Enhanced mechanical properties and microstructural modifications in electrodeposited Fe-W alloys through controlled heat treatments
Mulone, Antonio (Chalmers University of Technology)
Nicolenco, Aliona (Vilnius University)
Fornell Beringues, Jordina (Universitat Autònoma de Barcelona. Departament de Física)
Pellicer Vilà, Eva Maria (Universitat Autònoma de Barcelona. Departament de Física)
Tsyntsaru, N. (Vilniaus Universitetas)
Cesiulis, Henrikas (Vilniaus Universitetas)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Klement, U. (Chalmers tekniska högskola)

Date:	2018
Abstract:	Among W alloys, Fe-W has seen much attention recently, due to the need of moving toward the design of environmentally friendly materials. Coatings with 4, 16 and 24 at. % of W were electrodeposited from an environmental friendly Fe(III)-based glycolate-citrate bath. The samples were annealed in vacuum at different temperatures up to 800 °C. Different crystalline phases are formed upon annealing: α-Fe, Fe2W, Fe3W3C, Fe6W6C, and FeWO4. Their grain size and distribution within the coating was studied by means of Electron Backscattered Diffraction (EBSD) technique. The effect of annealing on the mechanical properties of the coatings was analyzed performing nanoindentation measurements. The results show a considerable increase of the hardness followed by a rapid decrease at higher temperatures. The highest hardness value, i. e. 16. 5 GPa, is measured for the sample with 24 at. % of W after annealing at 600 °C owing to the precipitation of α-Fe crystallites. This study indicates the possibility to substantially increase the hardness of electrodeposited Fe-W coatings by optimization of the annealing treatment. In addition, the critical influence of the carbide and oxide phases on the mechanical properties of alloys is discussed. Hence, Fe-W coatings rich in W can be applied as a possible candidate for protective coating applications at elevated temperatures.
Grants:	European Commission 642642 Ministerio de Economía y Competitividad MAT2017-86357-C3-1-R Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-292 Ministerio de Economía y Competitividad IJCI-2015-27030 Ministerio de Economía y Competitividad RYC-2012-10839
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Electrodeposition ; Heat treatments ; Iron‑tungsten alloys ; EBSD ; Hardness ; Reduced elastic modulus
Published in:	Surface and coatings technology, Vol. 350 (September 2018) , p. 20-30, ISSN 0257-8972

DOI: 10.1016/j.surfcoat.2018.07.007

Postprint 16 p, 421.5 KB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3)
Articles > Research articles
Articles > Published articles