外加磁场对离心铸造高速钢轧辊组织和性能的影响  

Effect of external magnetic field on the microstructure and properties of high-speed steel roller by centrifugal casting

作　　者：范永祥[1] 李丘林[2] 张晓丹[1] 宋亮[1] 刘伟[1] 

机构地区：[1]清华大学材料科学与工程系,北京100084 [2]清华大学深圳研究生院,广东深圳518055

出　　处：《金属热处理》2008年第7期20-23,共4页Heat Treatment of Metals

基　　金：国家科技部“863”计划重大项目(2003AA331050)

摘　　要：为改善高速钢轧辊的凝固组织以提高其使用性能,在离心铸造过程中引入磁场,研究了不同磁场强度对高速钢轧辊凝固组织的影响。结果表明,施加磁场后,高速钢轧辊凝固组织中残留的奥氏体含量降低;随着磁场强度的增加,凝固组织中共晶碳化物断网倾向增强,碳化物的类型也发生改变,其硬度值不断增大;当磁场强度达到0.15T时,轧辊组织中的碳化物类型为M7C3、M2C和MC,MC型碳化物细小弥散,共晶碳化物断网情况最为理想,维氏硬度值最大。External magnetic field was introduced to improve the microstructure of the centrifugal casting high-speed steel （HSS） rollers. The effect of external magnetic field on the microstructure of centrifugal casting HSS rollers was studied. The results show that the volume fraction of residual austenite in the HSS rollers decreased after introducing external magnetic field. With the magnetic intensity increasing, the formation of eutectic network-like carbides was restrained and the type of the carbides in the HSS rollers was changed, and the vicker hardness values of HSS rollers increased gradually. When the external magnetic intensity reached 0.15 T, the types of the carbides in the HSS roller are fine and dispers ed M7 Ca, M2 C and MC. There is no network-like eutectic carbides,and the vicker hardness is the highest.

关 键 词：高速钢轧辊 离心铸造 磁场 碳化物 

分 类 号：TG333.17[金属学及工艺—金属压力加工] TG161.8