Structural Characterization of Ion Nitrided 316L Austenitic Stainless Steel: Influence of Treatment Temperature and Time

Ozkan Gokcekaya*, Celaletdin Ergun*, Turgut Gulmez, Takayoshi Nakano, Safak Yilmaz

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The ion nitriding behavior of AISI 316L austenite stainless steel was investigated at different nitriding times (2 h, 4 h, and 9 h) and temperatures (450 C, 500 C, and 550 C). The structural characterization has been assessed by several considerations which can be listed: (i) the evaluation of phase distribution through Rietveld analysis of X-ray diffraction patterns and accompanying peak fitting process, (ii) hardness profile and related nitride layer thickness by microhardness and micro-scopic measurements, and (iii) displacement measurements to assess the residual stress accumulation. The diffusion of nitrogen atomic species into the sample surface caused a transformation of the γ phase matrix into an expanded austenite (γN ) phase, which is recognized with its high hardness and wear resistance. Furthermore, depending on the nitriding condition, chromium nitride (Cr1-2 N) and iron nitride (ε-Fe2-3 N and γ-Fe4 N) phases were detected, which can be detrimental to the corrosion resistance of the 316L austenite stainless steel. The γN phase was observed in all nitriding conditions, resulting in a significant increase in the surface hardness. However, decomposition of the γN phase with an increase in nitriding temperature eventually altered the surface hardness distribution in the nitriding layer. Considering the phase-type and distribution with the consequent hardness characteristics in the nitride layer, to our best knowledge, this is the first report in which an ion-nitriding temperature of 500 C (higher than 450 C) and time of 9 h can be proposed as ideal processing parameters leading to optimal phase composition and hardness distribution for 316L austenite stainless steels particularly for the applications requiring a combination of both wear and corrosion resistance.

Orijinal dilİngilizce
Makale numarası306
Basın numarası2
Yayın durumuYayınlandı - Şub 2022

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© 2022 by the authors. Licensee MDPI, Basel, Switzerland.


Funding: This research was financially supported by the Scientific and Technological Research Council of Turkey (TUBITAK Contract No: 106M053 and 106M202) and Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) (Grant Number: JP18H05254).

FinansörlerFinansör numarası
TUBITAK106M202, 106M053
Japan Society for the Promotion of ScienceJP18H05254
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu

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