摘要
本文采用1.5kW CO_2激光加工系统和自制的粉末喂给装置进行低碳钢激光表面合金化SiC 的处理,获得具有 C 1.25～2.46及 Si 3.63～7.19(wt%)成份的细小的凝固组织,其硬度可达900～1160HV。用光镜、扫描电镜、电子探针、离子探针、透射电镜、显微硬度计等手段分析了合金化区域的成份、组织、性能及其关系,并探讨了凝固机理与硬化机理。
An investigation of the laser surface alloying of mild steelcontaining C 0.18wt% with SiC powder,by means of a 1.5kW CO_2 lasersystem and powder feeder system which was designed and made by ourself isreported.The compositions of solidified structures in the range of C 1.25-2.46wt% and Si 3.63-7.19wt%.The hardness values of the fine solidified struc-ture are in the range of 900～1160HV.By means of optical microscope,SEMwith EPMA system,TEM,ion probe system and microhardness tester,thecompositions,structures and properties of the alloyed zone were determined.The relationships between them are established.Also,the mechanisms ofsolidification and hardening are discussed.
关键词
低碳钢
激光
表面合金化
碳化硅
laser surface aloying
mild steel
soldified structure
