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Influence of size and distribution of hard phases in tool steels on the early stage of galling
Department of Mechanical and Materials Engineering, Karlstad University, Karlstad, Sweden.ORCID-id: 0000-0002-8144-8821
Department of Mechanical and Materials Engineering, Karlstad University, Karlstad, Sweden.
Department of Mechanical and Materials Engineering, Karlstad University, Karlstad, Sweden.
Department of Mechanical and Materials Engineering, Karlstad University, Karlstad, Sweden.
2012 (engelsk)Inngår i: TOOL 2012: proceedings of the 9th international tooling conference, developing the world of tooling, Montanuniversität Leoben 11-14 September 2012 / [ed] Herald Leitner, Regina Kranz, Angelika Tremmel, Knittelfeld: Verlag "Gutenberghaus" , 2012Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

In sheet metal forming processes, contact pressures are relatively high and total sliding distances are long, which demands tool steels to prevent tool damage and to resist galling. Galling is related to microscopic and macroscopic material transfer, but, the mechanisms of initiation are not thoroughly understood.

To investigate galling initiation, lubricated sliding testing in the Slider-On-Flat-Surface (SOFS) tribometer was performed for ingot cast (IC) AISI D2 type and nitrogen alloyed powder metallurgy (PM) tool steel. The sheet grade was EN 1.4509 ferritic stainless steel. To reveal mechanisms in the early stages of galling initiation, transfer and accumulation of sheet material to the tool surfaces were characterized using AFM and SEM.

It was found that already after a short sliding distance, transfer of sheet material occurred covering both the matrix and the hard phases. Macroscopic analysis of the contact area showed that initial material transfer and further lump growth occurred at positions corresponding to high plastic strains in the sheet material. Even though initial material transfer was observed for both tested tool steels, the sliding distance to the point where transfer and further lump formation occurred was longer for the PM tool steel. This was discussed in correlation to differences in size and distribution of the hard phases in the tool steels, which was confirmed by AFM and SEM.

sted, utgiver, år, opplag, sider
Knittelfeld: Verlag "Gutenberghaus" , 2012.
Emneord [en]
Galling, Stainless steel, Tool steel, SOFS
HSV kategori
Identifikatorer
URN: urn:nbn:se:oru:diva-58819ISBN: 978-3-901384-52-3 (tryckt)OAI: oai:DiVA.org:oru-58819DiVA, id: diva2:1128238
Konferanse
9th International tooling conference (Tool 2012), Montanuniversität Leoben, Austria, September 11-14, 2012
Tilgjengelig fra: 2012-10-26 Laget: 2017-07-24 Sist oppdatert: 2018-01-13bibliografisk kontrollert

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