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.
Highlights
Additive manufacturing (AM) is an attractive technique that makes it possible to create complex free-form objects with a 3D model by using additive manufacturing technology
The present study aims to evaluate the corrosion behavior of selective laser melting (SLM) 316L stainless steel (SS) building with different input energy density, hatch spacing and traverse speed
It is worth highlighting the low porosity of samples B, C, and D obtained with an intermediate energy density, close to 90 J/mm3
Summary
Additive manufacturing (AM) is an attractive technique that makes it possible to create complex free-form objects with a 3D model by using additive manufacturing technology. The AM process was used to create visualization model products, but this technology developed over time, improving the properties, accuracy, and overall quality of materials, allowing suitable outputs for end use [1]. AM has a number of advantages, such as the possibility of manufacturing complex parts, efficient use of materials without subsequent machining, suitability for low production volumes, manufacturing with a wide variety of metal alloys, and the search for new alloys. There are different AM techniques that can be included in the following methods: fused deposition modeling (the most common used for polymer filaments), powder bed fusion, inkjet binding and contour crafting, stereolithography, direct energy deposition and laminated object manufacturing [2,3]. The process generates metallurgical defects such as a lack of fusion, porosity by entrapped gas, dislocation networks, residual stress, solute segregation, surface roughness, among others, which can result in worse properties than traditional manufacturing methods [7,8,9]
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