Journal
OPTICS AND LASER TECHNOLOGY
Volume 87, Issue -, Pages 17-25Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2016.07.012
Keywords
Selective laser melting; 17-4PH; Density; Defect; Microhardness; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [61475056]
- Natural Science Foundation of Hubei Province of China [2014CFA049]
- Fundamental Research Funds for the Central Universities [HUST: 2013QT002]
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Selective laser melting (SLM) is an additive manufacturing (AM) technique that uses powders to fabricate 3Dparts directly. The objective of this paper is to perform an experimental investigation of selective laser melted 17-4PH stainless steel. The investigation involved the influence of separate processing parameters on the density, defect, microhardness and the influence of heat-treatment on the mechanical properties. The outcomes of this study show that scan velocity and slice thickness have significant effects on the density and the characteristics of pores of the SLMed parts. The effect of hatch spacing depends on scan velocity. The processing parameters, such as scan velocity, hatch spacing and slice thickness, have effect on microhardness. Compared to the samples with no heat-treatment, the yield strength of the heat treated sample increases significantly and the elongation decreases due to the transformation of microstructure and the changes in the precipitation strengthening phases. By a combination of changes in composition and precipitation strengthening, microhardness improved. (C) 2016 Elsevier Ltd. All rights reserved.
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