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Evaluation of galling resistance for some selected combinations of tool steels / stainless steel sheet materials/ lubricants using pin-on-disc testing
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. Högskolan Dalarna, Materialvetenskap.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
2010 (English)In: NordTrib 2010: 14th Nordic Symposium on Tribology, Storforsen, Sweden / [ed] Elisabet Kassfeldt, 2010Conference paper, Published paper (Refereed)
Abstract [en]

Stainless steels are well known to be prone to cold welding and material transfer in sliding contacts and therefore difficult to cold form unless certain precautions as discussed in this paper are taken. In the present study different combinations of tool steels/stainless steels/lubricants has been evaluated with respect to their galling resistance using pin-on-disc testing. The results show that a high galling resistance is favored by a high stainless steel sheet hardness and a blasted stainless steel sheet surface topography. The effect of type of lubricant was found to be more complex. For example, the chlorinated lubricants failed to prevent metal-to-metal contact on a brushed sheet surface but succeeded on a blasted sheet surface of the same stainless steel material. This is believed to be due to a protective tribofilm which is able to form on the blasted surface, but not on the brushed surface.

Place, publisher, year, edition, pages
2010.
Keyword [en]
Galling, stainless steels, cold work tool steels, lubricants
National Category
Metallurgy and Metallic Materials
Research subject
Engineering Science with specialization in Tribo Materials
Identifiers
URN: urn:nbn:se:uu:diva-159385OAI: oai:DiVA.org:uu-159385DiVA: diva2:444682
Conference
NordTrib 2010
Available from: 2011-09-29 Created: 2011-09-29 Last updated: 2016-04-18
In thesis
1. Galling of high strength steels and stainless steels in sheet metal forming as evaluated using pin-on-disc testing
Open this publication in new window or tab >>Galling of high strength steels and stainless steels in sheet metal forming as evaluated using pin-on-disc testing
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The thesis focuses on the problem galling in sheet metal forming operations. Galling occurs when sheet metal transfers from the sheet surface onto the tool surface and causes surface damages to following sheets in the forming operation. When this happens the tool must be replaced causing production stops and additional expenses.

The increasing use of high strength steel grades combined with the desire to use more environmentally friendly or no lubricants exposes the tools used for sheet metal forming for tougher forming conditions with higher contact pressures and thus an increasing risk for material pick-up and galling. To prevent this new tool steels, lubricants and coatings have been developed. In this thesis a number of tool steels, high strength steels, stainless steels, coatings and lubricants have been investigated with the test method pin-on-disc testing in order to explain how different premises, such as chemical composition, mechanical properties and surface topography influence on the galling tendency in sheet metal forming.

The results show that there is a big difference in performance between a conventional cast tool steel and a powder metallurgy tool steel with respect to the galling tendency. The results also show that the surface topography of both the tool steels and the sheet materials influence on the performance of the lubricants and the galling tendency.   

When coating a tool steel, the substrate hardness is of greatest importance for the performance and wear of the coating. For the different coatings investigated, the performance of the coatings depends on whether the sheet material is zinc coated or not. However, the CrC/C coating investigated show a good performance with respect to the galling tendency in contact with all of the investigated high strength steel grades.

Place, publisher, year, edition, pages
Uppsala: Uppsala universitet, 2012. viii+30 p.
Keyword
Galling, sheet metal forming, high strength steels, stainless steels
National Category
Metallurgy and Metallic Materials Manufacturing, Surface and Joining Technology
Research subject
Engineering Science with specialization in Tribo Materials
Identifiers
urn:nbn:se:uu:diva-164717 (URN)978-91-506-2266-9 (ISBN)
Supervisors
Available from: 2012-07-18 Created: 2011-12-23 Last updated: 2012-07-18Bibliographically approved

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Eriksson, JennyOlsson, Mikael

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