Influence of sliding speed on modes of material transfer as steel slides against PVD tool coatings |
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| Affiliation: | 1. Tribomaterials group, The Ångström Laboratory, Uppsala University, Box 534, SE-751 21 Uppsala, Sweden;2. Applied Materials Science, The Ångström Laboratory, Uppsala University, Sweden;3. Dalarna University, Borlänge, Sweden;4. Primateria AB, Sågargatan 5, SE-753 18 Uppsala, Sweden;1. Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore, India;2. Department of Mechanical Engineering, Indian Institute of Technology, Palakkad, India;1. State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China;2. Dave Bourell Laboratory for Freeform Fabrication, Mechanical Engineering Department, The University of Texas at Austin, Austin, TX, 78712, USA;1. School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA;2. School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA;1. Central Iron & Steel Research Institute Company Limited, Beijing 100081, China;2. School of Material Science and Engineering, Xiangtan University, Xiangtan 411105, China;1. State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China;2. College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing 400044, China;3. Chongqing Key Laboratory of Metal Additive Manufacturing (3D Printing), Chongqing University, Chongqing, 400044, China |
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| Abstract: | An intermittent sliding test was used in order to study the formation and build-up of tribofilms during intermittent sliding of PVD coated HSS against case hardening steel (20NiCrMo2). Two cutting tool coatings were tested, TiN and AlCrN, and the influence of sliding speed was evaluated. With moderate speed, two tribofilms were formed separately, one consisting of Mn, Si, Al and O on an intermediate layer of Fe and one consisting of Fe, Mn, Cr and O on an intermediate layer of Cr and Mn. At low sliding speeds an uneven transfer of steel occured while high sliding speeds resulted in thermal softening of the substrate leading to coating failure. AlCrN provided better substrate protection at high speeds than TiN did. |
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