Resumo

KRAKHMALEV, P.; YADROITSAVA, I.; FREDRIKSSON, G.  e  YADROITSEV, I.. Microstructural and thermal stability of selective laser melted 316l stainless steel single tracks. S. Afr. J. Ind. Eng. [online]. 2017, vol.28, n.1, pp.12-19. ISSN 2224-7890.  http://dx.doi.org/10.7166/28-1-1466.

To remove residual stresses, an as-built SLM object is usually post-treated. This treatment can affect the microstructure, changing the final mechanical characteristics. This investigation is focused on the microstructural characterisation of 316L austenitic stainless steel in as-built and annealed conditions. The SLM microstructure was relatively stable up to 900°C, when cell boundaries start to disappear. At higher temperatures, an insignificant grain coarsening was detected. These microstructural changes caused a gradual drop in the hardness. The obtained result is background for the future development of post-treatment regimens to achieve a high level in the final mechanical properties of SLM objects.

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