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Significance Statement
New coatings technologies are a key factor in securing the lifetime of cutting tools. This research focuses on the study of tool wear of a textured alumina coating and the relation to the workpiece. A multi-scale approach was used with TEM and 3D surface topography. Also a quick stop device was developed to study the chip and inclusion effect (see Fig.). A correlation was found between the wear surfaces and the hard workpiece inclusions. The research identified a nanocrystalline Al2O3 layer on the coating surface and a new abrasion wear model was proposed to explain the abrasion mechanism.
Journal Reference
Tribology International, Available online 19 January 2016.
R. Bejjani1, M. Collin1, T. Thersleff2, S. Odelros1
[expand title=”Show Affiliations”]- Sandvik Coromant Västberga, 116 80 Stockholm, Sweden
- Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden
Abstract
When turning low-alloyed steel with hard inclusions, scores and grooves have been observed in the wear of the alumina coating in CVD coated cutting tools. This study focuses on detailed understanding of flank wear in the textured alumina coating and the relation to the workpiece׳s inclusions.
For chip formation studies, a quick stop device has been used. A topography analysis for the worn coating was performed in the micro scale. Studies at lower scales were performed using TEM. This allowed the study of wear on the coating crystalline structure and the embedment of workpiece material on its surface.
Based on the results, the mechanism behind the initial wear was analyzed and an abrasion wear model is proposed.
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