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Search Results (3)

Search Parameters:
Keywords = alumina- and chromia-forming alloys

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14 pages, 2535 KiB  
Article
Oxidation Kinetics of FeCr and FeCrAl Alloys: Influence of Secondary Processes (Continuation)
by Irakli Nakhutsrishvili and Revaz Tevzadze
Alloys 2025, 4(1), 2; https://doi.org/10.3390/alloys4010002 - 27 Jan 2025
Viewed by 1455
Abstract
This paper discusses the influence of the secondary processes of reaction product evaporation and the reduction of the effective diffusion area into the scale on the kinetics (change in sample mass–time) of the high-temperature oxidation processes, in air, of alumina- and chromia-forming alloys. [...] Read more.
This paper discusses the influence of the secondary processes of reaction product evaporation and the reduction of the effective diffusion area into the scale on the kinetics (change in sample mass–time) of the high-temperature oxidation processes, in air, of alumina- and chromia-forming alloys. Full article
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15 pages, 7959 KiB  
Article
The Effects of Alloying Elements Cr, Al, and Si on Oxidation Behaviors of Ni-Based Superalloys
by Suyu Ma, Qingqing Ding, Xiao Wei, Ze Zhang and Hongbin Bei
Materials 2022, 15(20), 7352; https://doi.org/10.3390/ma15207352 - 20 Oct 2022
Cited by 30 | Viewed by 3401
Abstract
Oxidation behaviors of three Ni-based model alloys and pure Ni in the temperature range of 700–1200 °C are investigated to reveal effects of Cr, Al, and Si on the oxidation resistance of Ni-based superalloys. The formation and integrity of consecutive chromia or alumina [...] Read more.
Oxidation behaviors of three Ni-based model alloys and pure Ni in the temperature range of 700–1200 °C are investigated to reveal effects of Cr, Al, and Si on the oxidation resistance of Ni-based superalloys. The formation and integrity of consecutive chromia or alumina layers are important for excellent oxidation resistance. The addition of 20 at.% Cr can effectively improve the oxidation resistance of Ni-based alloys by forming a thin chromia film below 1000 °C, while adding 15 at.% Al has a beneficial effect on the oxidation resistance of Ni-based alloys at temperatures above 900 °C. The addition of 2 at.% Si to Ni-Al alloy is insufficient to form a protective SiO2 layer but can accelerate the formation of alumina, which enables Ni-Al alloy to form a consecutive inner alumina layer at a relatively low temperature of 800 °C and further improve the oxidation resistance above 800 °C. Full article
(This article belongs to the Special Issue Advances in Heat Resistant Alloys (Superalloys))
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31 pages, 7478 KiB  
Review
Research Progress of Alumina-Forming Austenitic Stainless Steels: A Review
by Ling Liu, Cuilin Fan, Hongying Sun, Fuxiao Chen, Junqing Guo and Tao Huang
Materials 2022, 15(10), 3515; https://doi.org/10.3390/ma15103515 - 13 May 2022
Cited by 30 | Viewed by 4492
Abstract
The development of Alumina-Forming Austenitic (AFA) stainless steel is reviewed in this paper. As a new type of heat-resistant steel, AFA steel forms an alumina protective scale instead of chromia in a corrosive environment. This work summarizes the types of developed AFA steels [...] Read more.
The development of Alumina-Forming Austenitic (AFA) stainless steel is reviewed in this paper. As a new type of heat-resistant steel, AFA steel forms an alumina protective scale instead of chromia in a corrosive environment. This work summarizes the types of developed AFA steels and introduces the methods of composition design. Various precipitates appear in the microstructure that directly determine the performance at high temperatures. It was found that alloy elements and the heat treatment process have an important influence on precipitates. In addition, the corrosion resistance of AFA steel in different corrosive environments is systematically analyzed, and the beneficial or harmful effects of different elements on the formation of alumina protective scale are discussed. In this paper, the short-term mechanical properties, creep properties and influencing factors of AFA steel are also analyzed. This work aims to summarize the research status on this subject, analyze the current research results, and explore future research directions. Full article
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