Influence of plastic deformation on low temperature surface hardening of stainless steel by gaseous nitriding

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Abstract

This article addresses an investigation of the influence of plastic deformation on low temperature surface hardening by gaseous nitriding of three commercial austenitic stainless steels: AISI 304, EN 1.4369 and Sandvik Nanoflex® with various degrees of austenite stability.
The materials were plastically deformed to different equivalent strains by uniaxial tension. Gaseous nitriding of the strained material was performed in ammonia at atmospheric pressure in the temperature range 693-703 K. Microstructural characterization of the as-deformed states and the nitrided case included X-ray diffraction analysis, reflected light microscopy and microhardness indentation. The results demonstrate that a case of expanded austenite develops and that, in particular, the presence of strain-induced martensite in the initial (deformed) microstructure has a large influence on the nitrided zone.
Original languageEnglish
Title of host publicationHeat Treating 2015: Proceedings of the 28th ASM Heat Treating Society Conference
PublisherASM International
Publication date2015
Pages612-619
ISBN (Electronic)978-1-62708-105-4
Publication statusPublished - 2015
Event28th ASM Heat Treating Society Conference - Detroit. MI, United States
Duration: 20 Oct 201522 Oct 2015
Conference number: 28

Conference

Conference28th ASM Heat Treating Society Conference
Number28
CountryUnited States
CityDetroit. MI
Period20/10/201522/10/2015

Cite this

Bottoli, F., Winther, G., Christiansen, T. L., & Somers, M. A. J. (2015). Influence of plastic deformation on low temperature surface hardening of stainless steel by gaseous nitriding. In Heat Treating 2015: Proceedings of the 28th ASM Heat Treating Society Conference (pp. 612-619). ASM International.