Effects of process parameters on electrolysis and plasma polishing of selective laser melted 316L stainless steel
[Introduction]The surface of 316L stainless steel part prepared by selective laser melting(SLM)is hard to be polished.[Method]Electrolysis and plasma polishing technology was used to polish it.Some factors affecting the surface roughness(Ra),micromorphology,elemental composition,phase structure,and corrosion resistance of the polished specimen were studied,and the process optimization was carried out by orthogonal test.[Result]The effects of the process parameters on surface roughness are in the following descending order:voltage>polishing time>electrolyte temperature>immersion depth.The process parameters were optimized as follows:voltage 320 V,polishing time 300 s,electrolyte temperature 80℃,and immersion depth 250 mm.The surface roughness of the specimen could be reduced from 2.108 4 μm to 0.212 7 μm after polishing,and the content of Cr on the surface could be increased from the initial 13.92%to 17.28%,and the corrosion potential was positively shifted in a 3.5%NaCl solution,and the corrosion current density was decreased.[Conclusion]Electrolysis and plasma polishing can effectively improve the surface quality of SLMed 316L stainless steel part,reduce its surface roughness,and improve its corrosion resistance.
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