Mechanical Behaviours of Selective Laser Melting 316L Stainless Steel
Selective laser melting (SLM) is capable of producing metallic components with comparable properties as bulk material. Process parameters and notable interfacial stresses influence the final properties of the final fabricated component. This research investigates the effects of different energy densities (60 and 65 J/mm3) on the physical and mechanical properties; as well as effects on heat treatment temperatures (650, 950 and 1100 °C) on mechanical properties and corrosion behaviour of SLM-ed 316L stainless steel samples. The relative densities are directly proportional to energy densities. High relative densities (>98%) were achieved. The amount and size of porosity are aligned with the relative density. For building orientation, hardness and strength of as-built SLM-ed 316L stainless steel samples are influenced by the combination of pores and high residual stress. High elongation at fracture from around 60% was reached after the heat treatment at 950ºC and above for 60 J/mm3 of SLM-ed 316L stainless steel samples. Also, the hardness, and strength declined after heat treatment due to a decrease in dislocation density, compress stress relief, and an increase in number and size of small voids features. The increased heat treatment temperatures cause a slight reduction of corrosion potential influenced by porosity, dislocation density, and residual stress.
Copyright (c) 2020 Journal of Additive Manufacturing and Advanced Materials
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.