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Unique microstructural features developed during selective laser melting of CrCoMo alloy and 316L austenitic stainless steel

  • : kamran saeidi1, Bin Qian2, Xin Gao3, Zhijian Shen3
  • : 1Department of Materials and Environmental Chemistry, 2Department of Materials and environmental chemistry, 3Department of materials and environmental chemistry
  • : PDF Download
  • : 2014

Abstract

Selective laser sintering (SLS) or laser melting (SLM) is capable of processing a wide range of materials such as metals, alloys and ceramics. In this work Austenitic stainless steel 316L and CrCoMo alloy parts were fabricated by SLM. Samples were characterized using scanning and transition electron microscopy (SEM/TEM). The observed experimental evidences clearly showed development of non-equilibrium microstructure. Local kinetics and thermal histories lead to formation of complex heterogenuos microstructure. Compositional fluctuation and Mo segragation formed the fine cellular sub-grains which were in the size of 0.5 µm. Electron back scattering diffraction (EBSD) demonstrated formation of the cellular sub-grains inside larger grains and confined by the large grains. The sub-grains exhibited slightly different crystallographic orientation. High concentration of dislocations at the sub-grain boundaries were seen which was due to the enrichment of misplaced Mo in an Austenite lattice.
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