球墨铸铁表面激光亚微米陶瓷合金化  

Laser Alloying of Ductile Iron Surface Coated with Sub-Micron Ceramics

作　　者：徐晶[1,2] 王文焱[1,2] 谢敬佩[1,2] 马窦琴[1,2] 胡素梦[1,2] 丁宗业[1,2] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]河南省有色金属材料科学与加工技术重点实验室,河南洛阳471003

出　　处：《河南科技大学学报（自然科学版）》2009年第2期11-14,共4页Journal of Henan University of Science And Technology:Natural Science

基　　金：河南省教育厅自然科学基金项目(2007430003);河南科技大学科学研究基金项目(2007zy044);河南科技大学实验技术开发基金项目(sy0708053);河南科技大学大学生研究训练计划项目(2007008)

摘　　要：以亚微米级TiC和CrxCy合金混合粉末为原料,采用激光合金化技术在球铁表面制备出耐磨、耐腐蚀、耐高温的合金化层。利用XRD,SEM,EDS等分析了激光合金化层的相组成及微观组织,并测试了激光合金化层的显微硬度。结果表明,合金化层表面平整,与基体形成了冶金结合。在激光功率、光斑直径一定的条件下,在400～1000mm/min扫描速度范围内,合金化层厚度随扫描速度增加而减小,合金化层硬度随扫描速度增加而提高。激光合金化层中存在细晶强化和固溶强化等强化作用,大幅度地提高了球铁表面的显微硬度。The alloyed coating with wear resistance,corrosion resistance and high temperature resistance was prepared on the surface of ductile iron by laser alloying process,using the mixed ponder of sub-micron carbide TiC,CrxCy power as starting material.The microstructure of the laser alloying layer was characterized by XRD,SEM,EDS.The microhardness of the laser alloying layer was examined.The results revealed that the flat alloyed coating combines metallurgically with the substrate.Under conditions that the laser power and spot diameter remain unchanged,with in 400~1 000 mm/min scanning speed,the hardness of alloyed coating increases with increasing scanning speed.The alloyed coating is reinforced by solution and grain-refining,resulting in a remarkable increase in microhardness of ductile iron surface.

关 键 词：球墨铸铁 激光合金化 显微组织 显微硬度 

分 类 号：TG143.5[一般工业技术—材料科学与工程]