Abstract
In this article, laser metal-wire depositing was conducted on 316 L stainless steel. Microstructures and mechanical properties of deposited samples were carefully studied employing an optical microscope (OM), scanning electron microscope (SEM) and other methodologies. A well-formed product was successfully acquired by means of process optimization including multi-layer single-pass and single-layer multi-pass laser deposition. The structures of multi-layer multi-pass deposited samples exhibited the characteristics of epitaxial column growth. The resulting ferrite at grain boundaries (GBs) revealed a subgrain structure. The brand structures between adjacent layers were composed of tiny cellular and columnar grains, meaning unexpected metallurgical bonding. The average hardness was 222 HV and no much fluctuation occurred in tested samples. The maximum tensile strength and elongation of deposited samples reached 110 % and 140 % of rolled samples, respectively. The uniformly-distributed dimples at the fracture proved that laser depositing product had good plasticity and ductility.
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