Analysis of Structure and Properties of 30CrMnSiA Laser Cladding Heterogeneous Powder Cladding Layers

During the laser cladding process, the selection of filler metal powder based on strength matching is mainly divided to three types of material strength: low strength matching, equal strength matching and high strength matching. 30CrMnSiA steel is a medium carbon low alloy high-strength steel that is prone to cracking during laser cladding repair. In order to clarify the powder selection of 30CrMnSiA products, the microstructure and properties of the cladding layer were studied, which were obtained by using 30CrMnSiA as the base material, using the high-temperature alloy powder GH4169, the structural steel powder 30CrMnSiA, the ultra-high strength steel powder 30CrMnSiNi2A and the austenitic stainless steel powder 1Cr18Ni9Ti as laser cladding powder. The research results indicate that the degree of oxidation during laser cladding is ranked in descending order: 1Cr18Ni9Ti>30CrMnSiNi2A>GH4169>30CrMnSiA. The hardness of the heat affected zone near the cladding layer is higher, while the hardness value of the heat affected zone near the substrate is lower. The average hardness of each area in laser cladding is 30CrMnSiNi2A cladding layer>30CrMnSiA cladding layer>substrate heat affected zone>GH4169 cladding layer>1Cr18Ni9Ti cladding layer>30CrMnSiA annealed substrate.