oru.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
The influence of tool steel microstructure on galling
Karlstad university, Karlstad, Sweden.ORCID iD: 0000-0002-8144-8821
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. , p. 42
Series
Karlstad University Studies, ISSN 1403-8099 ; 2014:35
Keywords [en]
Galling, Microstructure, Material transfer, Tool steel, Stainless steel, Metall transfer
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Materials Engineering Mechanical Engineering
Research subject
Materials Engineering
Identifiers
URN: urn:nbn:se:oru:diva-61013ISBN: 978-91-7063-568-7 (print)OAI: oai:DiVA.org:oru-61013DiVA, id: diva2:1141231
Public defence
2014-08-29, Ljungbergsalen, 21A 244, Universitetsgatan 2, 10:15 (English)
Opponent
Supervisors
Available from: 2017-09-21 Created: 2017-09-14 Last updated: 2018-06-25Bibliographically approved

Open Access in DiVA

fulltext(2610 kB)117 downloads
File information
File name FULLTEXT01.pdfFile size 2610 kBChecksum SHA-512
0bc4d47333c54bc4a2901470adde4b82951dd950697d24f3217e3668b782b0ced088ccb9061656c18550ff42868058bec8ba7d838a8175f01e34474352cd0c76
Type fulltextMimetype application/pdf

Authority records BETA

Karlsson, Patrik

Search in DiVA

By author/editor
Karlsson, Patrik
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)Materials EngineeringMechanical Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 117 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 151 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf