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 |
|
|