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Comparative evaluation of hot corrosion resistance of nanostructured AlCrN and TiAlN coatings on cobalt-based superalloys

Published online by Cambridge University Press:  25 March 2018

Raghubeer Singh Bangari ,
Sandeep Sahu  and
Prabhat Chand Yadav
Raghubeer Singh Bangari*
Affiliation:
Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur-208016, India
Sandeep Sahu*
Affiliation:
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur-208016, India
Prabhat Chand Yadav*
Affiliation:
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur-208016, India
*
a)Address all correspondence to these authors. e-mail: raghubeersinghbangari@gmail.com, raghusb@iitk.ac.in
b)e-mail: ssandy@iitk.ac.in
c)e-mail: yadav@iitk.ac.in
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Abstract

Molten vanadate-induced hot corrosion is the major cause of failure of superalloys which are generally used at higher temperatures (such as in internal combustion engines, gas turbines, high temperature tooling and dies, and petrochemical industries and marines). This effect can be minimized by applying thermally stable coatings over the superalloy. In this aspect, the current work investigates the effect of nanostructured aluminum chromium nitride (AlCrN) and titanium aluminum nitride (TiAlN) coatings on the hot corrosion behavior of Co-based superalloy, Superco-605, in an aggressive environment of Na2SO4–60% V2O5 (ratio by weight) at 700 °C up to 80 cycles. Each cycle consisted of 1 h heating at 700 °C followed by 20 min cooling in an ambient temperature. Hot corrosion kinetics was studied using the thermogravimetric technique and found to follow the parabolic rate law. The corrosion surface morphology and phases formed during hot corrosion were studied using field emission scanning electron microscopy equipped with energy dispersive spectroscopy and X-ray diffraction techniques. It was found that AlCrN coating had a better hot corrosion resistance than TiAlN coating.

Keywords

protective coatinghot corrosionmolten saltSuperco-605
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 8 , 27 April 2018 , pp. 1023 - 1031
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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