INFLUENCE OF HAFNIUM ON HIGH TEMPERATURE OXIDATION OF NiAl AND Ni3Al ALLOYS

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INFLUENCE OF HAFNIUM ON HIGH TEMPERATURE OXIDATION OF NiAl AND Ni3Al ALLOYS

Journal Title: Prace Instytutu Metalurgii Żelaza - Year 2018, Vol 70, Issue 2

Abstract

The results presented in this paper concern the modification of NiAl and Ni3Al alloys with reactive elements that in-crease their high temperature oxidation resistance. Literature data indicate that even trace additions of Hf to aluminide coatings significantly improve the resistance to oxidation in the range of 1100–1150°C, however the exact mechanism of its influence is not yet known. In order to determine the influence of various additions of Hf on high temperature oxidation of aluminide coatings, cyclic oxidation tests were performed at 1150°C of model NiAl and Ni3Al alloys with different Hf additions – from 0.25 wt.% to 1.5 wt.%. High resolution electron microscopy, as well as chemical composition analysis techniques, were applied to perform a detailed characterisation of the influence of Hf on the substructure, chemical and phase composition in the nano scale of oxide scales formed during high temperature oxidation.

Authors and Affiliations

Radosław Swadźba

Keywords

OCENA STOPNIA WYEKSPLOATOWANIA MATERIAŁU WIRNIKÓW TURBIN PAROWYCH Z NISKOSTOPOWEJ STALI Cr-Mo-V PO EKSPLOATACJI W CZASIE ZNACZNIE PRZEKRACZAJĄCYM CZAS OBLICZENIOWY

Celem pracy była ocena stanu rozwoju procesów wydzieleniowych, wyznaczenie odpowiadającej mu prędkości pełzania i wyznaczenie odpowiadającego im stopnia wyczerpania badanych stali 23H2MF, 26H2MF oraz 21HMF po długotrwałe...

EP ID EP429668
DOI 10.32730/imz.0137-9941.18.2.02
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