Effect of nitriding on mechanical and microstructural properties of Direct Metal Laser Sintered 17-4PH stainless steel
Journal Article
·
· Journal of Materials Research and Technology
- Kalasalingam Academy of Research and Education, Krishnankoil, Tamil Nadu (India)
- National Metallurgical Laboratory (CSIR-NML) (India)
- Centre for Military Airworthiness and Certification (CEMILAC) (India)
- King Mongkut's University of Technology, Bangkok (Thailand)
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
In this work, the effect of the nitriding process on microstructure and mechanical properties of additively manufactured (AM) 17-4PH stainless steel is investigated. The nitriding was performed at 530 °C, 560 °C, and 580 °C for 2 h. The nitriding process improves the hardness and surface roughness of the AM 17-4PH steel. Detailed microstructural characterizations of both as-built and nitride samples are performed using an optical microscope, scanning electron microscope (SEM) equipped with energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction technique. It reveals that the nitride layer thickness increases with nitriding temperature. A distinct transition layer between the substrate and nitride layer is observed in the 560 °C and 580 °C nitride samples. The nitriding process develops almost equiaxed grain microstructure with new secondary phase precipitates, whereas in the as-built material, the grains are primarily columnar along the AM process build direction. Specifically, the nitriding process introduces γ-Fe4N, ε-Fe3N, CrN, and Ni3N precipitates. The increase in Ni- and Cu-rich precipitates with the nitriding temperature explains the observed improvement in the hardness and surface roughness. Furthermore, the nitriding process does not alter the substrate's initial weak crystallographic texture.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1974945
- Report Number(s):
- LA-UR-22-26002
- Journal Information:
- Journal of Materials Research and Technology, Journal Name: Journal of Materials Research and Technology Vol. 19; ISSN 2238-7854
- Publisher:
- Brazilian Metallurgical, Materials and Mining AssociationCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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