热处理工艺对离心铸造高铬铸铁轧辊组织及硬度的影响  

Effect of heat treatment process on microstructure and hardness of high chromium cast iron roller produced by centrifuge casting

作　　者：曹宇[1] 宋新莉[1] 郑爱琴 陈荣东 贾涓[1] 毕云杰 Cao Yu;Song Xinli;Zhen Aiqin;Chen Rongdong;Jia Juan;Bi Yunjie(State Key Laboratory of Refractory Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan Hubei 430081,China)

机构地区：[1]武汉科技大学耐火材料与冶金国家重点实验室,武汉湖北430081

出　　处：《金属热处理》2020年第2期108-113,共6页Heat Treatment of Metals

基　　金：国家重点研发计划(2017YFB0305100)。

摘　　要：采用了光学显微镜、扫描电镜、X射线衍射仪、洛氏硬度计等仪器,研究了离心铸造高铬铸铁轧辊铸态及淬火与回火后的显微组织结构、碳化物和硬度等。结果表明:高铬铸铁轧辊铸态组织主要是由奥氏体+少量马氏体+(Cr,Fe)7C3碳化物组成,碳化物呈粗大板条状或块状;不同温度热处理后,得到回火马氏体+(Cr,Fe)7C3+Cr7C3碳化物的组织,组织中粗大板条状碳化物消失,得到细小块状或椭圆状碳化物。该高铬铸铁轧辊铸态硬度为56. 0 HRC左右,在950℃淬火及400℃回火处理后硬度增加到了约65. 5 HRC。Microstructure,carbides and hardness of high chromium cast iron roller as-cast by centrifuge casting and quenched and tempered were studied by optical microscope,scanning electron microscope,X-ray diffractometer and Rockwell hardness tester. The results show that the microstructure of the roller as cast is mainly composed of austenite and a few martensite and coarse plate or blocky( Cr,Fe)7C3 carbide.After heat treatment at different temperatures,tempered martensite and( Cr,Fe)7C3 and Cr7C3 carbides are obtained,and the plate-like carbides are replaced by fine block or elliptical ones. The hardness of the as-cast high chromium roller is 56. 0 HRC,then increases to about 65. 5 HRC after 950 ℃ quenching + 400 ℃ tempering.

关 键 词：高铬铸铁轧辊 热处理 碳化物 硬度 

分 类 号：TG143.1[一般工业技术—材料科学与工程]