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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 3    March 2018

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In?uence of heat treatment on microstructure and tribological properties of flame spraying Fe–Ni–Al alloy coating
Youcef Mouadji1, Mohand Amokrane Bradai2, Rassim Younes2,Abdelhamid Sad-eddine2, Abderrahim Benabbas3

1. National Polytechnic School of Constantine, Department of Mechanical Engineering, University of Constantine, Constantine 25000, Algeria; 2. Laboratory of Mechanics, Materials and Energetic, Faculty of Technology, University of Bejaia,Bejaia 06000, Algeria; 3. Laboratory Processes for Materials, Energy, Water and Environment, Faculty of Science and Technology, University of Bouira, Bouira 10000, Algeria

Abstract:The Fe-based coatings in powder form were deposited on a steel type E335 by flame spraying technique. The effects of the post heat treatment on the microstructure and the mechanical properties of sprayed coatings were studied. Post heat treatment was conducted in a furnace in air at 623 K, 823 K and 1023 K for 1 h and then cooled in air. The results showed that with the increase of annealing temperature, the microstructure of coating treated at 823 K and 1023 K had several changes as follows: the reduction of porosity, formation of carbides and oxides. It was found that the solid solution FCC (Fe, Ni), intermetallic compound AlFe3 and carbides [Fe, C] were the main phases for coatings as-sprayed and treated at 623 K and while iron carbide, molybdenum carbide and oxide as Fe3O4 became the main phases and reinforced the solid solution FCC (Fe, Ni) phase for annealed coatings at 823 K. However, it was observed the disappearance of molybdenum carbide and oxide Fe3O4 at 1023 K. The coating annealed at 823 K exhibited an excellent wear resistance than the as-sprayed and annealed coatings at 623 K and 1023 K and shows the lower wear rate than another coating treated or as sprayed.

 

Key words: thermal spray; coatings; post heat treatment; microstructure; wear

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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