The nitriding behavior of austenitic stainless steels (AISI 304 and 316) was studied by different cold work degree (0&#x25; (after heat treated), 10&#x25;, 20&#x25;, 30&#x25;, and 40&#x25;) before nitride processing. The microstructure, layer thickness, hardness, and chemical microcomposition were evaluated employing optical microscopy, Vickers hardness, and scanning electron microscopy techniques (WDS microanalysis). The initial cold work (previous plastic deformations) in both AISI 304 and 306 austenitic stainless steels does not show special influence in all applied nitriding kinetics (in layer thicknesses). The nitriding processes have formed two layers, one external layer formed by expanded austenite with high nitrogen content, followed by another thinner layer just below formed by expanded austenite with a high presence of carbon (back diffusion). An enhanced diffusion can be observed on AISI 304 steel comparing with AISI 316 steel (a nitrided layer thicker can be noticed in the AISI 304 steel). The mechanical strength of both steels after nitriding processes reveals significant hardness values, almost 1100&#x2009;HV, on the nitrided layers.

Waldemar Alfredo Monteiro

Silvio Andre Lima Pereira

Jan Vatavuk

Nitriding Process Characterization of Cold Worked AISI 304 and 316 Austenitic Stainless Steels

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Journal of Metallurgy - Table of contents 2017

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Table of Contents 2017  | Journal of Metallurgy | Hindawi

Journal of Metallurgy

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Journal of Metallurgy

Table of Contents

Table of Contents: 2017

Nitriding Process Characterization of Cold Worked AISI 304 and 316 Austenitic Stainless Steels