激光熔覆Ni-Cr-B-Si耐热疲劳合金的组织与性能  

Microstructure and properties of Ni-Cr-B-Si anti-thermal fatigue alloy prepared by laser cladding

作　　者：张伟[1,2] 石淑琴[1] 陈云祥[1] 郑炉玉[1] 

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]浙江大学计算机科学与技术博士后科研流动站,浙江杭州310027

出　　处：《金属热处理》2012年第5期103-106,共4页Heat Treatment of Metals

基　　金：浙江省教育厅科研项目(Y201120211);2010年浙江省高等学校优秀青年教师资助计划(2010299)

摘　　要：在H13压铸模具钢表面进行了激光熔覆Ni-Cr-B-Si耐热疲劳合金的试验研究,利用金相显微镜、扫描电镜、显微维氏硬度计等仪器检测了熔覆层的组织和性能。结果表明,激光熔覆可以得到晶粒超细化、硬度高,与基体结合牢固的表面熔覆层。熔覆层组织为Ni基多元固溶体+碳化物(碳化铬、碳化钨、渗碳体),熔覆层平均硬度约732 HV0.2,平均厚度1.5 mm,与基体相比,其耐热疲劳性能提高112%,可显著提高合金压铸模的使用寿命。Experiment of laser cladding Ni-Cr-B-Si alloy powder was carried out on the surface of H13 steel, and microstructure and property of the laser clad layer were investigated. The experiment and test results show that the laser clad layer has preferable properties with fine crystals, higher hardness and good metallurgical bonding with base metal. Microstructure of the cladding is Ni-base multicomponent solid solution and carbides of Cr, Fe and W. The average hardness of the cladding is about 732 HV0.2 with thickness of 1.5 ram. Compared with H13 steel, the thermal fatigue resistance of the cladding can increase 112% ,which can obviously improve service life of die cast dies.

关 键 词：激光熔覆 Ni-Cr-B-Si合金 显微组织 硬度 热疲劳 

分 类 号：TG156.99[金属学及工艺—热处理] TG174.44[金属学及工艺—金属学]