Tribological Testing of Anti-Adhesive coatings for Cold Rolling Mill Rolls--Application to TiN-Coated Rolls

Roll life is a major issue in cold strip rolling. Roll wear may result either in too low roll roughness, bringing friction below the minimum requested for strip entrainment; or it may degrade strip surface quality. On the contrary, adhesive wear and transfer (''roll coating'', &#...

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Bibliographic Details
Main Authors: Ould, Choumad, Montmitonnet, Pierre, Gachon, Yves, Badiche, Xavier
Format: Conference Proceeding
Language:English
Subjects:
ADHESION
ADHESIVES
ALLOYS
CARBIDES
CARBON ADDITIONS
CARBON COMPOUNDS
CERAMICS
CHROMIUM
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COATINGS
DEPOSITION
DEPOSITS
ELEMENTS
FABRICATION
FATIGUE
FRICTION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS SCIENCE
MATERIALS WORKING
MECHANICAL PROPERTIES
METALS
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL VAPOR DEPOSITION
PNICTIDES
ROLLING
ROUGHNESS
STEELS
SURFACE COATING
SURFACE PROPERTIES
SURFACES
TESTING
TITANIUM COMPOUNDS
TITANIUM NITRIDES
TRANSITION ELEMENT ALLOYS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRIBOLOGY
VAPOR DEPOSITED COATINGS
VELOCITY
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Description
Summary:Roll life is a major issue in cold strip rolling. Roll wear may result either in too low roll roughness, bringing friction below the minimum requested for strip entrainment; or it may degrade strip surface quality. On the contrary, adhesive wear and transfer (''roll coating'', ''pick up'') may form a thick metallic deposits on the roll which increases friction excessively and degrades strip surface again [1]. The roll surface, with the help of a materials-adapted lubricant, must therefore possess anti-wear and anti-adhesive properties. Thus, High Speed Steeel (HSS) rolls show superior properties compared with standard Cr-steel rolls due to their high carbide surface coverage. Another way to improve wear and adhesion properties of surfaces is to apply hard metallic (hard-Cr) or ceramic coatings. Chromium is renowned for its excellent anti-wear and anti-adhesive properties and may serve as a reference. Here, as a first step towards alternative, optimised coatings, a PVD TiN coating has been deposited on tool steels, as previous attempts have proved TiN to be rather successful in cold rolling experiments [2,3]. Different tribological tests are reported here, giving insight in both anti-adhesive properties and fatigue life improvement.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.3589768