Effect of a Thin Hard Chromium Coating on Fatigue Behaviour Of 4140 Steel
| Autor: | J.A. Berrios-Ortiz, C. Marino-Berroteran, Eli S. Puchi-Cabrera, Gérard Mesmacque, M.J. Ortiz-Mancilla |
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| Přispěvatelé: | Laboratoire de Mécanique de Lille - FRE 3723 (LML), Université de Lille, Sciences et Technologies-Ecole Centrale de Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Université de Lille, Sciences et Technologies-Centrale Lille-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2004 |
| Předmět: |
FATIGUE LIFE
Materials science NIP COATING 02 engineering and technology Substrate (electronics) HARD CR REPLACEMENT engineering.material 01 natural sciences FRACTURE SURFACE Coating 0103 physical sciences Materials Chemistry FATIGUE LIMIT 010302 applied physics Metallurgy Fatigue testing Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics Fatigue limit Surfaces Coatings and Films FATIGUE PROPERTIES HARD CR COATING Hard chromium Crack initiation Fracture (geology) engineering 4140 STEEL SUBSTRATE 0210 nano-technology |
| Zdroj: | Surface Engineering Surface Engineering, Maney Publishing, 2004, 20, pp.345-352. ⟨10.1179/026708404225020233⟩ |
| ISSN: | 1743-2944 0267-0844 |
| DOI: | 10.1179/026708404225020233 |
| Popis: | The fatigue properties of a quenched and tempered (Q&T) 4140 (NiCrMo) steel coated with a hard Cr deposit , ~7 mum thick were investigated. The fatigue properties of the coated specimens were evaluated in the as deposited condition. The results obtained showed that both fatigue life and fatigue limit are substantially reduced in comparison with the uncoated material. The reduction in fatigue life was computed from the Basquin parameters of the materials tested under different alternating stresses. It was shown that the fatigue life of the steel substrate can be reduced by up to 88%, whereas the fatigue limit can be reduced by, ~21%, as a consequence of the coating. SEM observations showed that the fatigue fracture of the coated specimens initiates at the substrate–deposit interface and that the coating remains well adhered to the substrate during fatigue testing. The fracture surfaces of the specimens tested showed multiple crack initiation sites which led to the conclusion that the coating acts as a crack source for the steel substrate. |
| Databáze: | OpenAIRE |
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