冷却速率对45Mn2钢魏氏组织的影响  

Effect of Cooling Rate on Widmanstatten Microstructure of 45Mn2 Steel

作　　者：张磊[1,2] 赵勇桃[1] 霍文霞[3] 

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古包钢钢联股份有限公司无缝钢管厂159热轧部,内蒙古包头014010 [3]内蒙古科技大学分析测试中心,内蒙古包头014010

出　　处：《热加工工艺》2017年第12期228-231,共4页Hot Working Technology

基　　金：内蒙古科技大学基金资助项目(2015KYYQ02)

摘　　要：利用L78淬火膨胀仪测定了45Mn2钢在不同冷却速度下的组织转变,采用OLS4000激光共聚焦显微镜、QUANTA-400型环境扫描电子显微镜观察了组织,使用维氏硬度计测量了钢的硬度。结果表明:45Mn2钢在冷速10~20℃/s时,金相组织是铁素体+珠光体+魏氏组织;在30~50℃/s,金相组织是马氏体+魏氏体;在138℃/s时,组织是马氏体+贝氏体。随冷速增加,钢的硬度值增加。The microstructure transformation of 45Mn2 steel under different cooling rates was determined by L78 quenching expansion instrument. The microstrueture was observed using OLS4000 laser scanning confocal microscope and QUANTA-400 environment scanning electron microscope. Hardness of the steel was measured using a Vickers hardness tester. The results show that：during the cooling speed of 10-20 ℃/s, the microstructure of 45Mn2 steel is ferrite＋pearlite＋ widmanstatten; at 30-50℃/s, the microstructure is martensite ＋Widmanstatten; and at 138 ℃/s, the microstructure is martensite＋bainite. The hardness value of the steel increases with the increase of cooling rate.

关 键 词：冷却速度 45Mn2钢 魏氏组织 

分 类 号：TG142.15[一般工业技术—材料科学与工程]