Influence of bulk energy density on corrosion resistance of 316L stainless steel formed by SLM

doi:10.13251/j.issn.0254-6051.2022.05.024

Abstract

Abstract: In order to explore the effect of different bulk energy density on corrosion resistance of SLM formed 316L stainless steel, SLM 316L stainless steel formed parts were prepared under different laser power, scanning spacing and scanning speed by orthogonal test method. The microstructure and self-corrosion potential were observed and measured by means of scanning electron microscope and electrochemical test. The results show that if the bulk energy density is too large or very small, there are more defects such as pores and holes on the surface of the molded parts, the self-corrosion potential is decreased, and the corrosion resistance is deteriorated. When the bulk energy density is 44.64 J/mm^-3, the self-corrosion potential of SLM 316L stainless steel molded parts is the highest, the defects such as pores on the surface are relatively few, and the corrosion resistance is the best. The order of the factor of laser power, scanning distance and scanning speed on the corrosion resistance of SLM 316L stainless steel molded parts is: laser power > scanning distance and scanning speed. The best combination of process parameters is laser power of 250 W, scanning spacing of 0.14 mm and scanning speed of 800 mm/s.

Key words: 316L stainless steel, bulk energy density, defects, corrosion resistance

CLC Number:

TG142.71

Li Peng, Kong Linghua, Lian Guofu, Huang Xu, Li Zhu. Influence of bulk energy density on corrosion resistance of 316L stainless steel formed by SLM[J]. Heat Treatment of Metals, 2022, 47(5): 148-154.

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