Effect of Y2O3 dispersoids in 80Ni-20Cr alloy on the early stages of oxidation at low-oxygen potential

Braski, D.N.; Goodell, P.D.; Cathcart, J. V.; Kane, R. H.

doi:10.1007/bf00807995

Cited by 16 publications

(3 citation statements)

References 16 publications

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“…Thus the incorporation of yttrium oxide into the alumina scale leads to improved scale adherence, decreased scale growth and enhanced oxidation resistance for the alloy. Similar scale behavior has been reported for nickel base alloys that form protective chromia oxides (10)(11)(12)(13). This paper will characterize the oxidation and burner rig (sulfidation-oxidation) data obtained for these yttria-containing mechanically alloyed products.…”

Section: Introductionsupporting

confidence: 81%

High Temperature Corrosion Resistance of Mechanically Alloyed Products in Gas Turbine Environments

Smith

Fischer

1990

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation;

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The high temperature corrosion performance of the heat resistant, mechanically alloyed, oxide dispersion strengthened alloys, INCOLOY® alloy MA 956, INCONEL® alloy MA 754, INCONEL alloy MA 760 and INCONEL alloy MA 6000 is described in this paper. Oxidation and oxidation-sulfidation data for a range of temperatures and environmental conditions are presented, along with comparative data on five wrought alloys. Scale types are related to performance.

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Section: Introductionsupporting

confidence: 81%

High Temperature Corrosion Resistance of Mechanically Alloyed Products in Gas Turbine Environments

Smith

Fischer

1990

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation;

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“…These effects are observed when the yttrium is present as an alloying addition or as an oxide dispersion (1)(2)(3)(4)(5)(6). In addition, the mechanism of growth of Cr203 is changed from one involving predominant cation diffusion to one involving predominant anion diffusion, and the microstructure of the scale is changed.…”

mentioning

confidence: 99%

Grain Boundary Segregation of Yttrium in Chromia Scales

Przybylski

Garratt‐Reed

Yurek

1988

J. Electrochem. Soc.

139

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Implantation of a Co-45 weight percent Cr alloy with a high dose of yttrium causes the oxidation rate of the alloy to decrease by about 100 times at 1000~ in pure oxygen. Also, the mechanism of growth of the Cr203 scale changes from predominant cation diffusion to predominant anion diffusion, both of which occur along grain boundaries in the oxide. Segregation of yttrium ions to grain boundaries in the Cr203 scales has been measured using EDX analysis in a STEM, and the reduction in oxidation rate and the change in growth mechanism have been attributed to segregation of yttrium at the grain boundaries. Less than 2 volume percent of YCrOa particles have been found in a Cr2Oa scale after 25h of oxidation at 1000~ and it has been concluded that these particles do not have a significant effect on the oxidation mechanisms. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 193.140.21.152 Downloaded on 2014-12-21 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 193.140.21.152 Downloaded on 2014-12-21 to IP Vol. 135, No. 2 YTTRIUM IN CHROMIA SCALES 511 ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 193.140.21.152 Downloaded on 2014-12-21 to IP VoL. 135, No. 2 YTTRIUM IN CHROMIA SCALES 513

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“…However, this proposed mechanism is under debate and has been rejected by others [22], as no change can be seen between the oxidation behavior of a dispersoids-containing alloy and a free-dispersoids alloy at the early stages of oxidation exposure. Therefore, it is proposed that the dispersoids alter microstructure of the formed oxide by reducing the grain size which promotes inward diffusion of O 2-rather than outward diffusion of Cr 3+ through the oxide grain boundaries [22]. The dispersed oxides can lead to excellent scale adherence to the substrate material based on a mechanism known as "pegging effect" or "mechanical keying", as frequently reported by various authors [23], [24].…”

Section: Introductionmentioning

confidence: 99%

Effect of SiO2 Dispersion on Chlorine-Induced High-Temperature Corrosion of High-Velocity Air-Fuel Sprayed NiCrMo Coating

et al. 2018

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NiCrMo coatings with and without dispersed SiO2 were deposited using high velocity air-fuel (HVAF) technique. Thermogravimetric experiments were conducted in 5% O2+500 vppm HCl+N2 with and without a KCl deposit at 600 °C for up to 168 h. The SiO2-containing coating showed lower weight change due to formation of a protective and adherent Cr-rich oxide scale. SiO2 decelerated short-circuit diffusion of Cr 3+ through scale's defects, e.g., vacancies, and promoted the selective oxidation of Cr to form the protective Cr-rich oxide scale. Furthermore, the presence of SiO2 led to less subsurface depletion of Cr in the coating, and accordingly less corrosion of the substrate. The formed corrosion product on the SiO2-free coating was highly porous, non-adherent, and thick.

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Effect of Y2O3 dispersoids in 80Ni-20Cr alloy on the early stages of oxidation at low-oxygen potential

Cited by 16 publications

References 16 publications

High Temperature Corrosion Resistance of Mechanically Alloyed Products in Gas Turbine Environments

High Temperature Corrosion Resistance of Mechanically Alloyed Products in Gas Turbine Environments

Grain Boundary Segregation of Yttrium in Chromia Scales

Effect of SiO2 Dispersion on Chlorine-Induced High-Temperature Corrosion of High-Velocity Air-Fuel Sprayed NiCrMo Coating

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