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
Related Articles
- EP ID EP429668
- DOI 10.32730/imz.0137-9941.18.2.02
- Views 88
- Downloads 0
LABORATORY STUDIES ON THE DEVELOPMENT OF COMPOSITE PELLETS FOR DEEP REFINING OF STEEL FROM NON-METALLIC INCLUSIONS
The paper presents the laboratory research on the development of a new type of refining materials in the form of composite pellets for deep refining of steel from non-metallic inclusions, measured by the total oxygen con...
EFFECT OF METALLURGIC PURITY OF THE 15CrMoV6-10-3 (15HGMV) STEEL ON TECHNOLOGICAL AND MECHANICAL PROPERTIES OF COLD-DEFORMED PRODUCTS
The subject of the article is the analysis of the impact of electro-slag remelting – ESR on the technological and mecha-nical properties of the 15HGMV steel. Uniaxial compression tests were carried out with the use of a...
Forecasting the development of the national construction market in terms of the economic crisis
The paper considers the main problems in the construction market in Ukraine economic crisis and analyzes the structural problems of the industry, studied the experience of transformation construction industries in oth...
Гендерна політика у сфері вищої освіти: проблеми нерівності та шляхи їх вирішення.
У статті проведено аналіз гендерної нерівності у системі вищої освіти країни, виявлено наявну горизонтальну та вертикальну сегрегації. Представлено статистичні відмінності щодо гендерного представ...
RESIDUAL LIFE OF REPAIR WELDED JOINTS IN PIPELINES MADE OF 13HMF AFTER USE FOR THE DESIGN OPERATING TIME
This paper presents the results of material tests of repair welded joints carried out for samples of materials taken from high pressure steam pipelines after over 200,000 operating hours in creep conditions, made of the...