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| Petrov, R. H. | Madrid |
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| Azevedo, Nuno Monteiro |
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Tuominen, J.
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Topics
Publications (12/12 displayed)
- 2023Coaxial Wire Laser-based Additive Manufacturing of AA7075 with TiC Nanoparticlescitations
- 2016Microstructural and abrasion wear characteristics of laser-clad tool steel coatingscitations
- 2016CMT - Nordic business opportunities from coating and additive manufacturing
- 2015Microstructural and abrasion wear characteristics of tool steel coatings manufactured by laser cladding
- 2015High performance wear and corrosion resistant coatings by novel cladding techniques
- 2015Fatigue behaviour of nickel- and cobalt-based laser cladded coatings on steel bars
- 2015Wear and corrosion resistant laser coatings for hydraulic piston rodscitations
- 2014Fatigue behavior of laser clad round steel barscitations
- 2013Stress raising in laser clad components depending on geometry and defects
- 2012Laser cladding with coaxial wire feeding
- 2012In vitro behaviour of three biocompatible glasses in composite implantscitations
- 2009Engineering coatings by laser cladding - the study of wear and corrosion properties
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document
Fatigue behaviour of nickel- and cobalt-based laser cladded coatings on steel bars
Abstract
Laser cladding allows the manufacturing of thick, dense and fusion bonded low diluted coatings, permitting its application in industry fields that require wear and corrosion protection. On the other hand, large residual stresses on the coating layer and noticeable changes in the substrate material may affect mechanical properties and fatigue strength. In this study, high load four-point bending fatigue tests were conducted, comparing the results to those of the substrate material alone and post-weld heat treated components. The fatigue test results were displayed with Wöhler curves. Two different substrate/coating couples are studied in this work: mild steel S355-J2 coated with Stellite21cobalt based hard-facing alloy, and low-alloy steel 42CrMo4 coated with Inconel625 nickel based super alloy. In order to better define how the features of the materials change with the cladding direction and the post weld heat treatment, the specimens were analysed by SEM/EDS; verifying the presence of defects, and how dilution changes along the cladding direction. Chemical etched samples were observed by optical microscope to assess the effect of the laser treatment on materials microstructures. Hardness measurements and depth sensing nanoindentations are performed to evaluate mechanical properties of coatings, HAZ and substrate. After fatigue failure, every fractured surface was separated from the fatigue specimen and analysed by stereo microscope, SEM and EDS in order to identify the reasons and the mechanisms of the failure.