Influence of micro-blasting on the microstructure and residual stresses of CVD κ-Al2O3 coatings

SURFACE & COATINGS TECHNOLOGY

卷:203

Article

Barbatti, C.^2,3  Garcia, J.^1,4  Pitonak, R.⁵  Pinto, H.²  Kostka, A.²  Di Prinzio, A.⁶  Staia, M. H.⁶  Pyzalla, A. R.¹ 

[1] Mat & Energie GmbH, Helmholtz Zentrum Berlin, D-14109 Berlin, Germany

[2] Max Planck Inst Eisenforsch GmbH, D-40237 Dusseldorf, Germany

[3] Corus Res Dev & Technol, NL-1970 AB Ijmuiden, Netherlands

[4] Ruhr Univ Bochum, D-44780 Bochum, Germany

[5] Boehlerit GmbH & Co KG, R&D, A-8605 Kapfenberg, Austria

[6] Cent Univ Venezuela, Sch Met & Mat Sci, Caracas 1041, Venezuela

关键词: CVD;    kappa-Al2O3;    Cemented carbides;    Micro-blasting;    Residual stresses;    Synchrotron X-ray diffraction;   

DOI  :  10.1016/j.surfcoat.2009.06.021

来源: Elsevier

【 摘 要 】

Cemented carbides coated with CVD multilayers are commonly used in metal cutting turning and milling operations. For many applications, a micro-blasting finishing procedure based on an impact treatment of the surfaces is carried out in order to smooth the coated surface and reduce sharp cutting edges. In this work, micro-blasting with corundum in aqueous solution at pressures between 0.05 and 0.3 MPa was applied to CVD TiN/Ti(C,N)/kappa-Al2O3 multilayer coatings deposited onto cemented carbides in order to investigate its influence on the micro-topography, microstructure and residual stresses. The results showed that the micro-blasting reduces the surface roughness and affects the coating thickness. TEM investigations revealed no significant-changes on the microstructure of the kappa-Al2O3 top layer. Synchrotron X-ray investigations showed that the residual stress state of the as-deposited kappa-Al2O3 top layer is not affected by the micro-blasting treatment under the conditions investigated. (C) 2009 Elsevier B.V. All rights reserved.

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