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Influence of tool steel microstructure on friction and initial material transfer
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics.ORCID iD: 0000-0002-8144-8821
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics.
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics.
2014 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 319, no 1-2, 12-18 p.Article in journal (Refereed) Published
Abstract [en]

An investigation was conducted to study the influence of tool steel microstructure on initial material transfer and friction. Two different powder metallurgy tool steels and an ingot cast tool material were tested in dry sliding against 1.4301, 1.4162, Domex 355 MC and Domex 700 MC sheet materials. It was found that tool steel hard phase heights influence initial material transfer and friction. The coefficient of friction increased with decreasing tool steel hard phase heights at 50 N normal load and initial material transfer occurred around protruding hard phases. At higher load of 500 N the sheet material adhered to both the tool steel matrix and hard phases. Coefficient of friction decreased with increasing proof strength of the sheet material at 500 N normal load.

Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 319, no 1-2, 12-18 p.
Keyword [en]
Material transfer, Friction, Galling, Microstructure, Tool steel
National Category
Tribology
Research subject
Materials Engineering
Identifiers
URN: urn:nbn:se:kau:diva-32108DOI: 10.1016/j.wear.2014.07.002ISI: 000345061600002OAI: oai:DiVA.org:kau-32108DiVA: diva2:717959
Available from: 2014-05-19 Created: 2014-05-19 Last updated: 2016-08-16Bibliographically approved
In thesis
1. The influence of tool steel microstructure on galling
Open this publication in new window or tab >>The influence of tool steel microstructure on galling
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In sheet metal forming (SMF) of materials such as stainless steels there is a major problem with transfer and accumulation of sheet material to the metal forming tool surface. The problem is known as galling; a sort of severe adhesive wear, which results in severe scratching of produced parts. In this thesis, the overall aim was to gain knowledge of the influence of tool steel microstructure on galling initiation under sliding conditions. It was discovered that material transfer and tool steel damage caused by sheet material flow creating wear-induced galling initiation sites occurred in the early stage of galling. The galling resistance was higher for tool steels with higher matrix hardness due to better resistance to tool steel damage. Initial friction and critical contact pressure to galling was influenced by the strength of the sheet material. Material transfer happened at low pressures and the friction value was high in a case of sheet materials with lower proof strength, possibly due to the sheet contact against the tool steel matrix resulting in high adhesion and quicker tool damage. It was demonstrated that, in addition to hardness of the tool steel matrix and sheet material proof strength, tool steel microstructural features like size, shape, distribution and height of hard phases are important parameters influencing galling. Tool steels comprising homogeneously distributed, small and high hard phases better prevented the contact between sheet material and the tool steel matrix. Thus, a metal to metal contact with high friction was more efficiently avoided, which resulted in better tool performance.

 

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2014. 42 p.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2014:35
Keyword
Galling, Microstructure, Material transfer, Tool steel, Stainless steel, Metall transfer
National Category
Tribology
Research subject
Materials Engineering
Identifiers
urn:nbn:se:kau:diva-32113 (URN)978-91-7063-568-7 (ISBN)
Public defence
2014-08-29, Ljungbergsalen, 21A 244, Universitetsgatan 2, Karlstad, 10:15 (English)
Opponent
Supervisors
Available from: 2014-06-17 Created: 2014-05-19 Last updated: 2014-06-17Bibliographically approved

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Karlsson, PatrikGåård, AndersKrakhmalev, Pavel
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