Nanotribological characterization of advanced tool steels
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Nanotribologisk karakterisering av avancerade verktygsstål (Swedish)
Tribological problems of tool–work piece interaction is a key aspect influencing product quality, process performance and tool lifetime. For example, in sheet metal forming operations, sliding contact may cause adhesive wear of sheet materials with build up of worn material on the tool surface. This tribological problem often resulted in loss of tolerance and product quality and is called galling.
It was demonstrated that tendency to adhesive wear depends on the steel grade, which means high importance of chemical- and phase-constitution of the tool steel. It was suggested that adhesion to the matrix is critical due to metal to metal contact while carbide phase prevent adhesion of conterbody materials. Nevertheless, in macroscale tests it is difficult or even impossible to separate contribution of each phase into the wear mechanism.
In the present work, selected steels are to be investigated at nanoscale by means of AFM facilities. Main attention will be paid on adhesion and frictional properties of steel matrix and primary phase. As expected and reported in several articles, carbides, carbonitrides and nitrides may behave differently, contributing into the final performance differently. Additional attention will be paid on phase size and distribution, meaning they are also important parameters influencing tribological behaviour.
Place, publisher, year, edition, pages
2010. , 55 p.
Other Materials Engineering
IdentifiersURN: urn:nbn:se:kau:diva-35167OAI: oai:DiVA.org:kau-35167DiVA: diva2:786788
Subject / course
Engineering (300 ECTS credits)