scholarly journals Evaluation of Residual Stresses in PVD Coatings by means of Tubular Substrate Length Variation

2018 ◽  
Keyword(s):  
Residual Stresses ◽  
Length Variation ◽  
Pvd Coatings

Average Residual Stresses in Hard Physical Vapor Deposited (PVD) Coatings

2019 ◽  
Vol 799 ◽  
pp. 20-25
Author(s):  
Harri Lille ◽  
Alexander Ryabchikov ◽  
Jakub Kõo ◽  
Valdek Mikli ◽  
Eron Adoberg ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Front Surface ◽  
Back Surface ◽  
Length Variation ◽  
Pvd Coatings ◽  
Cross Sectional ◽  
Average Residual ◽  
Thin Walled ◽  
Compressive Residual Stresses ◽  
Very High

In this study we determined average residual stresses in hard nitride PVD AlCrN, TiAlN and TiCN coatings through simultaneous measurement of length variation in thin-walled tubular substrates and of the curvature of plate substrates. A device for measurement of the length of the tube was developed. Inside the depositing chamber the tube and the plate were fixed parallel in the relation to the axis of the rotating cathode. One batch of plate samples was produced by deposition on front surface (facing the cathode) and the other batch, by deposition on back surface (with back to the cathode). The cross-sectional microstructure and thickness of the coatings were investigated by means of scanning electron microscopy (SEM). The thicknesses of the coatings deposited on front and back surfaces of the plates and on the tube were significantly different. The values of average compressive residual stresses, determined by both methods, were very high irrespective of coating thickness. It was found that the values of compressive residual stresses in the coating were dependent on the shape of the substrate and on its position in the relation to the axis of the rotating cathode.

Evaluation of Residual Stresses in PVD Coatings by Means of Strip Substrate Length Variation and Curvature Method of Plate Substrate

2017 ◽  
Vol 267 ◽  
pp. 212-218 ◽  
Author(s):  
Harri Lille ◽  
Alexander Ryabchikov ◽  
Jakub Kõo ◽  
Eron Adoberg ◽  
Liina Lind ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Length Change ◽  
Steel Plates ◽  
Length Variation ◽  
Pvd Coatings ◽  
Compressive Stresses ◽  
Steel Strips ◽  
Middle Cross Section ◽  
Method Strip

The aim of the study was to determine macroscopic residual stresses in Physical Vapor Deposits (PVD) coatings through measurement of the length variation of the strip substrates coated on both sides. The length change of the strip was reduced to the deflection of the middle cross-section of the elastic element and was recorded by four strain gauges. For validating the obtained results, the conventional curvature method was used. As an application, residual stresses in hard AlCrN PVD coatings were investigated. The coatings were nanolayered to achieve better coating toughness for blanking and punching applications. The steel strips and steel plates with two thicknesses were used as the substrate. The values of the compressive residual stresses, determined by both methods for the investigated coatings, were very high (3.3 -3.6 GPa) independent of coating thickness and practically equal within the measurement uncertainty of the method. Good agreement between the experimental results obtained with both methods suggests that the presented method, strip length variation, is applicable for determination of residual stresses in coatings. Compressive stresses in coatings are desirable as they strengthen the coating.

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

2016 ◽  
Vol 721 ◽  
pp. 404-408 ◽  
Author(s):  
Harri Lille ◽  
Alexander Ryabchikov ◽  
Eron Adoberg ◽  
Liisa Kurissoo ◽  
Priidu Peetsalu ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Physical Vapor Deposition ◽  
Metal Cutting ◽  
Cutting Tools ◽  
Layer Growth ◽  
Hard Coatings ◽  
Steel Plates ◽  
Nickel Steel ◽  
Pvd Coatings ◽  
Mechanical And Tribological Properties

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.

Influence of substrate pre-treatments on residual stresses and tribo-mechanical properties of TiAlN-based PVD coatings

2014 ◽  
Vol 260 ◽  
pp. 369-379 ◽  
Author(s):  
Tobias Sprute ◽  
Wolfgang Tillmann ◽  
Diego Grisales ◽  
Ursula Selvadurai ◽  
Gottfried Fischer
Keyword(s):  
Mechanical Properties ◽  
Residual Stresses ◽  
Pvd Coatings ◽  
Influence Of Substrate

Evaluation of residual stresses in PVD-coatings. Part 2

2010 ◽  
Vol 42 (4) ◽  
pp. 450-458 ◽  
Author(s):  
O. B. Soroka ◽  
S. A. Klymenko ◽  
M. Yu. Kopeikina
Keyword(s):  
Residual Stresses ◽  
Pvd Coatings

Comparison of Curvature and X-Ray Methods for Measuring of Residual Stresses in Hard PVD Coatings

2011 ◽  
Vol 681 ◽  
pp. 455-460 ◽  
Author(s):  
Harri Lille ◽  
Jakub Kõo ◽  
Andre Gregor ◽  
Alexander Ryabchikov ◽  
Fjodor Sergejev ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Vapour Deposition ◽  
Layer Growth ◽  
Pvd Coatings ◽  
X Ray Diffraction ◽  
Adhesion Layer ◽  
X Ray ◽  
Mechanical And Tribological Properties ◽  
Ray Methods ◽  
Intrinsic Strain

Physical Vapour Deposition and PVD coatings are designed for several applications, from industrial to biomedical. Residual stresses, arising during coating deposition, have important effect on the coating’s service life as their influence to the mechanical and tribological properties. Our aim was to investigate the residual stresses in five different PVD coatings (TiN, TiCN, TiAlN, TiAlN, nc-(AlTi) N/α -Si3N4) (presence of the Ti as adhesion layer) by the layer growing curvature method and the X-ray diffraction techniques using a plate and a strip as the substrate. Residual stresses were compressive and very large (2.98 - 7.24) GPa in all coatings and comparable in TiN, TiAlN, TiAlN coatings in the case of both methods. The magnitude of residual stresses is influenced by intrinsic strain in the case of layer growth rather than by thermal stress.

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