无粘结铺粉式连续移动感应熔覆工艺试验及熔覆层性能分析

Continual induction cladding process test with no binder spread powder feeding and properties of clad layer

针对感应熔覆工艺流程复杂,需要对基体材料和涂层在200℃的条件下加热烘干并保温2 h,难以应用于大型零件表面修复;且工艺实施过程中产生的有害气体,污染环境,危害工人身体健康的问题,从而提出无粘结铺粉式连续移动感应熔覆工艺。利用正交试验的方法研究感应器移动速度、铺粉层厚度、感应器底面与铺粉层表面之间的间隙对熔覆层几何形貌的影响,获得最佳工艺参数,并对该最佳工艺参数条件下得到的熔覆层进行显微组织和力学性能分析。试验结果表明,无粘结铺粉式连续移动感应熔覆工艺可以使合金粉末与基体材料发生牢固的冶金结合,获得几何形貌与力学性能均良好的熔覆层。

The process of induction cladding is complex,which needs to heat the substrate and the coating materials at 200 ℃ for 2 h until drying them completely,so it is hard to apply such process to the surface repair of large workpieces. What is more,the noxious gas generated in the process is harmful to both the environment and the health of workers. In order to solve such problems,the process of continual induction cladding with no binder spread powder feeding is proposed. Effect of the velocity of inductor,the thickness of powder layer,the distance between the inductor and the powder layer on the geometrical features of clad layer were investigated by way of the orthogonal test,then the optimum process parameters were obtained,and the microstructure and mechanical properties of the clad layer were studied under the optimum process parameters. The results indicate that strong metallurgical bonding can form between the alloy powder and the substrate material under the process of continual induction cladding with no binder spread powder feeding,the geometrical features and the mechanical properties of the clad layer are both good.