Bond strength between TiN coating and microstructural constituents of a high speed steel determined by first principle calculations

Matthias Gsellmann, Daniel Scheiber, Thomas Klünsner, Jakub Zalesak, Zaoli Zhang, Harald Leitner, Christian Mitterer, Gerald Ressel, Lorenz Romaner

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The adhesion of protective hard coatings to the substrate is one of the most important parameters that influence the performance of metal cutting tools. By a combination of high-resolution transmission electron microscopy and first principles modelling we determine the interface adhesion between a TiN hard coating and microstructural constituents of a high speed steel on an atomic level for the first time. Based on experimentally observed orientation relationships, multiple structures are studied for each interface and both interface cohesion and resistance to sliding are evaluated for MC and M 6C carbides as well as the martensitic matrix to TiN coating. We find that TiN coatings have high adhesion to MC carbides, while lower adhesion is present for M 6C and the martensitic matrix. Close agreement with experimental measurements validates this approach and suggests new strategies for developing steels with increased coating adhesion.

Original languageEnglish
Article number117439
Number of pages9
JournalActa materialia
Issue number1 January
Early online date24 Oct 2021
Publication statusPublished - 1 Jan 2022

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