激光堆焊F325合金粉/钼丝的组织与硬度研究  

The Research of Microstructure and Hardness of F325 Alloy Powder/Mo Wire after Laser Build-up Welding

作　　者：张伟[1,2,3] 郑炉玉 

机构地区：[1]浙江机电职业技术学院机械工程学院,浙江杭州310053 [2]宁波双林汽车部件股份有限公司,浙江宁海315613 [3]浙江大学博士后科研流动站,浙江杭州310027

出　　处：《应用激光》2013年第5期473-476,共4页Applied Laser

基　　金：浙江省博士后科研项目择优资助项目(项目编号:BSH1301011);2013年浙江省教育厅科研项目(项目编号:Y201328309);浙江省滑动轴承工程技术研究中心科研项目;浙江机电职业技术学院科研孵化基金资助项目(项目编号:A-0273-12-010)

摘　　要：为提高F325堆焊层的韧性,进行了激光堆焊F325与钼丝的实验。利用金相显微镜、维氏硬度仪等设备分析、测试了堆焊层的显微组织和硬度。研究表明:激光堆焊可以得到晶粒细化,组织致密,无裂纹、气孔等缺陷,与基体冶金结合的F325/钼丝复合材料覆层;钼丝外表面轻微熔化,与F325基体呈冶金结合;钼丝加入后,使其周边的晶粒大大细化,并抑制了碳化物的长大;钼丝与F325结合区的平均硬度为750HV0.2,高于F325堆焊层的平均硬度650HV0.2。In order to improve the toughness of F325 build-up welding layer, the experiments of laser build-up welding with the materials of F325 alloy powder and Mo wire were made. The microstructure and hardness of laser build-up welding layer were studied. The experiments showed that F325 and Mo wire composite cladding had better properties such as minute crystals, high density, no crack, no gas cavity and good metallurgical bonding with matrix. There was a slight melting on the surface of Mo wire which would greatly increase the binding force between F325 and Mo wire. Mo wire could make grain refine and limit the growing of carbide. The average hardness of Mo wire and F325 bonding zone was 750 HV0.2 which was higher than that of F325 build-up welding layer （650 HV0.2）.

关 键 词：激光堆焊 F325合金粉 堆焊层 组织 硬度 

分 类 号：TG156.99[金属学及工艺—热处理]