Metastable-Stable Phase Transformation Behavior of Al2O3 Scale Formed on Fe–Ni–Al Alloys

Hayashi, Shigenari; Takada, Yuto; Yoneda, Suzue; Ukai, Shigeharu

doi:10.1007/s11085-016-9628-x

Cited by 11 publications

(3 citation statements)

References 23 publications

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“…Intermediate is the transformation from the mentioned initial transient oxide to the one that satises said local equilibrium conditions. 7,[14][15][16][17][18][19][20][21][22] The properties of the transient oxide are indeed crucial for the alumina forming process, partial control of which may be gained by the so-called 3rd element effect. As rst observed in the Cu-Zn-Al system, 23 the 3rd element effect is understood to initiate and maintain formation of a protective a-Al 2 O 3 scale.…”

Section: Introductionmentioning

confidence: 99%

Transition metal attenuated mechanism for protective alumina formation from first principles

2018

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Section: Introductionmentioning

confidence: 99%

Transition metal attenuated mechanism for protective alumina formation from first principles

2018

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“…Fig. 4.9 shows the phase transformation behaviour of Al2O3 scale which formed on Fe-41.5Al (at.%), Ni-41Al-41Fe (at.%) and Ni-41.5Al (at.%) [44]. It was found that high iron content is beneficial and promotes the rapid transformation to α-Al2O3.…”

Section: Metastable and Stable Alumina Scale Formationmentioning

confidence: 98%

“…From the previous studies, the template effect is interpreted as a precipitation of α-Al2O3 from the transient Fe2O3 with Al2O3 saturation [35,[40][41][42][43]. Hayashi et al [44] studied the meta-stable phase transformation behaviour of Al2O3 scale on Fe-Ni-Al alloys. They found that the oxidation mass gain tended to be reduced with the increased iron content in the alloy.…”

Section: Metastable and Stable Alumina Scale Formationmentioning

confidence: 99%

CHAPTER 4 High Temperature Oxidation of Stainless Steels

Chandra-ambhorn

Hayashi

Latu-Romain

et al. 2020

SSP

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This chapter is dedicated to the description of high temperature oxidation of both chromia and alumina forming alloys. The defect structures of iron and chromium are firstly reviewed. The effects of elements on stainless steel oxidation behaviour are further addressed. For the chromia-forming stainless steel, the oxidation rate is reduced with the increased silicon content but not in a monotonic manner. Titanium and niobium can reduce breakaway oxidation of Fe–18Cr–10Ni austenitic stainless steel. Titanium can enhance the adhesion of scale to the Fe–18Cr by mechanical keying effect of TiO2 formed at the steel/scale interface. For the alumina-forming stainless steel, the formation of alumina and its transformation during oxidation are reviewed. Chromium can be added to reduce the critical aluminium content in the steels in order to form alumina at high temperatures. The addition of reactive elements with appropriate level can improve scale adhesion and reduce the steel oxidation rate. Refractory element like molybdenum can increase strength of material but also accelerate the oxidation rate of the steels containing reactive elements. The development of new alumina-forming austenitic alloy grades is finally described.

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The Oxidation Behaviors of NiCoCrAlY Coatings After Pre-Oxidation Treatment During High-Temperature Oxidation at 800 ℃ and 900 ℃

Negami,

Yamabe-Mitarai

2024

High Temperature Corrosion of mater.

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Thermal barrier coatings (TBCs) are essential for protecting the high-temperature components in gas turbines. However, the durability of TBCs is limited, and new technologies to improve their lifetime are necessary. This study focuses on the pre-oxidation treatment of the NiCoCrAlY bond coat in TBCs to reduce the growth rate of the thermally grown oxide (TGO) and improve the TBC lifetime. The mechanism of the TGO growth rate reduction by the pre-oxidation treatment of NiCoCrAlY was investigated. Oxidation behaviors of the surface of NiCoCrAlY coating samples with or without pre-oxidation treatment were evaluated in air at 800 °C and 900 °C. In-situ X-ray diffraction (XRD) measurements and isothermal oxidation tests were performed. The obtained results revealed that the growth rate of TGO is significantly suppressed by α-Al2O3 layer formed by the pre-oxidation treatment. The generation of γ-Al2O3 and θ-Al2O3, which are typically formed below 900 °C, was significantly reduced by pre-oxidation. It is suggested that this reduction suppresses of the TGO growth.

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Metastable-Stable Phase Transformation Behavior of Al2O3 Scale Formed on Fe–Ni–Al Alloys

Cited by 11 publications

References 23 publications

Transition metal attenuated mechanism for protective alumina formation from first principles

Transition metal attenuated mechanism for protective alumina formation from first principles

CHAPTER 4 High Temperature Oxidation of Stainless Steels

The Oxidation Behaviors of NiCoCrAlY Coatings After Pre-Oxidation Treatment During High-Temperature Oxidation at 800 ℃ and 900 ℃

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