Fatigue Resistance and Crack Initiation Mechanisms in Nitrided Steel Treated with Selected Types of Surface Coating

Ivo Černý; Dagmar Mikulová

doi:10.4028/www.scientific.net/MSF.730-732.203

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HomeMaterials Science ForumMaterials Science Forum Vols. 730-732Fatigue Resistance and Crack Initiation Mechanisms...

Fatigue Resistance and Crack Initiation Mechanisms in Nitrided Steel Treated with Selected Types of Surface Coating

Abstract:

Surface treatment processes are usually applied to improve surface characteristics and resistance. Particularly duplex processes like nitriding combined with nanostructured based coatings are considered as the most advanced ones, with a large application potential in automotive industry. An example is an application in gear wheels, where fatigue loading in gear teeth roots exists besides contact fatigue on teeth sides. Contact fatigue, has to be therefore well balanced with pure fatigue resistance. Some surface treatments leading to excellent contact properties, wear resistance and extremely low friction coefficient may reduce resistance to pure fatigue crack initiation and subsequent growth to premature failure. In the paper, results of an experimental programme aimed at evaluation of fatigue resistance at repeated loading of nitrided steel after application of two types of coating, (i) nanostructured C-layer deposited by a modified cathodic arc technique according to Microcoat patent and (ii) Cr-WC:H-DLC layer produced according to Hauzer patent [1], are presented and discussed. Fatigue tests were carried out using small samples with 2.1 mm diameter, with nitrided layer of 0.35 mm thickness. Tests were completed with fractographical analyses of initiation areas. Results and analyses showed that coating effects depended on the specific technology and parameters. The Cr-WC:H-DLC layer affected fatigue limit favourably unlike the Microcoat C-layer, which resulted in reduction of fatigue strength. A detailed analysis of recorded data during static tensile tests indicated an occurrence of significant surface and subsurface residual stresses with a strong possible effect on fatigue crack initiation mechanisms. A significant, unfavourable effect of inclusions in the subsurface layer was demonstrated.

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Materials Science Forum (Volumes 730-732)

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203-208

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https://doi.org/10.4028/www.scientific.net/MSF.730-732.203

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November 2012

Authors:

Ivo Černý, Dagmar Mikulová

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Fatigue Crack Initiation, Fatigue Resistance, Nitriding, PVD Coatings

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References

[1] Application for US Patent number: 12/087,824, Publication number: US 2009/0202790 A1, Filing date: Jan 5, (2007)

Google Scholar

[2] S. Stewart, R. Ahmed, Rolling contact fatigue of surface coatings – a review, Wear, 253 (2002), 1132-1144.

DOI: 10.1016/s0043-1648(02)00234-x

Google Scholar

[3] S. Baragetti, G.M. La Vecchia, A. Terranova, Fatigue behaviour and FEM modelling of thin-coated components, Int. J. Fatigue, 25 (2003), 1229-1238.

DOI: 10.1016/j.ijfatigue.2003.08.009

Google Scholar

[4] P.L. Liu, J.K. Shang, O.O. Popoola, Fatigue behavior of a thermally sprayed low carbon steel coating, Mater. Sci. Eng. A, 277 (2000), 176-182.

DOI: 10.1016/s0921-5093(99)00558-4

Google Scholar

[5] P. Schlund, P. Kindermann, H.-G. Sockel, U. Schleinkofer, W. Heinrich, K. Görting, Mechanical behaviour of PVD- and CVD-coated hard metals under cyclic loads, Int. J. Refract. Met. H., 17 (1999), 193-199.

DOI: 10.1016/s0263-4368(99)00010-4

Google Scholar

[6] P. Schlund, P. Kindermann, R. Schulte, H. G. Sockel, U. Schleinkofer, K. Görting, W. Heinrich, Mechanical behaviour of PVD/CVD-coated hard metals under cyclic loads, Int. J. Refract. Met. H., 17 (1999), 179-185.

DOI: 10.1016/s0263-4368(99)00009-8

Google Scholar

[7] I.A. Polonsky, T.P. Chang, L.M. Keer, W.D. Sproul, A study of rolling-contact fatigue of bearing steel coated with physical vapor deposition TiN films: Coating response to cyclic contact stress and physical mechanisms underlying coating effect on the fatigue life, Wear, 215 (1998) 191-204.

DOI: 10.1016/s0043-1648(97)00256-1

Google Scholar

[8] R. Ahmed, M. Hadfield, Experimental measurement of the residual stress field within thermally sprayed rolling elements, Wear, 209 (1997) 84-95.

DOI: 10.1016/s0043-1648(97)00009-4

Google Scholar

[9] http://www.hauzertechnocoating.com/index/EN/Overview/79/0/

Google Scholar

[10] K.R. Kim, C.M. Suh, R.I. Murakami, C.W. Chung, Effect of intrinsic properties of ceramic coatings on fatigue behavior of Cr–Mo–V steels, Surf. Coat. Tech., 171 (2002), 15-23.

DOI: 10.1016/s0257-8972(03)00229-9

Google Scholar