Influence of prior cyclic oxidation on high temperature low cycle fatigue life of bare and Pt-Al coated superalloy Rene®80

Abstract

The prediction of fatigue life of metallic alloys is justly accepted as one of the most important phenomena in the field of metallurgical and mechanical engineering. At elevated temperatures, oxidation of the surfaces has an effective role in the fatigue strength and ductility of the alloys. In the present work, the effect of prior cyclic oxidation on the high temperature low cycle fatigue (HTLCF) properties of nickel-based superalloy Rene®80 has been assessed in the uncoated state and in the Pt-aluminide (Pt-Al) coated condition at 930 °C. To apply cyclic oxidation, simulation of engine thermal exposure was carried out by exposing coated and uncoated fatigue specimens in the burner rig (120 cycles at 1100°C). The cyclic oxidation procedure led to a changing in the coating microstructure from the dual-phase (ξ-PtAl₂ + β-(Ni, Pt) Al) to single phase (β-(Ni, Pt)Al). Results of HTLCF tests showed an improvement in the HTLCF life around 11.5% in the unexposed coated specimen (pre-cyclic oxidation) as compared to unexposed bare specimen, while this rise for exposed coated specimen (post-cyclic oxidation) was only 5%. Although a mixed mode fracture morphology (ductile and brittle) was observed on the fracture surfaces of failed specimens, the wider regions of brittle fracture belonged to exposed coated/uncoated ones.

Keywords

Rene®80 superalloy / Pt-aluminide / cyclic oxidation / low cycle fatigue / fractography

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