Research on microstructure and properties of Ni-based alloy layer for laser cladding remanufacturing
Experimental research was done about multi-layer Ni-based alloy trapezoidal groove using laser cladding remanufacturing technology,the phase composition and microstructure of repaired zone were analyzed,and the effects of microhardness and corrosion resistance of the cladding layer were studied about structural changes in the repaired zone.The results showed that good metallurgical bond-ing was obtained between the repaired zone and the substrate,the structure of its bonding zone was mainly composed of columnar and cellular crystals,the microstructure inside the cladding layer was mainly composed of columnar and equiaxed crystals,the high dislocation density was found,and it was mainly composed of small angle grain boundaries in the grains,the average microhardness of the repaired zone was approximately 2.23 times that of the substrate,compared to the substrate,the repaired zone had better corrosion resistance.
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