Optimization of forming process for 430 stainless steel by selective laser melting
The relationship between the forming quality and process parameters of selective laser melting(SLM)430 stainless steel wire-surface-body was studied.Single channel,multi channel overlap and block forming experiments were designed to analyze the causes of defect formation during the SLM process,with density as the evaluation index,and determine the optimal forming parameters for SLM 430 stainless steel.The results show that high laser power and low scanning speed are conducive to obtaining continuous and uniform single channel morphology.When the laser power is 200 W and the scanning speed is 800 mm/s,the channel width distribution is uniform.The results of multiple overlapping show that the surface roughness first decreases and then increases with the increase of scanning spacing.When the scanning spacing is 0.08 mm,the roughness is the minimum of 3.88 μm,and the surface forming quality is the best.Through orthogonal experimental analysis,it is found that the significant order of the effects of three factors on the relative density of block shaped parts is:scanning speed＞laser power＞scanning spacing.The relative density decreases with the increase of scanning speed.As the laser power and scanning spacing increase,the relative density shows a trend of first increasing and then decreasing.The optimal combination of forming process parameters for SLM 430 stainless steel is ultimately determined as laser power of 200 W,scanning speed of 600 mm/s,and scanning spacing of 0.08 mm,and the relative density of the formed part prepared with the optimal parameters reaches 99.56%.
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