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  Residual stresses and thermal fatigue in CrN hard coatings characterized by high-temperature synchrotron X-ray diffraction

Kirchlechner, C., Martinschitz, K. J., Daniel, R., Klaus, M., Genzel, C., Mitterer, C., et al. (2010). Residual stresses and thermal fatigue in CrN hard coatings characterized by high-temperature synchrotron X-ray diffraction. Thin Solid Films, 518(8), 2090-2096. doi:10.1016/j.tsf.2009.08.011.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-239B-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-239D-3
Genre: Journal Article
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 Creators:
Kirchlechner, C.1, Author              
Martinschitz, K. J.2, Author              
Daniel, R.3, Author              
Klaus, M.4, Author              
Genzel, C.4, Author              
Mitterer, C.3, Author              
Kečkéš, J.1, Author              
Affiliations:
1Department of Materials Physics, Montanuniversität Leoben, Leoben, Austria, ou_persistent22              
2Department of Materials Physics, University of Leoben, Erich Schmid Institute for Materials Science, Austria, ou_persistent22              
3Department of Physical Metallurgy and Materials Testing, University of Leoben, Christian-Doppler Laboratory for Advanced Coatings, Austria, ou_persistent22              
4Helmholtz Zentrum Berlin für Materialien und Energie, Glienicker Str. 100, 14109 Berlin, Germany, ou_persistent22              

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 Abstract: The aim of this work is to analyze thermal fatigue in hard coatings/substrate composites (i) during slow heating and cooling and (ii) after local cyclic thermal laser pulse experiments. As a model system, CrN coatings with a thickness of 3 μm deposited on steel, hard metal and Si(100) substrates using reactive magnetron sputtering at a temperature of 350 °C are used. The coatings are at first characterized by means of in-situ high-temperature X-ray diffraction (XRD) using a commercially available temperature attachment and by applying heating and cooling rates of less than 0.3 °C/s. The treatment results in the expected reduction of intrinsic stresses which are independent of substrate material but strongly influenced by substrate roughness. To simulate local thermal fatigue, selected coating/substrate composites are thermally cycled using a laser beam of 6 mm in diameter in a temperature range of 50–850 °C applying up to 104 cycles and using heating and cooling rates of about 103 °C/s. Subsequently, laser cycled samples are analyzed using synchrotron XRD, scanning electron microscopy and focused ion beam technique. Laser pulses cause a reduction of compressive stresses in the coatings and a development of tensile stresses in the substrates accompanied by formation of cracks and ripples. The results show that the changes of the local macro- and micro-strains/stresses in the coatings and in the underlying substrates are strongly interlinked. The stress relaxation in the coatings is caused by recovery effects, by micro-cracks formed in the tensely-stressed coating and by plastic deformation of the metallic substrates.

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 Dates: 2010-02-01
 Publication Status: Published in print
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 Identifiers: DOI: 10.1016/j.tsf.2009.08.011
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Title: Thin Solid Films
Source Genre: Journal
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Publ. Info: Lausanne, Switzerland, etc. : Elsevier
Pages: - Volume / Issue: 518 (8) Sequence Number: - Start / End Page: 2090 - 2096 Identifier: ISSN: 0040-6090
CoNE: /journals/resource/954925449792