The Research Of Temperature Field Analysis And Application On Laser Remelted Coating Oriented By Jet Electroforming

Jet electroplating is one of high speed electrodeposition processes and can be applied to part electroplate because of its good selectivity quality. Laser remelting is a new kind of technology on material process and surface modification. It can be used in manufacturing good capability on the armor plate with low cost and instead of high-class alloy. In order to obtain the coating which is symmetrical, compact and joined together with substrate, process parameters of laser remelting must be optimized.In this paper, numerical simulation method is used in studying the regular of transient temperature field of 3D moving jet electroplated coating laser remelting and its appliance.(1) Accoding to natural conditions of jet electroplated coating laser remelting, numerical simulation method which is used in research temperature field of jet electroplated coating laser remelting procedure is confirmed. By comparing Finite Diffence Method with Finite Element Method, Finite Element Method is choosed as a calculation method of numerical simulation.(2) Computational model is established for analysis of 3D laser cladding temperature field caused by moving Gauss distributing heat source. The program prepared by the APDL language is attached to the commercial software ANSYS. And this model is used in computing and analysising the temperature field of Jet electroplated nickel coating which is remelted by laser. Then computational model is modifid and verified by comparing calculated result with experimental result. Under the same laser process parameters conditions, the calculated result agrees with the experimental result, this indicates that the established numeric model is correct and reliable.(3) Lastly, using the numerical simulation method, the pool profile, the shape of heat affected zone have been forecasted, then the forming mechanism of microstructure and the influence of coating thickness,density and laser remelting process parameters for temperature field are discussed. The relationship between the corrosion resistance, tensile test result and microstructure is analysed in order to obtain laser remelting process parameters which make temperature field of laser remelting be reasonable.