The effect of platinum-aluminide coating features on high-temperature fatigue life of nickel-based superalloy Rene®80

  • Mohammad Mehdi Barjesteh Malek Ashtar University of technology (MUT), Metallic materials research center, Tehran 15875-1774, Iran.
  • Seyed Mehdi Abbasi
  • Karim Zangeneh Madar
  • Kourosh Shirvani

Abstract


Low cycle fatigue is the most important failure mode in Aviation/Industrial engine rotary turbine parts. In this paper, the influence of Pt-aluminide coating parameters on high temperature low cycle fatigue behavior of superalloy Rene®80 which is used to manufacture turbine blades, has been investigated. For this purpose, initial platinum layers of different thicknesses (2µm and 8µm) were coated on fatigue specimens. Then the aluminizing process was performed with two conditions of low temperature-high activity and high temperature-low activity. Results of microstructure investigations performed by scanning electron microscope and X-ray diffraction phase analysis indicated a three-layer structure for the coating (bi-phase (Ni,Pt)Al+PtAl2, singel-phase (Ni,Pt)Al and interdiffusion zone) with different chemical compositions at both thicknesses of the platinum layer and using both aluminizing methods. Also Results of low cycle fatigue tests at 871 °C, R=0 and strain rate of 2×10 -3 s-1 showed a decline in fatigue properties in coated specimens as compared to uncoated sample, at total strains of 0.4, 0.8, and 1.2%. This reduction was lower in the low temperature-high activity with platinum layer thickness of 2µm, while it was more significant in the high temperature-low activity with the platinum layer thickness of 8µm. The fractography studies on coated and uncoated specimens indicated a mixed mode of ductile and brittle fracture.


Published
2019/07/25
How to Cite
Barjesteh, M. M., Abbasi, S. M., Zangeneh Madar, K., & Shirvani, K. (2019). The effect of platinum-aluminide coating features on high-temperature fatigue life of nickel-based superalloy Rene®80. Journal of Mining and Metallurgy, Section B: Metallurgy, 55(2), 235. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/19908
Issue
Vol. 55 No. 2 (2019)
Section
Original Scientific Paper

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