摘要
利用激光熔覆和激光重熔的方法在低碳钢表面制备了原位生成颗粒增强铁基涂层.用X线衍射(XRD)、扫描电镜(SEM)对其相结构和微观组织进行了研究,重点分析了重熔层的组织形态和形成机制.结果表明:制备的涂层无气孔和裂纹,整个涂层的厚度为0.6～0.7 mm,重熔层厚度为50～80μm;熔覆层主要是方向比较紊乱的树枝晶组织,重熔层内形成了细小的等轴晶组织;重熔层最高显微硬度达到了1 056 HV.
Through the method of laser cladding and remelting,the in-situ particle reinforced Fe-based coating was prepared on the surface of the mild steel.The phase structure and microstructure were analyzed by XRD and SEM,a focus was laid on analyzing the microstructure and forming mechanism of remelted layer.The experimental results show that the coating was prepared without pores and cracks,the coating thinkness was about 0.6～0.7 m,the remelting coating thickness was about 50～80 μm,the microstructure of claddings are mainly fir-tree crystals of disordered directions and that of remelted layers are small equiax crystals,the highest microhardness in the remelted zone is up to 1 056 HV.
出处
《上海工程技术大学学报》
CAS
2010年第4期359-362,共4页
Journal of Shanghai University of Engineering Science
基金
上海市教委重点学科建设资助项目(J51402)
关键词
激光熔覆
显微组织
涂层
laser cladding
microstructure
coating
