Influence of tool steel surface topography on galling during hot forming of Al-Si coated ultra high-strength steels
2012 (English)In: 15th Nordic Symposium on Tribology - NordTrib 2012: 12 - 15 June 2012 - Trondheim, Norway, Trondheim: Department of Geography, Norwegian University of Science and Technology, 2012Conference paper (Refereed)
Galling is a severe form of adhesive wear encountered in metal forming operations. In hot stamping, an Al-Si coating is normally applied onto the ultra high strength steels (UHSS) to prevent decarburisation and improve the corrosion resistance of the steel. Material transfer occurring from the coated UHSS to the tool surface has been identified as major issue in hot stamping. It is a known problem as this transferred material impairs the quality of the produced parts as well as increases the costs of maintenance of the tools. The present work focuses on the understanding of surface topography parameter and their effect on galling. Surface roughness level and orientation of the roughness marks (lay) on tool surface have been studied. The results showed that a single parameter of the surface topography is not enough to describe the resistance to galling. Parameters such as Rp, Rv and Rsk are also important to consider in order to rank the galling resistance of the surface. The sliding direction with respect to the surface lay also had a significant influence on galling; sliding in the direction parallel to it resulted in substantially reduced material transfer.
Place, publisher, year, edition, pages
Trondheim: Department of Geography, Norwegian University of Science and Technology, 2012.
Research subject Machine Elements
IdentifiersURN: urn:nbn:se:ltu:diva-39423Local ID: e2ed9bb6-3475-4615-aacb-d043af9cd160OAI: oai:DiVA.org:ltu-39423DiVA: diva2:1012935
Nordic Symposium on Tribology : 12/06/2012 - 15/06/2012
Godkänd; 2012; 20120830 (andbra)2016-10-032016-10-03Bibliographically approved