The Effect Of The Transition Elements On Microstructure And Properties Of Plasma Cladding Coating

Based on the popular research spot in plasma cladding material, this paper prepared special iron-based materials and nickel based materials for plasma cladding and optimized the plasma caldding process, aming at direct deformation by powder plasma deposition.Considering the poor operational performance of traditional plasma cladding materials,this paper developed two systems of special iron-based materials and nickel based materials for plasma cladding and optimized the plasma cladding technique. The investigation indicated that:(1)The transitional elements added into the alloys have precipitated in grain boundry,which remarkably improved the hardness of the plasma cladding layer; (2)The erosion resistance of the plasma cladding layer has been enhanced due to the dispersion strengthening effect of the transitional elements; (3)Solid solution and aging prompted the diffusion of transitional elements into the cystals, bringing down the hardness of the plasma cladding layer;(4)For the nickel based alloys, the addition of Ta, Zr and Hf imposed a positive effect of the strength at high temperature and breaking tenacity at room temperature; the elements zirconium and hafnium could were grain refining elements which could influence the recrystallization. Aging at 600 ℃ for 5h, dispersed phase was formed to improve the strength at high temperature and breaking tenacity at room temperature and to refine the grain with decreased columnar crystal and afterbirth-like crystal and increased isometric crystal,improvingthe strength at high temperature and breaking tenacity at room temperature...