Surface Modification of a Nickel-Free Austenitic Stainless Steel by Low-Temperature Nitriding

Low-temperature nitriding allows to improve surface hardening of austenitic stainless steels, maintaining or even increasing their corrosion resistance. The treatment conditions to be used in order to avoid the precipitation of large amounts of nitrides are strictly related to alloy composition. Whe...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Francesca Borgioli, Emanuele Galvanetto, Tiberio Bacci
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	austenitic stainless steels Ni-free austenitic stainless steels low-temperature nitriding expanded austenite S-phase hardening Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/03ef088c9baa456fb1debabb51e96a14
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:03ef088c9baa456fb1debabb51e96a14
record_format	dspace
spelling	oai:doaj.org-article:03ef088c9baa456fb1debabb51e96a142021-11-25T18:22:21ZSurface Modification of a Nickel-Free Austenitic Stainless Steel by Low-Temperature Nitriding10.3390/met111118452075-4701https://doaj.org/article/03ef088c9baa456fb1debabb51e96a142021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1845https://doaj.org/toc/2075-4701Low-temperature nitriding allows to improve surface hardening of austenitic stainless steels, maintaining or even increasing their corrosion resistance. The treatment conditions to be used in order to avoid the precipitation of large amounts of nitrides are strictly related to alloy composition. When nickel is substituted by manganese as an austenite forming element, the production of nitride-free modified surface layers becomes a challenge, since manganese is a nitride forming element while nickel is not. In this study, the effects of nitriding conditions on the characteristics of the modified surface layers obtained on an austenitic stainless steel having a high manganese content and a negligible nickel one, a so-called nickel-free austenitic stainless steel, were investigated. Microstructure, phase composition, surface microhardness, and corrosion behavior in 5% NaCl were evaluated. The obtained results suggest that the precipitation of a large volume fraction of nitrides can be avoided using treatment temperatures lower than those usually employed for nickel-containing austenitic stainless steels. Nitriding at 360 and 380 °C for duration up to 5 h allows to produce modified surface layers, consisting mainly of the so-called expanded austenite or γ<sub>N</sub>, which increase surface hardness in comparison with the untreated steel. Using selected conditions, corrosion resistance can also be significantly improved.Francesca BorgioliEmanuele GalvanettoTiberio BacciMDPI AGarticleaustenitic stainless steelsNi-free austenitic stainless steelslow-temperature nitridingexpanded austeniteS-phasehardeningMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1845, p 1845 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	austenitic stainless steels Ni-free austenitic stainless steels low-temperature nitriding expanded austenite S-phase hardening Mining engineering. Metallurgy TN1-997
spellingShingle	austenitic stainless steels Ni-free austenitic stainless steels low-temperature nitriding expanded austenite S-phase hardening Mining engineering. Metallurgy TN1-997 Francesca Borgioli Emanuele Galvanetto Tiberio Bacci Surface Modification of a Nickel-Free Austenitic Stainless Steel by Low-Temperature Nitriding
description	Low-temperature nitriding allows to improve surface hardening of austenitic stainless steels, maintaining or even increasing their corrosion resistance. The treatment conditions to be used in order to avoid the precipitation of large amounts of nitrides are strictly related to alloy composition. When nickel is substituted by manganese as an austenite forming element, the production of nitride-free modified surface layers becomes a challenge, since manganese is a nitride forming element while nickel is not. In this study, the effects of nitriding conditions on the characteristics of the modified surface layers obtained on an austenitic stainless steel having a high manganese content and a negligible nickel one, a so-called nickel-free austenitic stainless steel, were investigated. Microstructure, phase composition, surface microhardness, and corrosion behavior in 5% NaCl were evaluated. The obtained results suggest that the precipitation of a large volume fraction of nitrides can be avoided using treatment temperatures lower than those usually employed for nickel-containing austenitic stainless steels. Nitriding at 360 and 380 °C for duration up to 5 h allows to produce modified surface layers, consisting mainly of the so-called expanded austenite or γ<sub>N</sub>, which increase surface hardness in comparison with the untreated steel. Using selected conditions, corrosion resistance can also be significantly improved.
format	article
author	Francesca Borgioli Emanuele Galvanetto Tiberio Bacci
author_facet	Francesca Borgioli Emanuele Galvanetto Tiberio Bacci
author_sort	Francesca Borgioli
title	Surface Modification of a Nickel-Free Austenitic Stainless Steel by Low-Temperature Nitriding
title_short	Surface Modification of a Nickel-Free Austenitic Stainless Steel by Low-Temperature Nitriding
title_full	Surface Modification of a Nickel-Free Austenitic Stainless Steel by Low-Temperature Nitriding
title_fullStr	Surface Modification of a Nickel-Free Austenitic Stainless Steel by Low-Temperature Nitriding
title_full_unstemmed	Surface Modification of a Nickel-Free Austenitic Stainless Steel by Low-Temperature Nitriding
title_sort	surface modification of a nickel-free austenitic stainless steel by low-temperature nitriding
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/03ef088c9baa456fb1debabb51e96a14
work_keys_str_mv	AT francescaborgioli surfacemodificationofanickelfreeausteniticstainlesssteelbylowtemperaturenitriding AT emanuelegalvanetto surfacemodificationofanickelfreeausteniticstainlesssteelbylowtemperaturenitriding AT tiberiobacci surfacemodificationofanickelfreeausteniticstainlesssteelbylowtemperaturenitriding
_version_	1718411238511214592

Surface Modification of a Nickel-Free Austenitic Stainless Steel by Low-Temperature Nitriding

Ejemplares similares