Evaluation of Residual Stresses in PVD Coatings by Means of the Curvature Method of Plate

Harri Lille; Alexander Ryabchikov; Eron Adoberg; Liisa Kurissoo; Priidu Peetsalu; Liina Lind

doi:10.4028/www.scientific.net/KEM.721.404

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 721Evaluation of Residual Stresses in PVD Coatings by...

Evaluation of Residual Stresses in PVD Coatings by Means of the Curvature Method of Plate

Abstract:

Physical Vapor Deposition (PVD) coatings are primarily designed for metal cutting tools operating in extreme machining and blanking conditions. Residual stresses arising during coating deposition exert an important effect on the service life of the coating through influencing mechanical and tribological properties and adhesion. To determine macroscopic residual stresses, the conventional curvature method was used. As an application, residual stresses in four aluminum based PVD hard coatings, i.e. AlTiN, AlTiSiN, AlCrN, and AlCrSiN, were investigated in the presence of the Ti adhesion layer. Nickel steel plates and steel plates were used as the substrate. Residual stresses were compressive and high (3.0-7.5 GPa) in all coatings. Compressive stresses in coatings are desirable in cohesive tool damage as they strengthen the coating. The values of residual stresses were not significantly dependent on the angle of plate placement (parallel (0°), inclined (45°) and perpendicular (90°)) in relation to the PVD cathode in the deposition chamber. The magnitude of residual stresses is influenced by intrinsic strain at layer growth rather than by thermal stress.

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Key Engineering Materials (Volume 721)

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404-408

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https://doi.org/10.4028/www.scientific.net/KEM.721.404

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Online since:

December 2016

Authors:

Harri Lille*, Alexander Ryabchikov, Eron Adoberg, Liisa Kurissoo, Priidu Peetsalu, Liina Lind

Keywords:

Al Based Hard PVD Coating, Curvature Method, Residual Stresses

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