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K. Benarji,Y. Ravi Kumar,A. N. Jinoop,C. P. Paul,K. S. Bindra 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.3
This paper reports investigation on the effect of heat-treatment on the microstructure, mechanical, tribological and corrosioncharacteristics of laser directed energy deposition (LDED) built stainless steel (SS 316) bulk structures. LDED built SS316 structures are subjected to solution treatment at 1073 K (HT1073) and 1273 K (HT1273) and reduction in ferrite phasewith heat-treatment is observed from microstructure. X-ray diffraction and microstructure shows that the austenite phaseis observed at all conditions and reducing ferrite phase intensity is noticed with an increase in heat-treatment temperature. Improvement in the plasticity retaining capacity and reduction in micro-hardness by 72.8% and 6.75% are noticed withheat-treatment, respectively. It is observed that the corrosion rate and specific wear rate increases after heat-treatment. Themaximum specific wear rate of 0.19375 × 10–4 mm3/min is observed in the HT1273 sample with wide and deep groovesnoticed on the worn out surface of heat-treated samples. The SEM images of wear track is characterized with abrasive wearmechanism for as-built sample, while heat-treated samples shows plastic deformation, followed by spalling effect. The workpaves a way to understand the effect of heat-treatment on LDED built SS 316 bulk structures.