Effect of Heat-Treatment on the Microstructure, Mechanical Properties and Corrosion Behaviour of SS 316 Structures Built by Laser Directed Energy Deposition Based Additive Manufacturing

• Published in: Metals and materials international 2021, 27(3), , pp.488-499
• Main Authors: Benarji, K., Ravi Kumar, Y., Jinoop, A. N., Paul, C. P., Bindra, K. S.
• Format: Article
• Language: English
• Subjects: Abrasive wear; Characterization and Evaluation of Materials; Chemistry and Materials Science; Construction; Corrosion; Corrosion effects; Corrosion rate; Corrosive wear; Deformation effects; Deformation wear; Deposition; Engineering Thermodynamics; Ferrite; Grooves; Heat and Mass Transfer; Heat treating; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Mechanical properties; Metallic Materials; Microhardness; Microstructure; Plastic deformation; Processes; Reduction; Solid Mechanics; Solution heat treatment; Spalling; Stainless steels; Tribology; Wear mechanisms; Wear rate; 재료공학
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-020-00838-y

This paper reports investigation on the effect of heat-treatment on the microstructure, mechanical, tribological and corrosion characteristics of laser directed energy deposition (LDED) built stainless steel (SS 316) bulk structures. LDED built SS 316 structures are subjected to solution treatment at 1073 K (HT1073) and 1273 K (HT1273) and reduction in ferrite phase with heat-treatment is observed from microstructure. X-ray diffraction and microstructure shows that the austenite phase is 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 with heat-treatment, respectively. It is observed that the corrosion rate and specific wear rate increases after heat-treatment. The maximum specific wear rate of 0.19375 × 10 –4 mm 3 /min is observed in the HT1273 sample with wide and deep grooves noticed on the worn out surface of heat-treated samples. The SEM images of wear track is characterized with abrasive wear mechanism for as-built sample, while heat-treated samples shows plastic deformation, followed by spalling effect. The work paves a way to understand the effect of heat-treatment on LDED built SS 316 bulk structures. Graphic Abstract