| 1. | Mróz K.P., Kucharski S., Doliński K., Bigos A.♦, Mikułowski G., Bełtowska-Lehman E.♦, Nolbrzak P.♦, Failure modes of coatings on steel substrate, BULLETIN OF THE POLISH ACADEMY OF SCIENCES: TECHNICAL SCIENCES, ISSN: 0239-7528, DOI: 10.1515/bpasts-2016-0027, Vol.64, No.1, pp.249-256, 2016 Abstract:The critical monotonic strain of Ni-W and MoS2(Ti,W) coatings on steel substrates was studied. The idea of axisymmetric bending test (called here as coin bending test) limited to monitoring of the coating failure was used. Experiments revealed mechanism of the coating failure, as cracking initiated from coating surface defects and/or substrate was demonstrated using indentation technique. By pushing the center of the uncoated side of a circular plate, the axisymmetric stress state was generated in the coating. The stress components varied gradually from the greatest value in the center to the smallest value at the edge of the specimen. The changes of the sample surface as a result of loading were monitored step by step via optical microscopy. Keywords:Ni-W coating, MoS2(Ti.W) coating, steel substrate, fracture, coatings strength, axisymmetric bending test Affiliations:| Mróz K.P. | - | IPPT PAN | | Kucharski S. | - | IPPT PAN | | Doliński K. | - | IPPT PAN | | Bigos A. | - | Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PL) | | Mikułowski G. | - | IPPT PAN | | Bełtowska-Lehman E. | - | Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PL) | | Nolbrzak P. | - | Lodz University of Technology (PL) |
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