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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
Author(s) -
Röttger Arne,
Weber Sebastian,
Theisen Werner,
Rajasekeran Balasundaram,
Vaßen Robert
Publication year - 2011
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201000199
Subject(s) - materials science , coating , diffusion , indentation hardness , metallurgy , substrate (aquarium) , phase (matter) , thermal spraying , austenite , work (physics) , composite material , microstructure , mechanical engineering , physics , oceanography , chemistry , organic chemistry , engineering , thermodynamics , geology
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.