High temperature molten salt corrosion investigations on P22/P91 power plant dissimilar welds

Mahajan, Sumit; Chhibber, Rahul

doi:10.1177/0954408920966304

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…Various researchers suggested the employment of corrosion-resistance metallic coatings to protect the components at elevated temperature. [5][6][7] Coatings are developed on the steels and superalloy materials to impart corrosion and oxidation resistance at elevated temperatures. 8 Several techniques were employed to prepare metallic coatings, such as chemical vapour deposition (CVD), sputtering, diffusion, electroplating, and thermal spraying systems.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and hot corrosion characteristics evaluation of high-velocity oxy-fuel sprayed Ni–20%Cr coating on AISI 321 steel with Na₂SO₄–60%V₂O₅ salt deposits

Arivarasu¹,

MOGANRAJ

Sanford

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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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.

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Section: Introductionmentioning

confidence: 99%

“…Various researchers suggested the employment of corrosion-resistance metallic coatings to protect the components at elevated temperature. 5–7…”

Section: Introductionmentioning

confidence: 99%

Microstructure and hot corrosion characteristics evaluation of high-velocity oxy-fuel sprayed Ni–20%Cr coating on AISI 321 steel with Na₂SO₄–60%V₂O₅ salt deposits

Arivarasu¹,

MOGANRAJ

Sanford

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…The prevention to failure of the power plant components before its predefined life due to accelerated hot corrosion in the materials is an essential need of the present time. 8,9 Based on the high-temperature applications, hot corrosion can be defined as Type Ι (above the melting point of Na 2 SO 4 ) and Type ΙΙ (takes place below 750 °C) hot corrosion. 10…”

Section: Introductionmentioning

confidence: 99%

Mechanical, microstructure, and hot corrosion investigations on P22/P91 dissimilar tungsten inert gas weld

Khan

Mahajan

Khan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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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 conditions. This study investigates the weld joint between P22/P91 steel using tungsten inert gas process employing a P22 matching filler metal. The fabricated weld has been characterized for mechanical properties of tensile strength and microhardness. The microstructural examination has been carried out in the weld region, transition zones, and base metals. The weld was exposed to a temperature of 700 °C in the environment of molten salt (50% Na2SO4 + 50% NaCl) to quantify the effect of high-temperature corrosion at its sight of application. Furthermore, the welds were also shot-peened and its effect on corrosion properties has been examined. The corroded specimens were examined using X-ray diffraction and scanning electron microscope to analyze the oxide scale produced upon exposure to high temperature in a controlled environment. The P22 base metal was found to oxidize more severely as compared to the weld fusion zone. Shot peening improves the corrosion resistance of weld by 7.56%. The results of this study comprehensively cover multiple aspects of weld integrity as per the service conditions, with its results having significant application in the power plant industry.

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Research Gap Finding in Shielded Metal Arc Welding of Steel

Ary,

Muhayat,

Triyono

2023

E3S Web of Conf.

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Shielded Metal Arc Welding (SMAW) is a commonly employed method for joining steel in general industrial applications, encompassing both similar metals (SMW) and dissimilar metals (DMW) welding, primarily due to economic considerations. However, the welding process itself can lead to a reduction in joint strength. In order to identify the parameters and testing methods that can be developed, it is possible to gather and statistically analyze previous research studies. Through the data analysis of parameter types and testing in both SM and DM welding, significant research gaps can be identified, paving the way for further research and exploration in this field. This has consequently spurred the advancement of welding research, which focuses on exploring various parameters and conducting tests to achieve high-quality welds.

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High temperature molten salt corrosion investigations on P22/P91 power plant dissimilar welds

Cited by 6 publications

References 25 publications

Microstructure and hot corrosion characteristics evaluation of high-velocity oxy-fuel sprayed Ni–20%Cr coating on AISI 321 steel with Na₂SO₄–60%V₂O₅ salt deposits

Microstructure and hot corrosion characteristics evaluation of high-velocity oxy-fuel sprayed Ni–20%Cr coating on AISI 321 steel with Na₂SO₄–60%V₂O₅ salt deposits

Mechanical, microstructure, and hot corrosion investigations on P22/P91 dissimilar tungsten inert gas weld

Research Gap Finding in Shielded Metal Arc Welding of Steel

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High temperature molten salt corrosion investigations on P22/P91 power plant dissimilar welds

Cited by 6 publications

References 25 publications

Microstructure and hot corrosion characteristics evaluation of high-velocity oxy-fuel sprayed Ni–20%Cr coating on AISI 321 steel with Na2SO4–60%V2O5 salt deposits

Microstructure and hot corrosion characteristics evaluation of high-velocity oxy-fuel sprayed Ni–20%Cr coating on AISI 321 steel with Na2SO4–60%V2O5 salt deposits

Mechanical, microstructure, and hot corrosion investigations on P22/P91 dissimilar tungsten inert gas weld

Research Gap Finding in Shielded Metal Arc Welding of Steel

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Microstructure and hot corrosion characteristics evaluation of high-velocity oxy-fuel sprayed Ni–20%Cr coating on AISI 321 steel with Na₂SO₄–60%V₂O₅ salt deposits

Microstructure and hot corrosion characteristics evaluation of high-velocity oxy-fuel sprayed Ni–20%Cr coating on AISI 321 steel with Na₂SO₄–60%V₂O₅ salt deposits