稀土变质铸造对机加工刀具用W6Mo5Cr4V2钢微观组织的影响  

Effect of Rare Earth Modification Casting on Microstructure of W6Mo5Cr4V2 Steel for Machining Tools

作　　者：丁雨 于吉鲲 DING Yu;YU Jikun(Applied Technology College,Dalian Ocean University,Dalian 116023,China)

机构地区：[1]大连海洋大学应用技术学院,辽宁大连116023

出　　处：《热加工工艺》2022年第23期15-18,共4页Hot Working Technology

基　　金：辽宁省博士科研启动基金计划项目(2021-BS-237);辽宁省教育厅科学研究经费项目(QL202017,QL201914);辽宁省普通高等教育本科教学改革研究优质教学资源建设与共享项目(596);辽宁省职业技术教育学会科研规划项目课题(LZY20065);大连海洋大学科技创新团队资助项目(2021);大连海洋大学第二届“湛蓝学者工程”资助项目(191022007)。

摘　　要：采用OM、SEM等研究了0.02wt%~0.06wt%添加量的Ce/La复合稀土(Ce含量70wt%,La含量30wt%)变质处理对W6Mo5Cr4V2高速钢铸态组织的影响。结果表明:未变质的W6Mo5Cr4V2钢枝晶较为发达,晶界处有大量网状碳化物分布。经Ce/La复合稀土变质后,钢的铸态组织中二次枝晶间距有所减小,网状碳化物被打断,碳化物得到细化。与未变质钢相比,添加0.04%Ce/La稀土的高速钢二次枝晶间距减小了14.5%,碳化物网状结构基本断开,面积百分比减少了33.7%,变质效果最佳。The effect of 0.02wt%-0.06wt% added Ce/La composite rare earth(Ce 70wt%, La 30wt%) modification on the as-cast microstructure of W6Mo5Cr4V2 high speed steel was studied by OM and SEM. The results show that the dendrites of unmodified W6Mo5Cr4V2 steel are well grown, and there are a lot of carbides distributed along grain boundaries. After Ce/La composite rare earth modification, the secondary dendrite spacing in the as-cast microstructure of the steel decreases, the network carbide is interrupted, and the carbide is refined. Compared with those of unmodified the steel, the secondary dendrite spacing of the high speed steel with 0.04% Ce/La rare earth is reduced by 14.5%, the carbide network structure is basically broken, the area percentage is reduced by 33.7%, and the modification effect is the best.

关 键 词：W6MO5CR4V2钢 稀土 变质处理 组织 碳化物 

分 类 号：TG243[金属学及工艺—铸造] TG142.45[一般工业技术—材料科学与工程]