High temperature molten salt corrosion investigations on P22/P91 power plant dissimilar welds:
01 Apr 2021-Vol. 235, Iss: 2, pp 440-451
TL;DR: In this article, the hot corrosion behavior of P22/P91 dissimilar welds used in power plant applications was investigated under the expo-constraint test setup.
Abstract: This article investigates the hot corrosion behavior of P22/P91 dissimilar welds used in power plant applications. The hot corrosion behavior of P22/P91 dissimilar welds was observed under the expo...
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09 Jun 2021
TL;DR: The P22/P91 dissimilar weld increasingly used in supercritical power plan boilers calls for experimental investigations on its properties for enhanced performance in high-temperature service condit....
Abstract: The P22/P91 dissimilar weld increasingly used in supercritical power plan boilers calls for experimental investigations on its properties for enhanced performance in high-temperature service condit...
2 citations
20 Dec 2022-Proceedings Of The Institution Of Mechanical Engineers, Part E: Journal Of Process Mechanical Engineering
TL;DR: In this paper , the authors investigated the cyclic corrosion characteristics of the bare and Ni-20%Cr, a high-velocity oxy-fuel sprayed coating on AISI 321 steel in Na2SO4-60%V2O5 salt atmosphere at 900 °C.
Abstract: The high-temperature corrosion is a crucial issue of stainless-steel components such as boilers and superheaters in power plant industries when it operates at elevated temperatures due to impurities in the environment, which deteriorate the properties of the materials. The current research work goal is to investigate the cyclic corrosion characteristics of the bare and Ni–20%Cr, a high-velocity oxy-fuel sprayed coating on AISI 321 steel in Na2SO4–60%V2O5 salt atmosphere at 900 °C. Thermogravimetric study was used to examine the corrosion kinetics by weight change technique. Surface morphology and compositions of the coating and oxide scale morphology were characterized. X-ray diffraction analysis divulges that Fe2O3 is the primary scale in the uncoated specimen. Corrosion attack across the depth and scale thickness is analyzed by a cross-sectional study. More oxide scales spalling could be observed in the uncoated specimen during the corrosion study due to nonprotective Fe2O3 formation. Compared with the bare specimen, the coated steel provides superior corrosion resistance at 900 °C. This is ascribed to the occurrence of NiO, NiCr2O4, and Cr2O3 scales in the coated specimen, which provides sufficient protection to the specimen.
1 citations
31 Mar 2023-Proceedings Of The Institution Of Mechanical Engineers, Part E: Journal Of Process Mechanical Engineering
TL;DR: In this paper , the microstructure changes in T92 martensitic steel when normalized at 1000 °C for an hour and tempered at 760°C for 2 hours using various cooling techniques, including air cooling, furnace cooling, and water quenching.
Abstract: The T92 martensitic steel is utilized in thermal power plants because of its better mechanical properties, and it is needed to enhance the strength and improve the properties using heat treatment. The research aims to determine how the microstructure changes in T92 martensitic steel when normalized at 1000 °C for an hour and tempered at 760 °C for 2 hours using various cooling techniques, including air cooling, furnace cooling, and water quenching. It is characterized by using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) equipped with energy-dispersive X-ray spectroscopy (EDS), and optical microscopy (OM). Tensile strength, hardness and toughness measurements were also performed on the heat-treated T92 steel specimens. After tensile testing of heat-treated samples of T92 steel, the fracture surface was characterized using SEM to determine the fracture mode. The strength and hardness of T92 material increased with a normalizing of 1000 °C, whereas they decreased with a tempering of 760 °C. Compared to various material conditions, the tempering of 760 °C with air-cooled hold the tensile strength of 887 MPa, hardness of 267.42 HV and toughness of 135 J was shown to be the optimal combination.
References
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"High temperature molten salt corros..." refers background in this paper
...The total weight of the composition selected as 75% of the total weight of the electrode coating composition (equations (3) and (4))....
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...20 CaO 25 35 CaF2 40 05 SiO2 10 01 AI3O3 05 (9)>= >; (3)...
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138 citations
TL;DR: In this article, the first in a series of two reporting on results from an extensive laboratory-scale corrosion study where tailor-made well-characterized synthetic alkali salt deposits were used for corrosion testing of several steel materials used in or aimed for recovery boiler superheater tubing.
137 citations
"High temperature molten salt corros..." refers background in this paper
...chlorides (equation (6)), which have high vapor pressure at metal/scale interface leads to continuous evaporation (equation (7))....
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