Enhanced mechanical properties and microstructural modifications in electrodeposited Fe-W alloys through controlled heat treatments
Journal article, 2018

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.

electrodeposition

Reduced elastic modulus

Hardness

Heat treatments

EBSD

Fe-W alloys

Author

Aliona Nicolenco

Vilnius University

Antonio Mulone

Chalmers, Industrial and Materials Science, Materials and manufacture

Jordina Fornell

Universitat Autonoma de Barcelona (UAB)

Eva Pellicer

Universitat Autonoma de Barcelona (UAB)

Natalia Tsyntsaru

Vilnius University

Henrikas Cesiulis

Vilnius University

Jordi Sort

Universitat Autonoma de Barcelona (UAB)

Uta Klement

Chalmers, Industrial and Materials Science, Materials and manufacture

Surface and Coatings Technology

0257-8972 (ISSN)

Vol. 350 20-30

Smart ELECTrodeposited Alloys for environmentally sustainable applications: from advanced protective coatings to micro/nano-robotic platforms (SELECTA)

European Commission (Horizon 2020), 2015-01-01 -- 2018-12-31.

Subject Categories

Mechanical Engineering

Materials Engineering

Metallurgy and Metallic Materials

Driving Forces

Sustainable development

Areas of Advance

Materials Science

DOI

10.1016/j.surfcoat.2018.07.007

More information

Latest update

12/10/2018