Evaluation of Plasma Transferred Arc Fe-Al Alloyed Coatings

    Volume 9, Issue 2 (February 2012)

    ISSN: 1546-962X


    Published Online: 9 January 2012

    Page Count: 11

    Sippel, J. F.
    Universidade Federal do Paraná, UFPR,

    D’Oliveira, A. S. C. M.
    Universidade Federal do Paraná, UFPR,

    (Received 4 October 2010; accepted 10 December 2011)


    Industrial equipment operates under aggressive service conditions aiming at higher efficiencies. In order to attend these demanding operating conditions materials have been developed among which are the FeAl alloys. This work studied Fe-Al coatings developed in situ by the deposition of mixtures of powders by plasma transferred arc on AISI304 plates. The aim was to characterize the effect on the features of coatings of (a) 15 and 30 %wt Al in the deposited mixtures and (b) 18 % Cr and 8 % Ni both individually and together. Characterization included dilution and hardness measurements, microstructure analysis, and exposure at 650°C for 2 h in an air furnace. Abrasive sliding wear tests were used to classify the processed coatings. Coating hardness varied between 400 and 500 Hv0.3 and a columnar solidification structure developed in all coatings but on those processed with the Fe 30 wt% Al powder blend, which presented a dendritic structure. This microstructure evolved to a columnar structure following exposure to temperature. The complex powder mixtures containing FeAlCrNi resulted in a coating with a more stable response when exposed to 650°C and superior wear behavior, whereas coatings developed from the deposition of FeAl blends showed poorer stability and the highest normalized wear.

    Paper ID: JAI103454

    DOI: 10.1520/JAI103454

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    Title Evaluation of Plasma Transferred Arc Fe-Al Alloyed Coatings
    Symposium , 0000-00-00
    Committee B08