作　　者： ; ; ; ;

机构地区： 广东工业大学材料与能源学院

出　　处： 《金属热处理》 2012年第4期71-75,共5页

摘　　要： 采用OM、XRD、SEM和EDS以及硬度测试等方法对精密喷射成形HM1热作模具钢的微观组织、物相、元素分布及硬度等进行了分析,并与铸态材料进行了比较。结果表明,铸态组织为粗大的枝状晶,晶粒尺寸150～200μm,晶界处为粗大连续的网状碳化物组织;喷射态HM1钢为细小的等轴晶组织,晶粒尺寸20～50μm,晶界处弥散分布少量细小的先共析碳化物相,喷射态材料有效的消除了元素偏析和网状碳化物组织。对喷射态和铸态材料进行回火处理的研究表明,喷射态材料回火后具有比铸态材料回火后更高的硬度,其高温耐热性提高;在520℃回火2 h,喷射态硬度达52～54 HRC,铸态为50～51 HRC。 The microstructure,element distribution and hardness of both precision spray-formed and cast HM1 hot work tool steel were investigated by OM,XRD,SEM and EDS,etc.The results indicate that the microstructure of as cast alloy is coarse dendrite with large continues carbide network at grain boundaries,the grain size is 150-200 μm.And the as spray-formed steel is fine equiaxed grains with few scattered proeutectoid carbides and its grain size is 20-50 μm.So spray forming effectively eliminates element segregation and carbide networks.Hardness is measured after tempering of each specimens,the as spray-formed gets a higher Rockwell hardness than that of as cast.After tempering at 520 ℃ for 2 h,the hardness of spray-formed steel is 52-54 HRC,while cast steel is 50-51 HRC.

关 键 词： 精密喷射成形 热作模具钢 组织 硬度 回火

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺] [冶金工程] [冶金工程]