Effect of Heat Treatment on Temperature and Stress Distribution during Laser Cladding of 316L Steels
In order to study the control effectiveness of different heat treatment processes on the residual stress of laser cladding,a thermo-mechanics coupling model was established by using ANSYS finite element analysis software.The temperature and stress fields during the laser cladding of 316L stainless steel were simulated under the conditions of preheating(22～900 ℃)before cladding,annea-ling treatment(200～1000 ℃)after cladding and combined heat treatment before and after cladding.The results show that preheating has the greatest influence on the temperature of molten pool.The temperature of the molten pool increases with the increase of the preheating temperature.Annealing treatment has the best effect on improving the residual stress of laser cladding,and the residual stress is reduced by about 50％at 800 ℃.Comparatively,followed by preheating and annealing treatment,the residual stress is reduced by about 35％.In addition,preheating treatment may also effectively ad-just the residual stress,with a reduction of 20％at 500 ℃.
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