Phase Structure Evolution of the Fe-Al Arc-Sprayed Coating Stimulated by Annealing

Tomasz Chmielewski; Marcin Chmielewski; Anna Piątkowska; Agnieszka Grabias; Beata Skowrońska; Piotr Siwek

doi:10.3390/ma14123210

Phase Structure Evolution of the Fe-Al Arc-Sprayed Coating Stimulated by Annealing

Materials (Basel). 2021 Jun 10;14(12):3210. doi: 10.3390/ma14123210.

Authors

Tomasz Chmielewski¹, Marcin Chmielewski², Anna Piątkowska², Agnieszka Grabias², Beata Skowrońska¹, Piotr Siwek¹

Affiliations

¹ Institute of Manufacturing Technologies, Warsaw University of Technology, Narbutta Str. 85, 02-524 Warsaw, Poland.
² Łukasiewicz Research Network-Institute of Microelectronics and Photonics, Al. Lotników 32/46, 02-668 Warsaw, Poland.

Abstract

The article presents the results of research on the structural evolution of the composite Fe-Al-based coating deposited by arc spray with initial low participation of in situ intermetallic phases. The arc spraying process was carried out by simultaneously melting two different electrode wires, aluminum and low alloy steel (98.6 wt.% of Fe). The aim of the research was to reach protective coatings with a composite structure consisting of a significant participation of Fe_xAl_y as intermetallic phases reinforcement. Initially, synthesis of intermetallic phases took place in situ during the spraying process. In the next step, participation of Fe_xAl_y fraction was increased through the annealing process, with three temperature values, 700 °C, 800 °C, and 900 °C. Phase structure evolution of the Fe-Al arc-sprayed coating, stimulated by annealing, has been described by means of SEM images taken with a QBSD backscattered electron detector and by XRD and conversion electron Mössbauer spectroscopy (CEMS) investigations. Microhardness distribution of the investigated annealed coatings has been presented.

Keywords: Fe-Al type intermetallics; arc sprayed coatings; phase synthesis.