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Comprehensive analysis of pulsed plasma nitriding preconditions on the fatigue behavior of AISI 304 austenitic stainless steel

Authors
  • Unal, Okan1, 1
  • Maleki, Erfan2
  • Varol, Remzi3
  • 1 Karabuk University, Karabuk, 78050, Turkey , Karabuk (Turkey)
  • 2 Sharif University of Technology-International Campus, Kish Island, 79417-76655, Iran , Kish Island (Iran)
  • 3 Suleyman Demirel University, Isparta, 32200, Turkey , Isparta (Turkey)
Type
Published Article
Journal
International Journal of Minerals, Metallurgy and Materials
Publisher
University of Science and Technology Beijing
Publication Date
Apr 12, 2021
Volume
28
Issue
4
Pages
657–664
Identifiers
DOI: 10.1007/s12613-020-2097-x
Source
Springer Nature
Keywords
License
Yellow

Abstract

This study aims to draw an exact boundary for microstructural and mechanical behaviors in terms of pulsed plasma nitriding conditions. The pulsed plasma nitriding treatment was applied to AISI 304 austenitic stainless steel at different temperatures and durations. Results reveal that nitriding depth increased as process temperature and duration increase. The nitriding depth remarkably increased at 475°C for 8 h and at 550°C for 4 h. An austenite structure was transformed into a metastable nitrogen-oversaturated body-centered tetragonal expanded austenite (S-phase) during low-temperature plasma nitriding. The S-phase was converted to CrN precipitation at 475°C for 8 h and at 550°C for 4 h. Surface hardness and fatigue limit increased through plasma nitriding regardless of process conditions. The best surface hardness and fatigue limit were obtained at 550°C for 4 h because of the occurrence of CrN precipitation.

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