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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
 [1];  [2];  [3];  [4];  [5];  [1]
  1. Kalasalingam Academy of Research and Education, Krishnankoil, Tamil Nadu (India)
  2. National Metallurgical Laboratory (CSIR-NML) (India)
  3. Centre for Military Airworthiness and Certification (CEMILAC) (India)
  4. King Mongkut's University of Technology, Bangkok (Thailand)
  5. 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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