Plasma nitriding plus oxidizing as a protective treatment for AISI 4140 steel

AISI 4140 is a typical chromium molybdenum medium alloy steel, widely used as construction steel for machine components. Plasma nitriding has been applied as surface hardening treatment with success but the nitrided layer isn ́t always good for corrosion. Plasma nitriding plus oxidizing is proposed...

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Autores principales: Dalibón Bähler, Eugenia Laura, Vergniaud, Pablo Martín, Karges, Esteban, Cabo, Amado, Brühl, Sonia Patricia
Formato: Documento de conferencia acceptedVersion
Lenguaje:Inglés
Publicado: 2023
Materias:
Plasma nitriding
Duplex plasma treatment
AISI 4140 steel
Oxidized layer
Acceso en línea:http://hdl.handle.net/20.500.12272/7481
Aporte de:
RIA - Repositorio Institucional Abierto (UTN) de Universidad Tecnológica Nacional
id I68-R174-20.500.12272-7481
record_format dspace
institution Universidad Tecnológica Nacional
institution_str I-68
repository_str R-174
collection RIA - Repositorio Institucional Abierto (UTN)
language Inglés
topic Plasma nitriding
Duplex plasma treatment
AISI 4140 steel
Oxidized layer
spellingShingle Plasma nitriding
Duplex plasma treatment
AISI 4140 steel
Oxidized layer
Dalibón Bähler, Eugenia Laura
Vergniaud, Pablo Martín
Karges, Esteban
Cabo, Amado
Brühl, Sonia Patricia
Plasma nitriding plus oxidizing as a protective treatment for AISI 4140 steel
topic_facet Plasma nitriding
Duplex plasma treatment
AISI 4140 steel
Oxidized layer
description AISI 4140 is a typical chromium molybdenum medium alloy steel, widely used as construction steel for machine components. Plasma nitriding has been applied as surface hardening treatment with success but the nitrided layer isn ́t always good for corrosion. Plasma nitriding plus oxidizing is proposed as an environmentally friendly alternative which can assure a good wear resistance and also provide a corrosion protective surface layer. In this investigation, heat treated AISI 4140 steel was plasma nitrided in a 15 hours process at 500 C and then oxidized in the same chamber using two different temperatures: 400 C and 500 C, 1 hour duration in a water steam atmosphere. Microstructure was analysed by optical and electronic microscopy and XRD. Wear resistance was tested in a pin on disk machine using alumina as counterpart and corrosion resistance was evaluated in salt spray fog tests and electrochemical tests in NaCl solution, comparing with only nitrided samples of the same steel. The oxide layer was 0.5 microns width, and the nitrided compound layer beneath, 3 microns width. XRD revealed the presence of magnetite and in a minor proportion, hematite in the oxide layer, and gamma iron nitrides in the nitrided layer. In the pin on disk tests with 3 N load no significative variations occurred between the oxidized samples compared with the only nitrided ones, neither in volume loss nor in friction coefficient. On the other hand, in the salt spray fog tests, only the nitrided samples oxidized at 400 C did not present signs of general corrosion after 100 h test. In the electrochemical tests, both oxidized samples had a nobler corrosion potential and a pseudo passive region, showing a better corrosion behaviour of the oxidized samples compared to the nitrided ones, which suffered from active dissolution in the chloride solution.
format Documento de conferencia
acceptedVersion
author Dalibón Bähler, Eugenia Laura
Vergniaud, Pablo Martín
Karges, Esteban
Cabo, Amado
Brühl, Sonia Patricia
author_facet Dalibón Bähler, Eugenia Laura
Vergniaud, Pablo Martín
Karges, Esteban
Cabo, Amado
Brühl, Sonia Patricia
author_sort Dalibón Bähler, Eugenia Laura
title Plasma nitriding plus oxidizing as a protective treatment for AISI 4140 steel
title_short Plasma nitriding plus oxidizing as a protective treatment for AISI 4140 steel
title_full Plasma nitriding plus oxidizing as a protective treatment for AISI 4140 steel
title_fullStr Plasma nitriding plus oxidizing as a protective treatment for AISI 4140 steel
title_full_unstemmed Plasma nitriding plus oxidizing as a protective treatment for AISI 4140 steel
title_sort plasma nitriding plus oxidizing as a protective treatment for aisi 4140 steel
publishDate 2023
url http://hdl.handle.net/20.500.12272/7481
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