Microstructural investigation of Selective Laser Melting 316L stainless steel parts exposed to laser re-melting

By E. Yasa, Jean-Pierre Kruth. 2011

431 citations recorded by the source corpus.

Abstract Although Selective Laser Melting (SLM) provides many advantages compared to conventional machining, limited surface quality is one of the major drawbacks encountered in the process. Secondly, little residual porosity (1-2%) in SLM parts may be problematic for some applications where high strength and fatigue resistance are necessary. As a remedy, laser re-melting is employed during or after the SLM process. Laser re-melting means that after scanning a layer and melting the powder, the same slice is re-scanned before putting a new layer of powder. If done for each layer, it results in substantially longer production times. It can also be applied to only the last layer or the outer skin of the part if the aim is to reduce the roughness or to enhance the surface properties. In this study, laser re-melting is applied using a continuous wave laser during SLM of AISI 316L stainless steel parts mainly to study the microstructural changes by applying different process parameters.

Subfields: Computational Mechanics, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/0bdd33010d1c12024a1557a58affaabd08bd9731

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In Computational Mechanics

In Mechanical Engineering

Citations in the corpus

Investigation into the effect of process parameters on microstructural and physical properties of 316L stainless steel parts by selective laser melting (2014, background): “Kruth et al. [1] have studied the effect of scan speed and scan spacing on microstructural properties in 316L stainless steel.”
The role of a low-energy–density re-scan in fabricating crack-free Al85Ni5Y6Co2Fe2 bulk metallic glass composites via selective laser melting (2014, background): “It has been reported that the density of some SLM fabricated stainless steel components can be improved by re-scanning [21], however the influence of re-scanning on the thermal stress within SLM-processed crystalline components is limited (and in some”
Laser polishing of selective laser melted components (2015, background): “polishing [6, 10] has gained interest as it has shown potential for selective polishing of metals and alloys.”