Title: Study of the resistance to washout of PVD coated hot working tool steels

Authors: D. Ugues, E. Torres Miranda, M. Perucca, M. Albertinazzi, M. Rosso

Addresses: Politecnico di Torino, Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Cso Duca degli Abruzzi, 24, I 10129 Torino, Italy. ' Politecnico di Torino, Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Cso Duca degli Abruzzi, 24, I 10129 Torino, Italy. ' Clean NT Lab, Environment Park, Via Livorno, 58/60, I 10144 Torino, Italy. ' Teksid Aluminium srl, Via G. Agnelli, 60, 10022 Carmagnola (Torino), Italy. ' Politecnico di Torino, Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Cso Duca degli Abruzzi, 24, I 10129 Torino, Italy

Abstract: Wear and failure of die casting dies involve a complex interaction between various mechanisms. A CrAlSiN coating system was deposited on the base material, modulating the chemical composition of the chromium or the aluminium-silicon content. A set of the coated specimens was directly analysed through optical and electronic microscopy, so as to assess the overall quality. Other was subjected to a cyclic immersion program in molten aluminium bath. Coating efficiency was determined through electron microscopy analysis. Thermal fatigue was investigated, quantified. The transverse section of the specimens was polished to evaluate the microhardness changes occurred due to the thermal cycling.

Keywords: PVD ceramic coatings; aluminium die casting; washout resistance; soldering; modulated PVD composition; hot working; tool steels; casting dies; thermal fatigue; microhardness; microstructure; material properties; wear; failure.

DOI: 10.1504/IJMMP.2007.012943

International Journal of Microstructure and Materials Properties, 2007 Vol.2 No.1, pp.99 - 108

Available online: 31 Mar 2007 *

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