Enhancement of Hot Corrosion Resistance of Modified 9Cr-1Mo Steel Through Surface Nanostructuring and Pre-oxidation

Bandla, Divya Sri; Verma, Preeti; Chattopadhyay, Kausik; Singh, Vakil

doi:10.1007/s11665-018-3751-6

Cited by 6 publications

(2 citation statements)

References 50 publications

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“…Bandla et al. 24 performed ultrasonic shot peening (USSP) to enhance the hot corrosion resistance of P91 steel at 600 °C under the exposure of 100% NaCl coating. The authors observed the higher roughness value and less weight gain for USSP specimen as compared to Un-USSP.…”

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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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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show abstract

“…Additionally, USP process protects the material against penetration of undesirable gases and liquids through removal of porosities (Ref 24). On the other hand, corrosion and oxidation resistance of alloys can also be improved through refinement of grains in surface region by USP (Ref [25][26][27][28][29]. Due to multiple random impacts of shots, severe plastic deformation occurs at the material surface and dislocation density of surface layers increases rapidly.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic Shot Peening on Oxidation Behavior of T91 and SS347 Steels in Air and Steam at 650 °C

Mondal

Chattopadhyay

Singh

2020

J. of Materi Eng and Perform

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Ultrasonic shot peening (USP) is a relatively new process of surface modification to improve mechanical properties as well as corrosion and high-temperature oxidation resistance of metallic materials. The effect of USP on surface properties and the process of high-temperature oxidation in air and steam environment, following USP of the T91 and SS347 steels, was studied in this investigation. Surface modification by USP was done on the T91 and SS347 steels for different time periods of 0.5, 1.0, 1.5, 2.0 and 3.0 min. Microstructural modification, increase in surface roughness and enhancement in microhardness up to a depth of 300-350 lm were observed due to USP. There was also increment in surface roughness as well as microhardness with USP time duration. Thermogravimetric analysis of the oxidation tests showed parabolic oxidation kinetics at 650°C for both the steels. Comparatively more protective oxide scales, containing high amount of Cr, were formed on the USP-treated samples. The thickness of the oxide scale was reduced with increase in the USP time duration. Oxidation resistance of the T91 steel at 650°C, both in air and steam, was improved by the USP treatment. Oxidation resistance of the SS347 steel at 650°C was also improved for the USP2.0 and the USP3.0 conditions.

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Microstructural and Passivation Response of Severely Deformed AISI 304 Steel Surface: The Role of Surface Mechanical Attrition Treatment

Singh

Basha

Singh

et al. 2020

J. of Materi Eng and Perform

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Enhancement of Hot Corrosion Resistance of Modified 9Cr-1Mo Steel Through Surface Nanostructuring and Pre-oxidation

Cited by 6 publications

References 50 publications

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

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

Effect of Ultrasonic Shot Peening on Oxidation Behavior of T91 and SS347 Steels in Air and Steam at 650 °C

Microstructural and Passivation Response of Severely Deformed AISI 304 Steel Surface: The Role of Surface Mechanical Attrition Treatment

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