Martensite formation in Fe–9Cr alloys exposed to low carbon activity gas

Nguyen, Thuan Dinh; Zhang, Jianqiang; Young, David J.

doi:10.1016/j.scriptamat.2013.03.023

Cited by 15 publications

(1 citation statement)

References 10 publications

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“…As shown in Figure 18a, martensite was observed in Fe9Cr alloy after exposure to 800 • C/1 bar Ar-20%CO 2 for 20 h, which was a single ferritic phase before the reaction [33]. This is because the graphite or amorphous carbon layer can dissolve in ferritic alloys and transform ferrite into austenite at high temperature, which will transform into martensite at room temperature [33,105]. Moreover, it can also diffuse into the internal metal to form carbides, such as Cr 3 C, Cr 7 C 3 and Cr 23 C 6 , which pins the movement of Cr in chromedepletion zone and deteriorates the corrosion resistance of the alloy [106].…”

Section: Consequences Of Carburizationmentioning

confidence: 97%

Corrosion Behaviors of Heat-Resisting Alloys in High Temperature Carbon Dioxide

Yang¹,

Qian²,

Kuang³

2022

Materials

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The supercritical carbon dioxide Brayton cycle is a promising power conversion option for green energies, such as solar power and nuclear reactors. The material challenge is a tremendous obstacle for the reliable operation of such a cycle system. A large body of research indicates that high-temperature corrosion of heat-resisting alloys by CO2 results in severe oxidation and, in many cases, concurrent internal carburization. This paper mainly reviews the oxidation behavior, carburization behavior and stress corrosion behavior of heat-resisting alloys in high temperature CO2. Specifically, the main factors affecting the oxidation behavior of heat-resistant alloys, such as environmental parameters, surface condition and gaseous impurity, are discussed. Then, carburization is explored, especially the driving force of carburization and the consequences of carburization. Subsequently, the effects of the environmental parameters, alloy type and different oxide layers on the carburizing behavior are comprehensively reviewed. Finally, the effects of corrosion on the mechanical behavior and stress corrosion cracking behavior of heat-resisting alloys are also summarized. The corrosion performances of heat-resisting alloys in high temperature CO2 are systematically analyzed, and new scopes are proposed for future material research. The information provided in this work is valuable for the development of structural material for the supercritical carbon dioxide Brayton cycle.

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