Effect of Cyclic Oxidation Exposure on Tensile Properties of a Pt-Aluminide Bond-Coated Ni-Base Superalloy |
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Authors: | Md Zafir Alam N Hazari Vijay K Varma and Dipak K Das |
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Affiliation: | (1) Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad, 500058, India;(2) Centre for Military Airworthiness & Certification, Bangalore, 560093, India |
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Abstract: | The tensile behavior of a directionally solidified (DS) Ni-base superalloy, namely, CM-247LC, was evaluated in the presence
of a Pt-aluminide bond coat. The effect of the thermal cycling exposure of the coated alloy at 1373 K (1100 °C) on its tensile
properties was examined. The tensile properties were evaluated at a temperature of 1143 K (870 °C). The presence of the bond
coating caused an approximately 8 pct drop in the strength of the alloy in the as-coated condition. However, the coating did
not appreciably affect the tensile ductility of the substrate alloy. The bond coat prevented oxidation-related surface damage
to the superalloy during thermal cycling exposure in air at 1373 K (1100 °C). Such cyclic oxidation exposure (up to 750 hours)
did not cause any further reduction in yield strength (YS) of the coated alloy. There was a marginal decrease in the ultimate
tensile strength (UTS) with increased exposure duration. Because of the oxidation protection provided by the bond coat, the
drastic loss in ductility of the alloy, which would have happened in the absence of the coating, was prevented. |
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