Document Type : Research paper
Authors
1 Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute
2 Researcher of AEOI
Abstract
Selective laser melting (SLM) is an additive manufacturing technique to fabricate metal pieces, in which a laser beam with a high energy density is used to melt a metal powder substrate. This technique has several advantages including the possibility of fabricating complex metal components in a short time. The microstructure and optimal mechanical properties are the important considerations in the manufacturing of metal parts by SLM method. In this study, the mechanical properties and the microstructure of a 316L stainless steel sample manufactured by the SLM method are investigated. Results compared with the characteristics of an annealed 316L rolled bar, and the characteristics described for a component produced by direct laser deposition (DLD) technique. The result represents that the mechanical strength and micro hardness of the sample produced by SLM technique are higher than the other samples, and the elongation percentage is within the desirable range. The yield stress, tensile strength, and elongation percentage are respectively 595Mpa, 696Mpa, and 34.5%, all of which are within the acceptable range required by the standards for such samples. The investigation of the microstructure shows a full austenitic cellular structure without considerable solidification defects.
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