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Diffusion and Phase Transformation at the Interface between an Austenitic Substrate and a Thermally Sprayed Coating of Ledeburitic Cold‐Work Tool Steel
Authors:Arne Röttger  Sebastian Weber  Werner Theisen  Balasundaram Rajasekeran  Robert Vaßen
Affiliation:1. Faculty of Mechanical Engineering, Institute for Materials, Chair of Material Technology, Ruhr‐University Bochum, Universit?tsstrasse 150, 44780 Bochum, Germany;2. Helmholz‐Zentrum Berlin für Materialien und Energie GmbH, Glienicker Strasse 100, 14109 Berlin, Germany;3. Institute for Materials Synthesis and Processing (IEF‐1), Institute of Energy Research, Research Centre Juelich, 52428 Juelich, Germany
Abstract:An overlay coating against wear or corrosion on components is required for various technical applications. Thermal spraying is a well‐established and near‐net‐shape deposition method. In this work, high‐velocity oxy‐fuel spraying of two different ledeburitic cold‐work tool steels was employed to produce wear‐resistant Fe‐base coatings on a stainless steel substrate. This work focuses on the investigation of diffusion processes across the coating/substrate interface. Specimens were heat‐treated for different dwell times and then analyzed by means of EBSD, XRD, OM, as well as SEM. Results of phase formation and diffusion profiles were compared with equilibrium and diffusion calculations obtained with ThermoCALC® and DICTRA®. The influence of diffusion processes across the coating/substrate interface on the mechanical properties, such as adhesive bond strength and hardness, was investigated by shear tests and microhardness profiles.
Keywords:thermal spraying  diffusion  heat treatment  bond strength  HVOF  cold‐work tool steel
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