Formation of Alumina-Aluminide Coatings on Ferritic-Martensitic T91 Steel

  • Rupesh Kumar Choudhary Materials Processing Division, Bhabha Atomic Research Centre, Mumbai, India.
  • Vivekanand Kain Materials Science Division, Bhabha Atomic Research Centre, Mumbai, India.
  • Rajendra Hubli Materials Processing Division, Bhabha Atomic Research Centre, Mumbai, India.

Abstract


In this work, alumina-aluminide coatings were formed on ferritic-martensitic T91 steel substrate. First, coatings of aluminum were deposited electrochemically on T91 steel in a room temperature AlCl3-1-ethyl-3-methyl imidazolium chloride ionic liquid, then the obtained coating was subjected to a two stage heat treatment procedure consisting of prolonged heat treatment of the sample in vacuum at 300 ○C followed by oxidative heat treatment in air at 650 ○C for 16 hours. X-ray diffraction measurement of the oxidatively heat treated samples indicated formation of Fe-Al and Cr-Al intermetallics and presence of amorphous alumina. Energy dispersive X-ray spectroscopy measurement confirmed 50 wt-% O in the oxidized coating. Microscratch adhesion test conducted on alumina-aluminide coating formed on T91 steel substrate showed no major adhesive detachment up to 20 N loads. However, adhesive failure was observed at a few discrete points on the coating along the scratch track

Published
2014/12/17
How to Cite
Choudhary, R. K., Kain, V., & Hubli, R. (2014). Formation of Alumina-Aluminide Coatings on Ferritic-Martensitic T91 Steel. Journal of Mining and Metallurgy, Section B: Metallurgy, 50(2), 165. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/6497
Issue
Vol. 50 No. 2 (2014)
Section
Original Scientific Paper

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