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利用激光熔覆及钨极氩弧熔覆(TIG)技术在FV520b钢制备与材料成分相同的熔覆层,并对TIG熔覆层分别进行470°C及615°C回火,分析了熔覆层的微观组织、抗冲蚀能力及冲蚀后的熔覆层表面特性。试验结果表明:激光熔覆层均匀致密,平均显微硬度最高;回火TIG熔覆层性能较母材相似。硬度越高,冲蚀率最高点向高角度方向移动。冲蚀角度小于30°时,激光熔覆层抗冲蚀性能及表面粗糙度较好;高角度冲蚀,激光熔覆层冲蚀率高于回火TIG熔覆层。在冲蚀率最高的角度附近,冲蚀硬化程度最低,正向冲蚀下的硬化程度最高。熔覆层越硬,冲蚀产生的残余拉、压应力都较高。
The cladding layer with the same material composition was prepared by laser cladding and TIG welding technique. The TIG cladding layers were tempered at 470 ° C and 615 ° C, respectively. The effects of cladding Layer microstructure, erosion resistance and erosion of the cladding surface properties. The experimental results show that the laser cladding layer is uniform and compact with the highest average microhardness; and the tempered TIG cladding layer is similar in performance to the base metal. The higher the hardness, the higher the erosion rate to a higher angle. When the erosion angle is less than 30 °, the erosion resistance and surface roughness of the laser cladding layer are better. The erosion rate of the laser cladding layer is higher than that of the TIG cladding layer after high angle erosion. In the erosion rate near the highest angle, the lowest erosion hardening, the highest erosion under the highest degree of erosion. The harder the cladding is, the more residual tension and compressive stress produced by the erosion are.