Corrosion behavior of Hastelloy C-276 in supercritical water

Zhang, Qiang; Tang, Rui; Yin, Kai; Luo, Xin; Zhang, Lefu

doi:10.1016/j.corsci.2009.05.041

Cited by 157 publications

(66 citation statements)

References 23 publications

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“…And after 500 h, tiny cracks appear on the surface of the oxide film, as shown in Figure 3(c). e results reported by Yin [23] also found the same phenomena of tiny microcracks on the surface of the oxide film on Alloy C-276 exposed to SCW. e composition of oxide film and oxide particles after 500 h is analyzed by EDS.…”

Section: Surface Topography Analysessupporting

confidence: 69%

Corrosion Behavior of Alloy C‐276 in Supercritical Water

Shi

Gao

Fan

et al. 2018

Advances in Materials Science and Engineering

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e corrosion behavior of Alloy C-276 in high-temperature and high-pressure water at 500°C and 25 MPa, respectively, was investigated by means of mass gain, scanning electron microscopic observation, and X-ray diffraction. e results indicated that the mass gain rate of Alloy C-276 in supercritical water obeys the parabolic law. e oxide scale was formed on Alloy C-276 with a dual-layer structure, mainly consisting of an outer Ni-rich layer and an inner Cr 2 O 3 /NiCr 2 O 4 mixed layer. Tiny microcracks can also be found in the oxide scale if exposed for longer time. Meanwhile, higher temperature promotes oxide rate and results in thermal stress in the oxide film.

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Section: Surface Topography Analysessupporting

confidence: 69%

Corrosion Behavior of Alloy C‐276 in Supercritical Water

Shi

Gao

Fan

et al. 2018

Advances in Materials Science and Engineering

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“…These materials are widely used in industrial gas turbines, space vehicles, rocket engines, nuclear reactors, submarines, stream production plants petrochemical devices, hot tools and glass industries [1]. Inconel 625 has been used in aqueous corrosive environments due to its excellent overall corrosion resistance [2]. Inconel 625 (Alloy 625) is a nickel-based super alloy strengthened mainly by the solidsolution hardening of the refractory metals, niobium and molybdenum, in a nickel-chromium matrix.…”

Section: Introductionmentioning

confidence: 99%

A comparative study on optimization of machining parameters by turning aerospace materials according to Taguchi method

Altın

2017

Int. J. Simul. Multisci. Des. Optim.

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-The effects of cutting tool coating material and cutting speed on cutting forces and surface roughness were investigated by Taguchi experimental design. Main cutting force, F z is considered as a criterion. The effects of machining parameters were investigated using Taguchi L 18 orthogonal array. Optimal cutting conditions were determined using the signal-to-noise (S/N) ratio which is calculated for average surface roughness and cutting force according to the ''the smaller is better'' approach. Using results of analysis of variance (ANOVA) and signal-to-noise (S/N) ratio, effects of parameters on both average surface roughness and cutting forces were statistically investigated. It was observed that feed rate and cutting speed had higher effect on cutting force in Hastelloy X, while the feed rate and cutting tool had higher effect on cutting force in Inconel 625. According to average surface roughness the cutting tool and feed rate had higher effect in Hastelloy X and Inconel 625.

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“…(1)(2)(3) Atualmente, a aplicação de superligas nos mais variados setores industriais é uma realidade. Especialmente como material resistente à corrosão, seu uso tem crescido principalmente nas indústrias nuclear e de petróleo e gás, tendo em vista que os benefícios causados pelo aumento da vida útil dos equipamentos e aumento da confiabilidade operacional podem superar os custos diretos relacionados à aplicação dessas ligas.…”

Section: Introductionunclassified

Migração De Molibdênio Na Interface Matriz/Precipitado Em Metais De Solda De Ligas Ni-Cr-Mo

Silva

Afonso

Miranda

et al. 2011

TMM

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ResumoO presente trabalho avalia a migração de elementos químicos, especialmente o molibdênio, na interface matriz/ precipitado de revestimentos de ligas Ni-Cr-Mo-W, depositados sobre substrato de aço C-Mn. A caracterização microestrutural foi realizada empregando-se as técnicas de microscopia eletrônica de varredura (MEV), microscopia eletrônica de transmissão (MET) e espectroscopia de energia dispersiva de raios X (EDS). Indícios de empobrecimento de molibdênio ao redor das fases secundárias são observados nas análises por MEV. Tais fases foram identificadas por MET como fase P. Análises de MET/EDS confirmam haver uma migração de molibdênio da matriz em direção aos precipitados. Comportamento semelhante é observado para o tungstênio. O fenômeno de migração de molibdênio e tungstênio é observado em cordões de solda que foram reaquecidos devido aos inúmeros ciclos térmicos de soldagem para a formação da camada de revestimento. Palavras-chave: Migração; Molibdênio; Superligas; Metal de solda. MIGRATION OF MOLIBDENUM ON MATRIX/PRECIPITATE INTERFACE IN Ni-Cr-Mo WELD METALS AbstractThis work evaluates the chemistry elements distribution on matrix/precipitate interface in a Ni-Cr-Mo-W alloy weld metals deposited on substrate of C-Mn steel. Microestructural characterization was carried out through optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS) techniques. The results have shown that the presence of secondary phases precipitates in the interdendritic region. Through SEM analysis indications of migration of molybdenum around these phases are observed. These precipitates are identified as P-phase by TEM analysis. The molybdenum migration along matrix/precipitate interface is confirmed through EDS. The phenomenon of molybdenum migration is a result of a re-heating due to several welding heat cycles deposited to promote the coating layer.

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Corrosion behavior of Hastelloy C-276 in supercritical water

Cited by 157 publications

References 23 publications

Corrosion Behavior of Alloy C‐276 in Supercritical Water

Corrosion Behavior of Alloy C‐276 in Supercritical Water

A comparative study on optimization of machining parameters by turning aerospace materials according to Taguchi method

Migração De Molibdênio Na Interface Matriz/Precipitado Em Metais De Solda De Ligas Ni-Cr-Mo

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