Microstructure and Properties of Metal-Ceramic Composite Coating by Laser Surface Alloying on 9CrSi Steel
Using sub-micron WC/Co metal ceramic composite as coating materials for laser alloying experiments to prepare high hardness and wear resistance alloyed layer on the surface of 9CrSi. The microstructures of laser-alloyed coating were detected by SEM and XRD. The microhardness and wear-resistance of the coatings were also investigated. The results indicate that,the laser alloyed layer and substrate form a good metallurgical bonding. The analysis of SEM reveal that the alloyed layer can be divided into alloyed zone,heat affected zone and substrate zone. The alloyed zone is composed by martensite,netted dendrite carbides and small carbide particles,the netted dendrite carbides distribute in the martensitic and the small carbide particles dispersed in the gap of the netted dendrite. The heat affected zone is consisted of retained austenite and martensite. There is no significant change in the matrix zone.The coating has a high hardness of 900HV0.2 ,and the abrasion loss of the alloyed coating is just one ninth of that of 9CrSi. The wear resisitance of the alloyed coating relative to the substrate 9CrSi has significantly improved.
laser alloying 9SiCr microstructure microhardness wear resisitance
Wen-yan Wang Xiao-ming Dong Jing-pei Xie Jing Xu Luo-li Li
Henan Key Laboratory of Advanced Non-ferrous Metals,Luoyang 471003,China Henan Key Laboratory of Advanced Non ferrous Metals,Luoyang 471003,China
国际会议
Frist Annual Meeting on Testing and Evaluation of Inorganic Materials(第一届全国无机材料测试与评价学术年会)
南昌
英文
643-646
2010-04-28（万方平台首次上网日期，不代表论文的发表时间）