Effect of Laser Speed and Hatch Spacing on the Corrosion Behavior of 316L Stainless Steel Produced by Selective Laser Melting

Abstract

In this work, the corrosion properties of 316L stainless steel (SS) obtained by selective laser melting (SLM) are analyzed. The electrochemical results of samples manufactured with an energy density between 40 and 140 J/mm3 are compared using different hatch distances and laser speeds. The analysis correlates the impact of the microstructure and processing defects of SLM 316L stainless steel on its behavior against corrosion. The optimal manufacturing conditions were selected considering the electrochemical results. Although the samples obtained with an energy density close to 90 J/mm3 show a high resistance to corrosion, their performance depends on the combination of selected parameters, obtaining the best results for an intermediate laser speed and a low hatch distance. These manufacturing conditions produce a higher breakdown potential, a faster repassivation of the steel and reduce the current density on electrochemical test.

Laser additive manufacturing of magnesium alloys and its biomedical applications

“…After heat treatment, such decrease is more pronounced as E corr of 750 HT case is almost 100 mV <450 HT case. Gradual decrease in corrosion resistance with increase of scan speed was also reported for SLMed Ti-6Al-4V [39] , 316L steel [61] and CoRrW [62] .…”

Passivation Behavior of Different Building Planes of Selective Laser Melting 316L Stainless Steel in 3.5% NaCl Solution

“…The similar observation result was also found in Collazo's study. [21] EBSD was used to study grain size distribution and grain boundary misorientation on different planes. [22] As shown in Figure 4, the columnar grains are be observed, which clearly come along with the Z direction.…”

Нагрев Слоя Металла Сканирующим Лазерным Пучком

“…Нагрев вещества (в дальнейшем рассматриваем металл) происходит под воздействием лазерного пучка, сканирующего по поверхности образца. Режим сканирования во многом определяет качество изготавливаемых образцов, и поэтому влияние сканирования и выбор его стратегии широко изучаются в литературе (см., например, [9][10][11][12][13][14][15][16][17][18]). Следует отметить, что на практике между линиями сканирования всегда имеет место некоторый пространственный промежуток.…”