钢的组织为珠光体和贝氏体,冷速高于10℃/s时组织中会出现马氏体,马氏体会随着冷速的增加逐渐增多,当冷速大于18℃/s时,钢的组织以马氏体为主,含有极少量的贝氏体。The continuous cooling transformation（CCT） curves of high carbon alloy steel 75Cr1（/%：0.75 C,0.27 Si,0.85 Mn,0.010 P,0.003 S,0.60Cr） and the effect of cooling rate on phases and structure of steel are obtained by Gleeble-3800 thermal simulation testing machine to carry out first reduction 25%deformation with deformation rate 15 s^（-1）at 1 090 ℃ then with 20℃/s cooling to 880 ℃ and second reduction 25%with deformation rate 20 s^（-1） then with 0.05 ~45 ℃/s cooling to ambient temperature.Results show that the critical points of phase transformation Ac_1 and Ac_3 are respectively 730 ℃ and 773 ℃;with cooling rate being lower than 1 ℃/s the main structure of steel is proeutectoid ferrite and fine pearlite,with cooling rate being 1~10 ℃/s,the structure of steel is pearlite and bainite;with cooling rate being larger than 10 ℃/s the martensite occurs in structure and with increasing cooling rate the amount of martensite increases,and with cooling rate being larger than 18℃/s the main structure of steel is martensite and has minor bainite.

关 键 词：高碳合金钢75Cr1 热变形 相 组织 转变 

分 类 号：TG142.11[一般工业技术—材料科学与工程]