Effect of ductile layers in mechanical behaviour of TiAlN thin coatings

Castanho, José M.; Vieira, M.T.

doi:10.1016/s0924-0136(03)00454-0

Cited by 75 publications

(24 citation statements)

References 17 publications

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“…Devillez et al [19] state that TiAlN coating imparts an excellent crater resistance. Additionally, Singh et al [20] and Castanho et al [21] show that the Al element incorporated in TiAlN coating forms the superficial layer Al 2 O 3 to improve the wear resistance and to enhance the chemical stability.…”

Section: Cemented Carbide Toolsmentioning

confidence: 99%

On the Physics of Machining Titanium Alloys: Interactions between Cutting Parameters, Microstructure and Tool Wear

Nouari

Makich

2014

Metals

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Abstract:The current work deals with the analysis of mechanisms involved during the machining process of titanium alloys. Two different materials were chosen for the study: Ti-6Al-4V and Ti-55531. The objective was to understand the effect of all cutting parameters on the tool wear behavior and stability of the cutting process. The investigations were focused on the mechanisms of the chip formation process and their interaction with tool wear. At the microstructure scale, the analysis confirms the intense deformation of the machined surface and shows a texture modification. As the cutting speed increases, cutting forces and temperature show different progressions depending on the considered microstructure (Ti-6Al-4V or Ti-55531 alloy). Results show for both materials that the wear process is facilitated by the high cutting temperature and the generation of high stresses. The analysis at the chip-tool interface of friction and contact nature (sliding or sticking contact) shows that machining Ti55531 often exhibits an abrasion wear process on the tool surface, while the adhesion and diffusion modes followed by the coating delamination process are the main wear modes when machining the usual Ti-6Al-4V alloy.

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Section: Cemented Carbide Toolsmentioning

confidence: 99%

On the Physics of Machining Titanium Alloys: Interactions between Cutting Parameters, Microstructure and Tool Wear

Nouari

Makich

2014

Metals

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“…The enhancement in the resistance under conditions of corrosive wear in a stainless steel-Ti/TiN-coating as compared to a single layer TiN-coating system is also explained by the diminishing of residual stresses and improvement of the substratecoating adhesion ability [41]. As is noted in [53], the adhesion provided by interlayers, such as those of Al, Ti or Cu located between a hard (Ti, Al)N-coating and a steel substrate, is improved with the decreasing modulus of elasticity of the interlayer material. It is shown [55] that it is reasonable to locate a titanium interlayer, which came to be known as a buffer one, not only between the coating and substrate but also inside the TiN-coating itself.…”

Section: Relationship Between Residual Stresses and The Mechanical Chmentioning

confidence: 81%

Evaluation of residual stresses in PVD-coatings. Part 1. Review

Soroka

2010

Strength Mater

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We present a review of the results of investigations on residual stresses in plasma-vacuum coatings obtained by the physical vapor deposition methods. The data on the character of residual stresses and factors influencing their values and distribution are analyzed. The works are considered that investigate the effect of residual stresses on the physico-mechanical characteristics of the substratecoating system. Recommendations on the further studies of residual stresses in PVD-coatings and the improvement in their level control are presented.Keywords: vacuum plasma coatings, residual stresses, thermal and structural components of stresses, reference potential, intermediate and buffer interlayers, multilayer coating, nanostructural and nanolayer coatings, discontinuous coating. Introduction.One of the peculiar features of modified surface layers of structural materials is the occurrence of residual stresses therein. Residual stresses in functional coatings affect the performance characteristics and life of parts and tools with coatings, as well as the strength characteristics of both the coating itself and the substrate-coating system. The account of these stresses is required, since the residual stresses promote or inhibit fracture processes, depending on the sign, distribution and mode of loading. Therefore, a strong need exists to correctly estimate the level of residual stresses, to reveal the reasons for their occurrence, to establish the manufacturing factors and parameters of the surface architecture that influence their value.The use of coatings obtained by the physical vapor deposition (PVD) method that has started in the sixties of the last century, is gaining further acceptance, particularly for parts and tools operating under conditions of heavy loads and high temperatures.The goal of the work is to review published investigations involving the defining of the physical nature and value of residual stresses in PVD-coatings, the revealing of the characteristics of the coating formation process and the parameters of the surface architecture that influence these stresses, and also the establishing of the relationship between the strength and wear resistance of the substrate-coating system and the level of residual stresses. We hope that this review will make it possible to state the problems and ways for further investigations on the residual stresses in PVD-coatings and to find the methods for attaining such "useful" level of these stresses that will agree with the maximum mechanical properties.Residual Stresses in PVD-Coatings: Value and Distribution, Physical Nature, and Dependence on Manufacturing Parameters. The occurrence of residual stresses is due to different factors, such as the difference in the coefficients of thermal expansion for the substrate and coating materials; the presence of the captured atoms of gas; the condensate imperfection, etc. Assumptions on the physical nature of residual stresses in PVD-coatings are somewhat different. In [1], using the X-ray method, it was determined that res...

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“…Since titanium has a good wettability with cemented cabide and also a good affinity to transition metal nitride coatings [15], a titanium buffer layer about 300 nm was deposited firstly to increase adhesion strength in this study. Adhesion strength of TiAlN (Titanium Aluminum Nitride) coatings with and without a titanium buffer layer was tested and the results are shown in Fig.…”

Section: A Buffer Layermentioning

confidence: 99%