The effect of oxygen content on the temperature dependent tribological behavior of Cr–O–N coatings

Ürgen, Mustafa; Ezirmik, Kadri Vefa; Şenel, Esat Can; Kahraman, Z.; Kazmanlı, Kürşat

doi:10.1016/j.surfcoat.2009.02.027

Cited by 25 publications

(20 citation statements)

References 24 publications

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“…2). The presence of oxygen played a softening role as it did also for other transition metal oxynitride coatings [18,19]. Hardness of the film decreased with the O 2 addition to the coating.…”

Section: Microstructure Of Coatingsmentioning

confidence: 68%

PVD coated hot work tool steels for tooling applications in semi-solid processing of steels

2010

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Semi-solid processing of metals combines the advantages of forging and casting for the shaping of metallic components. Having already matured into an industrial practice for Al and Mg alloys, this innovative forming technology could upgrade the market and provide lightweighting for forged steel parts. However, with process temperatures above 1250°C, the surface-to-interior temperature differentials in steel thixoforming dies are much larger than with Al and Mg. Combined with the erosive wear caused by abrasion and impact of the already solid particles in the slurries and high temperature oxidation of the die surface, these cyclic thermal stresses confer very specific requirements on tool materials. Hot work tool steel dies proved to be entirely inadequate when thixoforming steels, due basically to the limited temper resistance of the commercially available grades. Physical Vapour Deposition (PVD) hard coatings, shown to have beneficial impact on the lifetime of pressure die casting tools, could offer a solution. X32CrMoV33 hot work tool steel widely used in the manufacture of conventional forging dies was coated with PVD AlTiN and AlTiON in the present work. The performance of the coated samples was subsequently tested under thermal fatigue conditions encountered in the thixoforming of steels.

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Section: Microstructure Of Coatingsmentioning

confidence: 68%

PVD coated hot work tool steels for tooling applications in semi-solid processing of steels

2010

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“…Oxygen in the AlTiON coating evidently played a softening role, as was reported for other transition metal oxy-nitride coatings. [45][46][47] Both coatings maintain the same NaCl structure with a fraction of the Ti atoms substituted by Al atoms. [48,49] The coating characterization work is reported elsewhere.…”

Section: Resultsmentioning

confidence: 99%

High-Temperature Sliding Wear Testing of Cathodic Arc Physical Vapor Deposition AlTiN- and AlTiON-Coated Hot Work Tool Steels

Birol

İsler

Ürgen

2010

Metall Mater Trans A

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Thin hard coatings provide the much needed protection for steel thixoforming tools that must resist wear at high temperatures. The wear resistance of AlTiN-and AlTiON-coated hot work tool steel was investigated at 1023 K (750°C), measured to be the cavity surface temperature shortly after the steel slurry was forced into the thixoforming die. The wear tests were repeated in exactly the same fashion with uncoated tool steel samples to identify the impact of AlTiN and AlTiON coatings on the high-temperature wear performance of X32CrMoV33 tool steel. The nature, the thickness, and the adherence of the oxide scales impact the tribological behavior. The poor adherence and limited ductility of ferrous oxides promote the failure of the oxide scale impairing the resistance to wear of the hot work tool steel at elevated temperatures. The substantial softening in the X32CrMoV33 hot work tool steel is also critical in the wear volume loss it suffers. AlTiN and AlTiON coatings, on the other hand, form a stable and protective oxide surface layer at high temperatures and therefore provide an enhanced resistance to oxidation. The latter is relatively more resistant to oxidation and is thus the better of the two coatings tested in the present work.

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“…The integration time was adjusted as a function of the laser power and for a given power, kept constant for all experiments (ranging from 15 to 180 s for the lowest laser power). All these experimental conditions have been chosen in agreement with published works on CrN and Cr 2 O 3 thin films [10,23,24] using similar experimental set-ups (laser wavelength, objectives. .…”

Section: Micro-raman Spectroscopymentioning

confidence: 99%

Estimation of the stress relief induced in CrN thin films by buckling

Lamri

Langlade

Kermouche

et al. 2010

Materials Science and Engineering: A

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The effect of oxygen content on the temperature dependent tribological behavior of Cr–O–N coatings

Cited by 25 publications

References 24 publications

PVD coated hot work tool steels for tooling applications in semi-solid processing of steels

PVD coated hot work tool steels for tooling applications in semi-solid processing of steels

High-Temperature Sliding Wear Testing of Cathodic Arc Physical Vapor Deposition AlTiN- and AlTiON-Coated Hot Work Tool Steels

Estimation of the stress relief induced in CrN thin films by buckling

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