Composition,microstructure and mechanical properties of boron containing multilayer coatings for hot forming tools |
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| Authors: | H. Paschke M. Stueber C. Ziebert M. Bistron P. Mayrhofer |
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| Affiliation: | 1. Fraunhofer Institute for Surface Engineering and Thin Films IST, Eberhardstraße 12, D-44145 Dortmund, Germany;2. Karlsruhe Institute of Technology, Institute for Materials Research I, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany;3. Institute of Metal Forming and Metal-Forming Machines IFUM, Dep. of Massive Forming, Leibniz Universitaet Hannover, An der Universitaet 2, D-30823 Garbsen, Germany;4. Department of Physical Metallurgy and Materials Testing at Montanuniversitaet Leoben, Franz-Josef-Straße 18, A-8700 Leoben, Austria;1. AC2T research GmbH, Viktor Kaplan Strasse 2/C, Wiener Neustadt, Austria;2. Magna Cosma Engineering Europe, Puchberger Straße 267, Weikersdorf am Steinfelde, Austria;3. Vienna University of Technology, Institute of Sensor and Actuator Systems, Floragasse 7/2, Vienna, Austria;1. School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, 710049, PR China;2. State Key Lab of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, PR China;1. Laboratory of Thermophysical Properties, Department of Applied Physics, Faculty of Physics, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain;2. Wilhelm Ostwald Institute for Physical and Theoretical Chemistry, Leipzig University, Linnéstr. 2, 04103 Leipzig, Germany;2. Faculty of Materials Engineering and Mechanics, Valahia University,18-24 Unirii Boulevard, 130082, Targoviste, Romania;3. Academy for Technical Sciences from Romania, 118 Calea Victoriei, Bucharest, Romania;4. Faculty of Medicine, Titu Maiorescu University, 67A Gheorghe Petrascu Street, Bucharest, Romania;1. Department of Mechanical Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Kanagawa, Japan;2. Daido Chemical Industry Co., Ltd., Research & Development Department, 1021 Nukatabekitamachi, Yamatokoriyama 639-1037, Nara, Japan |
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| Abstract: | The tribological conditions of hot forming processes are much different from those at room temperature. Thus classical wear-resistant coating like CrN, CrAlN, TiAlN in most cases are not sufficient for hot forming tools in industrial applications.Additionally the use of lubricants is limited, thermal shock conditions and the increase of sticking work piece material are leading to severe wear.This paper presents examples for ternary boron based Ti–B–N gradient coatings in specific multilayer designs obtained through plasma enhanced chemical vapor deposition. After a thorough characterization of the chemical composition by Auger electron spectroscopy, the microstructure by X-ray diffraction and the mechanical properties by microindentation and small-angle cross section nanoindentation, the coatings were applied onto hot forming tools made from DIN 1.2367 tool steel. The coated tools were tested in hot forging of AISI 1043 raw parts in an automatic press and have been compared in terms of adhesion and wear resistance. In this study an optimum design has been found which significantly reduces sticking of work piece material and wear. This allows an efficient production without interruptions for a reworking of the tools and enables to increase the process reliability paired with a longer tool life. |
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