Mechanical and tribological behavior of Ti/TiN and TiAl/TiAlN coated austempered ductile iron

Colombo, Diego Alejandro; Mandri, Alejo Daniel; Echeverría, María Dolores; Massone, Juan Miguel; Dommarco, Ricardo

doi:10.1016/j.tsf.2017.12.014

Cited by 25 publications

(5 citation statements)

References 33 publications

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“…Table 1 summarizes the results obtained using this technique. Accordingly, the aluminium fraction in the TiAlN coating is approximately 0.54, from which a cubic face centred NaCl lattice structure can be predicted [42,44]. Besides, the CrAlN chemical composition exhibits a higher aluminium fraction, 0.75.…”

Section: Resultsmentioning

confidence: 96%

Tribomechanical Behaviour of TiAlN and CrAlN Coatings Deposited onto AISI H11 with Different Pre-Treatments

et al. 2019

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In the metalworking industry, different processes and applications require the utilisation of custom designed tools. The selection of the appropriated substrate material and its pre-treatment as well as the protective coating are of great importance in the performance and life time of forming tools, dies, punches and coated parts in general. TiAlN and CrAlN coatings have been deposited onto the hot work tool steel AISI H11 by means of Direct Current Magnetron Sputtering. Prior to the deposition, the steel substrate was modified by the implementation of three different pre-treatments: nitriding of the annealed substrate [Nitr.], heat treatment of the steel (quenching and double tempering) [HT] and nitridation subsequent to a heat treatment of the substrate [HT + Nitr.]. The purpose of this research is to obtain valuable information on the microstructural properties and tribomechanical behaviour of two of the most promising ternary transition metal nitride coatings, TiAlN and CrAlN, when deposited on the AISI H11 steel with different initial properties. The different pre-treatments performed to the steel prior to the deposition favour the tailoring during the design and construction of tools for specific applications. The microstructure, the adhesion and the wear resistance of TiAlN coatings were highly influenced by the substrate preparation. Contrarily, CrAlN results were more independent of the substrate preparation and no high influences were found. For instance, the adhesion of the TiAlN coating varied from 17 to 43 N for the coating deposited onto the HT + Nitr. substrate and the HT substrate respectively, while the lowest and highest adhesion of the CrAlN coating varied between 42 and 53 N for the HT and the HT + Nitr. respectively. Likewise, the wear coefficient of the CrAlN were ten times smaller than those found for the TiAlN coatings, presumably due to the presence of hex-AlN phases and the small differences on the Young´s Modulus of the substrate and the CrAlN coatings.

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Section: Resultsmentioning

confidence: 96%

Tribomechanical Behaviour of TiAlN and CrAlN Coatings Deposited onto AISI H11 with Different Pre-Treatments

et al. 2019

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“…Finally, if the performance of the coatings deposited using the industrial device is compared, it can be seen that the critical loads of the TiAl/TiAlN are lower. According to previous studies [44,45], this behavior can be ascribed to a higher elastic modulus of the TiAl/TiAlN coating with respect to Ti/TiN, since a greater elastic modulus mismatch between substrate and coating increases the probability of coatings to suffer cracking and/or delamination under the effects of the plastic strain accumulated in ADI substrates during tests.…”

Section: Mechanical Behaviormentioning

confidence: 83%

Mechanical behavior of PVD coatings deposited on ADI

et al. 2019

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In this work, the mechanical behavior of the coated ADI system is studied. For this purpose, single layer Ti and bilayer Ti/TiN and TiAl/TiAlN coatings, with different thicknesses, were deposited by the PVD technique of cathodic arc deposition on high strength ADI substrates using industrial and experimental devices. The characterization of the coatings includes the measurement of the layer thicknesses by the spherical abrasion method, the determination of existing phases and residual stresses by x-ray diffraction and the evaluation of the surface topography using a stylus profilometer. The analysis of the mechanical properties of the coatings comprises the measurement of the surface hardness by micro indentation tests and the evaluation of the scratch resistance. The scratch tests were performed on a scratch tester equipped with a Rockwell indenter. A progressive load from 1 to 100 N, a load rate of 99 N/min, a speed of 5 mm/min and a scratch length of 5 mm were employed. The influence of the coatings characteristics on the scratch resistance of the coated samples and the friction coefficients obtained are evaluated. The results show that Ti coated samples had tensile residual stresses, the lowest surface hardness and the lowest critical loads for scratch adhesion strength. The samples coated with Ti/TiN and TiAl/TiAlN had highly compressive residual stresses and the highest critical loads, while the hardness was higher for TiAl/TiAlN. On the other hand, the evolution of the friction coefficient was similar for all the coated samples.

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“…However, the performance of Ti 1- x Al x N coatings depends strongly on their crystal structure which changes from cubic to hexagonal at an Al content x = 0.6 and causes a decrease in hardness and wear resistance [27–30]. The authors of the present work compared the wear behaviour, under lubricated rolling contact conditions, of ADI coated with TiN and TiAlN films deposited by CAD and by PBIID [31–33]. It was found that, under the deposition conditions used, TiN and TiAlN coatings grew with a cubic-NaCl type structure.…”

Section: Introductionmentioning

confidence: 99%

Sliding wear performance of TiAl-based nitride coatings deposited on ADI by cathodic arc deposition and plasma based ion implantation and deposition

Colombo

Quintana

Mandri

et al. 2022

Tribology - Materials, Surfaces & Interfaces

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This work studied the sliding wear performance of TiAl-based nitride coatings synthesized on austempered ductile iron (ADI) by cathodic arc deposition (CAD) and plasma-based ion implantation and deposition (PBIID). Monolayer CAD TiAlN films and bilayer CAD and PBIID TiAl/TiAlN films deposited on an experimental device were analyzed and benchmarked against a commercial bilayer CAD film. Sliding wear was evaluated in a pin-on-disc tribometer. Two test conditions were employed, one intended to prevent damage (low load, short distance) and another intended to promote damage (higher load, longer distance). Regarding low load tests, all coated samples showed friction coefficients of 0.40-0.45 and negligible wear. Regarding high load tests, all coated variants exhibited lower or equal disc and pin wear rates with respect to uncoated ADI. In addition, coated samples displayed steady-state friction coefficients between 0.2 and 0.6 while uncoated ADI steady-state coefficients between 0.6 and 0.85.

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Mechanical and tribological behavior of Ti/TiN and TiAl/TiAlN coated austempered ductile iron

Cited by 25 publications

References 33 publications

Tribomechanical Behaviour of TiAlN and CrAlN Coatings Deposited onto AISI H11 with Different Pre-Treatments

Tribomechanical Behaviour of TiAlN and CrAlN Coatings Deposited onto AISI H11 with Different Pre-Treatments

Mechanical behavior of PVD coatings deposited on ADI

Sliding wear performance of TiAl-based nitride coatings deposited on ADI by cathodic arc deposition and plasma based ion implantation and deposition

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