Development of 15CrODS ferritic steels for over 1273K service

Sawazaki, Yukiko; Ukai, Shigeharu; Sugino, Yoshito; Hayashi, Shigenari; Oono, Naoko; Hamajima, K.; Niwa, A.

doi:10.1016/j.jnucmat.2013.04.084

Cited by 10 publications

(2 citation statements)

References 5 publications

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“…Al is the element which coarsens oxide particles by forming incoherent Y-Al complex oxides [6][7][8], while Zr is the element which prevent coarsening oxide particles in Al added ODSS by forming coherent trigonal Y 4 Zr 3 O 12 [10] or pyrochlore Y 2 Zr 2 O 7 [11]. In the present study, however, the oxide particles in the 15Cr-7Al-0.4Zr become more than 10 nm coarser than those 15Cr-7Al after annealing at 1623 K for 100 h. Our result agrees with the previous study of Sawazaki et al [27]. Here we discuss the result in more detail.…”

Section: Coarsening Of the Oxide Particles At A High Temperaturesupporting

confidence: 92%

Growth of oxide particles in FeCrAl- oxide dispersion strengthened steels at high temperature

Oono

Ukai

Hayashi

et al. 2017

Journal of Nuclear Materials

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The growth of oxide particles in FeCrAl-oxide dispersion strengthened steel (ODSS) considering an accident condition of the light-water reactor at above 1500 K was studied by using a high-temperature annealing. Oxide particles grew from 9nm to more than 50nm as maximum at 1623K for 27h, with decreasing their number density in two orders of magnitude. Most of the oxide particles in 15Cr-7Al were identified as YAM or YAP, while the oxide particles in 15Cr-7Al-0.4Zr were identified trigonal Y 4 Zr 3 O 12. Zr addition to 15Cr-7Al ODSS accelerated the growth of the oxide particles, which is quite contrary to the effect of Zr addition during sintering as suggested in the literature. The kinetics of coarsening was characterized by an equation of Ostwald ripening. The diffusion activation energies obtained in the present materials were quite larger than the conventional diffusion activation energy of Y in alpha-iron. Gibbs free energy of oxides should be considered to discuss the coarsening.

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Section: Coarsening Of the Oxide Particles At A High Temperaturesupporting

confidence: 92%

Growth of oxide particles in FeCrAl- oxide dispersion strengthened steels at high temperature

Oono

Ukai

Hayashi

et al. 2017

Journal of Nuclear Materials

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“…In addition, when the reaction temperature is too high or exposure occurs for a long time, the decomposition reaction proceeds excessively, and amorphous coke is produced by the condensation polymerization reaction. Kubota Co., Ltd. (Osaka, Japan) developed a high-performance Fe-based oxide dispersion reinforced alloy (Fe-20Cr-4.5Al-0.5Ti-0.5Y2O3) that significantly increased the operation efficiency of thermal cracking furnaces due to the greatly exceeded coking resistance and anti-carburization performance [6]. The continuous operation period of newly developed cracking tubes carburized at 1100 • C for 300 h was more than twice (20 years) that of the conventional material.…”

Section: Introductionmentioning

confidence: 99%

Effects of Pre- and Post-Carburizing Surface Modification on the Tribological and Adhesion Properties of Heat-Resistant KHR 45A Steel for Cracking Tubes

Amanov

Choi²,

Pyun

2021

Materials

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In this study, the effects of ultrasonic nanocrystal surface modification (UNSM) technology on the tribological properties and scratch-induced adhesion behavior of a heat-resistant KHR 45A steel cracking tube, which is used for the pyrolysis process, were investigated. The main objective of this study is to investigate the effects of pre- and post-carburizing UNSM treatment on the tribological and adhesion performances of carburized domestic KHR 45A (A) steel and to compare the results with the existing carburized Kubota-made KHR 45A steel (B). A carburizing process was carried out on the polished and UNSM-treated KHR 45A steel substrates, which were cut out from the cracking tube, at 300 °C heat exposure for 300 h. The thickness of the carburizing layer was about 10 μm. UNSM technology was applied as pre- and post-carburizing surface treatment; both reduced the friction coefficient and wear rate compared to that of the carburized KHR 45A steel substrate. It was also found that the application of UNSM technology increased the critical load, which implies the improvement of adhesion behavior between the carburizing layer and the KHR steel substrate. The application of UNSM technology as pre- and post-carburizing surface treatment could help replace carburized Kubota-made KHR 45A steel (B) thanks to the improved tribological performance, enhanced scratch resistance, load bearing capacity, and adhesion of domestic KHR 45A (A) steel.

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Effect of Heat Treatment on Microstructure and Mechanical Properties of ODS Nickel-Based Superalloy via Strengthening Mechanism

Wang

Huang

Zhao

et al. 2020

JOM

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Development of 15CrODS ferritic steels for over 1273K service

Cited by 10 publications

References 5 publications

Growth of oxide particles in FeCrAl- oxide dispersion strengthened steels at high temperature

Growth of oxide particles in FeCrAl- oxide dispersion strengthened steels at high temperature

Effects of Pre- and Post-Carburizing Surface Modification on the Tribological and Adhesion Properties of Heat-Resistant KHR 45A Steel for Cracking Tubes

Effect of Heat Treatment on Microstructure and Mechanical Properties of ODS Nickel-Based Superalloy via Strengthening Mechanism

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