Surface Roughness Effect on the Fatigue Lifetime of SLM Stainless Steel (316L) Parts.

الملخص

In the realm of scientific materials, all kinds of metals have natural properties such as mechanical strength, strain, and hardness etc. However, the surface roughness of a materialcan has effects on product quality and mechanical performance, such as fatigue, creep and corrosion resistance. Additive manufacturing technologies such SLM has offereda new design possibilityin terms of industrial application, but the product still suffer from poor surface roughness which ranges from 10- 30microns. Therefore, good control of the SLM process and post-process is necessary to decrease the range of surface roughness. Moreover, knowledge about dynamic mechanical behavior is still lacking due to process parameter changes. The main aim of this study is to assess the performance(fatigue lifetime) of SLM stainless steel (316L) parts subjected to two different stages of surface finish method, namely laser remelting and electro-polishing. The samples under various surface toughness and after applying the above stages of surface finish were tested by using a fatigue tester (HSM 20).Also the S-N curve of the samples was plotted and the results reveal about 50% of total improvement in fatigue lifetime.