The simulation analysis on laser cladding for 2A14 aluminum alloy
Aluminum alloy materials possess characteristics such as high thermal conductivity and low laser ab-sorptivity.In the cladding process,if the temperature field gradient of the molten pool is too large,defects like Al2O3 oxide film,pores,and cracks are likely to form.Numerical simulation and emulation are carried out in the Simufact Welding software for the cladding of AlSi9Mg on the surface of 2A14 aluminum alloy,using the double-ellipsoid heat source model.The temperature field and stress field conditions under different laser powers and scanning rates are obtained.Through analysis,it can be seen that as the laser power increases,the peak temper-ature of the molten pool will increase accordingly.When the cooling rate decreases,the residual stress increases.While an increase in the scanning speed will cause the peak values of both the molten pool temperature and the residual stress to decline.Experiments to determine the process parameters based on the analysis results show that from the bonding zone to the surface of the AlSi9Mg cladding layer,the microstructure morphology exhibits a transformation pattern from continuous planar crystals and dendritic crystals gradually to equiaxed crystals.Even-tually,the cladding layer forms a metallurgical bonding structure with a dense structure.
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维普
