Fracture mechanism of TiN coatings on Ti-6Al-4V substrates: Role of interfaces and of the residual stress depth profile

2021 ◽  
Vol 426 ◽  
pp. 127747
Author(s):  
E.J. Herrera-Jimenez ◽  
N. Vanderesse ◽  
E. Bousser ◽  
T. Schmitt ◽  
P. Bocher ◽  
...  
Keyword(s):  
Residual Stress ◽  
Depth Profile ◽  
Fracture Mechanism ◽  
Tin Coatings

Residual Stress Evaluation in TiN Coatings Used for Erosion Protection of Aerospace Components

2006 ◽  
Vol 524-525 ◽  
pp. 867-872 ◽  
Author(s):  
Mariusz Bielawski
Keyword(s):  
Residual Stress ◽  
Stress Relaxation ◽  
Thermal Stresses ◽  
Stress Evaluation ◽  
Tin Coatings ◽  
Steel Substrates ◽  
Temperature Correlations ◽  
Stress Accumulation ◽  
Deposition Conditions

A laser beam profilometry technique was used to investigate residual stress accumulation during TiN deposition and stress relaxation during post-deposition heat treatment. The test coatings were reactively sputtered on silicon and steel substrates using a UMS technique. TiN coatings, deposited at different bias and pressure levels, were evaluated for residual stress and microhardness. It was found that both the residual stress and the hardness were strongly affected by the coating deposition conditions. In addition, stress-temperature correlations were obtained by subjecting the coatings to temperature cycles up to 450°C. Stress-temperature plots revealed that the level of residual stress relaxation depended on deposition conditions and only coatings deposited at low ion bombardment could be fully annealed. The role of intrinsic and thermal stresses in the total residual stress in the coating/substrate system was also discussed.

Depth profile of residual stress in metal-ion implanted TiN coatings

1997 ◽  
Vol 92 (1-2) ◽  
pp. 135-141 ◽  
Author(s):  
David Rafaja ◽  
Václav Valvoda ◽  
Anthony J. Perry ◽  
James R. Treglio
Keyword(s):  
Residual Stress ◽  
Depth Profile ◽  
Metal Ion ◽  
Tin Coatings ◽  
Ion Implanted

A Study of the Role of Heterogeneities in the Initial Stages of Corrosion of Glazes Using Dynamic Imaging Microellipsometry (DIM)

1996 ◽  
Vol 462 ◽  
Author(s):  
B.E. McCarthy ◽  
P.B. Vandiver ◽  
J. Kruger
Keyword(s):  
Residual Stress ◽  
Dynamic Imaging ◽  
Corrosion Process ◽  
Ceramic Production ◽  
Stress Fields ◽  
Process Dynamic ◽  
Glazed Ceramic ◽  
Mechanical Factors

ABSTRACTCommon processes used in glazed ceramic production often result in a glaze with a heterogeneous microstructure. Heterogeneities may be due to residual batch materials, intentionally added colorants and opacifiers and/or the products of devitrification and phase separation. To study the effect of heterogeneities in the corrosion process, dynamic imaging microellipsometry was used in-situ in aqueous solutions to measure spatially and temporally resolved changes in the surface of glasses (model glazes). The measurements showed increased durability near inclusions. Residual stress fields surrounding the heterogeneities influenced the results. Decoupling of chemical and mechanical factors causing this increased durability was not possible.

Effect of Humidity on Wear of TiN Coatings: Role of Capillary Condensation

2018 ◽  
Vol 49 (12) ◽  
pp. 6084-6092 ◽  
Author(s):  
Sumanth Govindarajan Cadambi ◽  
Vikram Jayaram
Keyword(s):  
Capillary Condensation ◽  
Tin Coatings

scholarly journals Impact of grinding wheel specification on surface integrity and residual stress when grinding Inconel 718

2020 ◽  
pp. 095440542096120
Author(s):  
David Curtis ◽  
Holger Krain ◽  
Andrew Winder ◽  
Donka Novovic
Keyword(s):  
Residual Stress ◽  
Inconel 718 ◽  
Cubic Boron Nitride ◽  
Grinding Wheel ◽  
Stress Profile ◽  
Standard Equipment ◽  
Residual Stress Profile ◽  
Grinding Parameters ◽  
Stress Formation

The grinding process is often maligned by grinding burn; which refers to many unwanted effects, including residual stress formation. This paper presents an overview of the role of grinding wheel technologies in the surface response and residual stress formation of thin section Inconel 718. Using production standard equipment, conventional abrasive vitrified, and super abrasive electroplated wheel technologies were evaluated in initial comparative trials. Results revealed the dominant residual stress profiles, which manifested as measurable distortion and the thermo-mechanical impact of grinding, such as softening. Following this, a parametric study was carried out using cubic boron nitride super abrasive electroplated wheels to investigate the interaction of grinding parameters on the generated output. It was shown that at increased grinding aggressions, tensile stress regimes increased resulting in increased distortion magnitudes. The study highlights the importance of assessing residual stress formation when manipulating both wheel technologies and grinding parameters. It is envisaged that with additional assessment, a route to an engineered residual stress profile might be achieved.

scholarly journals Role of Steel Plate Thickness on the Residual Stress Formation and Cracking Behavior During Flame Cutting

2019 ◽  
Vol 50 (9) ◽  
pp. 4178-4192 ◽  
Author(s):  
Tuomas Jokiaho ◽  
Suvi Santa-aho ◽  
Pasi Peura ◽  
Minnamari Vippola
Keyword(s):  
Residual Stress ◽  
Steel Plate ◽  
Plate Thickness ◽  
Cracking Behavior ◽  
Stress Formation

scholarly journals Effect of Laser Rescanning on the Characteristics and Residual Stress of Selective Laser Melted Titanium Ti6Al4V Alloy

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 3940 ◽  
Author(s):  
Xiaojin Miao ◽  
Meiping Wu ◽  
Jitai Han ◽  
Haohao Li ◽  
Xiu Ye
Keyword(s):  
Residual Stress ◽  
Ti6al4v Alloy ◽  
High Tech ◽  
Complex Structures ◽  
Laser Melting ◽  
Average Residual ◽  
Metal Materials ◽  
Scanning Strategies ◽  
Ideal Process

The titanium Ti6Al4V alloy has excellent properties, and is one of the most important and widely used metal materials in the field of modern high-tech. Selective laser melting (SLM) is an ideal process for the rapid prototyping of Ti6Al4V alloy components with complex structures, but the performances need to be further improved. In this paper, the relative density, hardness, and microstructure under different scanning conditions were first analyzed in order to clarify the role of rescanning process in improving the performances. Then, the effects of different scanning strategies on the residual stress were analyzed. The results show that the strategy of partition rescanning has the most significant effect on residual stress. Finally, the SLM experiments of aviation nozzle rings were carried out. The results show that the average residual stress of the Re-SLMed sample was reduced from 322 MPa to 254 MPa.

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