Direct observation and analysis of the oxide scale formed on Y-treated austenitic stainless steels at high temperature

Fujikawa, Hisao; Morimoto, T.; Nishiyama, Yoshitaka

doi:10.1179/mht.2000.17.2.017

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…The oxidation mechanisms of Stellite 21 with and without yttrium were investigated using the 18 while the SIMS profiles of the yttrium-containing samples show that inward 18 O diffusion through the 16 O layer occurred during oxidation in the 18 O 2 environment, which was a result of the change in the oxidation mechanism from predominant outward cation diffusion to predominant inward anion diffusion.…”

Section: Resultsmentioning

confidence: 99%

“…Among these elements, yttrium and cerium perform most effectively [9]. There are several possible beneficial effects of yttrium on oxidation: (1) decreasing the oxide growth rate, particularly at temperatures close to 1,000°C [7,10], (2) improving the scale adherence to the substrate [11,12], (3) changing the oxidation mechanism from outward metal ions transport to inward oxygen ions transport [13,14], and (4) resulting in a finer grain microstructure of the oxide [15,16]. The effectiveness of the reactive elements seems to reach the maximum in a temperature range from 0.4 to 0.6 of the absolute melting temperature of the oxide scale and then decreases with a continuous decrease in temperature [17,18].…”

Section: Introductionmentioning

confidence: 99%

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A Further Study of the Beneficial Effects of Yttrium on Oxide Scale Properties and High-Temperature Wear of Stellite 21

Radu

2008

Tribol Lett

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Alloying yttrium to Co-based alloys has been proven to considerably improve their oxide scales that play an important role in resisting wear at elevated temperatures. In addition to the formation of Y 2 O 3 phase in the oxide scale, the yttrium addition may also change the oxidation mechanism, which could be responsible for many benefits of yttrium to the wear resistance of this alloy at elevated temperatures. In this study, the effect of yttrium on the oxidation behavior of Stellite 21 alloy was investigated and correlated to the changes in microstructure and improvement in properties of the oxide scale formed at 600°C which in turn improved high-temperature wear behavior.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Further Study of the Beneficial Effects of Yttrium on Oxide Scale Properties and High-Temperature Wear of Stellite 21

Radu

2008

Tribol Lett

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Understanding and Predicting Microevents Related to Scale Behavior and Formation of Subsurface Layers

Krzyżanowski

Beynon

Farrugia

2010

Oxide Scale Behavior in High Temperature Metal Processing

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Research the behavior of oxide scale on a metal surface during different kinds of deformation at elevated temperatures has mostly been motivated by a desire to better understand the microscopic events at the tool/workpiece interface that could infl uence heat transfer, friction, descalability, and surface fi nish during hot rolling operations. Direct observations of oxide scale behavior under industrial hot working conditions is very diffi cult, while it is not much easier in the laboratory. Any single experiment is not capable of representing the full range of phenomena taking place during this high -temperature processing. Hence, a range of techniques have been developed, each providing a partial insight. The experimental results have been interpreted numerically; then a physically based numerical model of the rolling operation has been developed and used to simulate the process. Detailed fi nite element analysis allowed for the consideration of scale evolution and also for detailed understanding of the microevents both during testing and technological operations. Some results obtained by this complex investigation are presented in this chapter. After relevant adjustment of the mathematical model, it gives a basis for better prediction of the technological operation providing corresponding design criteria. 8.

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High-Temperature Oxidation Behavior of Fe-Si-Ce Alloys

Zhang

et al. 2016

High Temperature Materials and Processes

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The oxidation behavior of Fe-Si-Ce alloys with different Ce content at 1,173 and 1,273 K has been studied by means of optical microscope (OM), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscope (SEM). Results show that the Ce addition refines the grain size of Fe-Si alloys, and correspondingly the grain size of the oxides decreases, which increases the grain boundary concentration and promotes the short-path diffusion of the alloying elements and oxygen. During oxidation, the positive effect of the grain refinement on the oxidation behavior of the alloy is more obvious than negative effect, so the Ce addition improves the oxidation resistances of the Fe-3Si alloys. Compared to Fe-3Si-0.5Ce alloy, Fe-3Si-5.0Ce alloy has the larger mass gain for the preferential oxidation of the excessive content of Ce exceeding its beneficial effects. The rare earth Ce changes the oxidation mechanism of Fe-Si alloys. Oxygen penetrates the oxide scales and reacts preferentially with Ce-rich phases, which results in the pinning effect and improves the adhesion of the oxide scales.

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Direct observation and analysis of the oxide scale formed on Y-treated austenitic stainless steels at high temperature

Cited by 3 publications

References 13 publications

A Further Study of the Beneficial Effects of Yttrium on Oxide Scale Properties and High-Temperature Wear of Stellite 21

A Further Study of the Beneficial Effects of Yttrium on Oxide Scale Properties and High-Temperature Wear of Stellite 21

Understanding and Predicting Microevents Related to Scale Behavior and Formation of Subsurface Layers

High-Temperature Oxidation Behavior of Fe-Si-Ce Alloys

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