TRIBOLOGICAL EVALUATION OF SURFACE TEXTURING AND HARD CHROMIUM COATING APPLIED TO COLD ROLLING MILLS ROLLS STEELS

The present work analyzes the tribological behavior of surface modifications often used in cold rolling mill rolls. Different surface modifications were carried out on samples produced from a fragment of the rolling mill roll: i) texturing; ii) chromium plating; iii) texturing with subsequent hard c...

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Veröffentlicht in:Tecnologia em Metalurgia, Materiais e Mineracao Materiais e Mineracao, 2012-01, Vol.9 (4), p.336-344
Hauptverfasser: Junior, Jose Lucio Goncalves, De Mello, Jose Daniel Biasoli
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De Mello, Jose Daniel Biasoli
description The present work analyzes the tribological behavior of surface modifications often used in cold rolling mill rolls. Different surface modifications were carried out on samples produced from a fragment of the rolling mill roll: i) texturing; ii) chromium plating; iii) texturing with subsequent hard chrome plating; iv) and hard chrome plating with subsequent texturing. Before the surface modifications the samples were heat treated and ground on both faces. Wear tests were performed using a reciprocating movement of a ball over flat configuration under a load of 9.8 N. It is observed that there is no significant change in the coefficient of friction as a function of surface modification. Surface texturing increases the wear of the counter body, while the hard chromium coating reduces it. The addition of hard chromium coating promotes the formation of a tribolayer on the counter body consisting of chromium and oxygen. On the other hand, for the samples without hard chrome coating, the tribolayer consists of iron and oxygen.
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subjects Chromium
Chromium plating
Coating
Cold rolling mills
Rolls
Texturing
Tribology
Wear tests
title TRIBOLOGICAL EVALUATION OF SURFACE TEXTURING AND HARD CHROMIUM COATING APPLIED TO COLD ROLLING MILLS ROLLS STEELS
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