Cr3C2对Cr12钢光纤激光铁基熔覆层组织与硬度的影响  

Effects of Cr3C2 on Microstructure and Microhardness of Iron-based Cladding Layer by Fiber Laser on Cr12 Steel

作　　者：何力佳[1] 王文峰[1] 王函[1] 孙晓帮[2] HE Lijia;WANG Wenfeng;WANG Han;SUN Xiaobang(School of Material Science and Engineering,Liaoning University of Technology,Jinzhou 121001,China;College of Automotive and Traffic Engineering,Liaoning University of Technology,J inzhou 121001,China)

机构地区：[1]辽宁工业大学材料科学与工程学院,辽宁锦州121001 [2]辽宁工业大学汽车与交通工程学院,辽宁锦州121001

出　　处：《热加工工艺》2018年第20期129-131,135,共4页Hot Working Technology

基　　金：辽宁省自然科学基金项目(20170540432);辽宁省教育厅高等学校重大科技平台科学技术研究项目(JP2016006);辽宁工业大学校企技术开发项目(XM201605025-B14033381)

摘　　要：以Cr12冷作模具钢为基材,采用光纤激光在其表面熔覆铁基合金粉末。研究了Cr3C2含量对激光熔覆层组织和性能的影响。结果表明,Cr3C2/Fe基激光熔覆层的相组成主要为Ni-Cr-Fe、Cr3C2、Cr7C3、Cr（23）C6、[Fe,Ni]等相。加入Cr3C2可提高该熔覆层的显微硬度。随着Cr3C2含量的增加,熔覆层组织逐渐细化。晶粒的形貌由粗大的树枝晶过渡到细小块状和圆钝化的树枝晶。Taking Cr12 cold work die steel as matrix,Fe-based alloy powder was cladded on the surface of Cr12 steel.The effects of Cr3C2content on the microstructure and microhardness of the laser cladding layer were studied.The results show that the phases are composed of Ni-Cr-Fe,Cr3C2,Cr7C3,Cr（23）C6andγ-[Fe,Ni].With the addition of Cr3C2,the hardness of the cladding layer increases,and with the increase of Cr3C2content,the microstructure of the cladding layer gradually refines.The morphology of grain changes from coarse dendrite to fined block shape and round passivation dendrite.

关 键 词：激光熔覆 铁基粉末 微观组织 

分 类 号：TG174.44[金属学及工艺—金属表面处理]