A Study on the Degradation of the Superalloy Inconel 718 Using Ultrasonic Technique

Park, Hong Sun; Kim, Hyung Ick; Huh, Yong; Kim, Moon Young; Park, Sang Yeol; Koo, Jae Mean; Seok, Chang-Sung

doi:10.4028/0-87849-456-1.523

Cited by 1 publication

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“…DIN X20CrMo12.1 steel, which is used in standard coal-fired power plant boiler tubes, contains 12% Cr and additional W or Mo to improve its high-temperature strength, allowing it to be used at temperatures as high as 580 • C. Additionally, it has good resistance to repeated thermal stress, as its thermal expansion coefficient is low and the change in the heat-transfer coefficient as a function of temperature is small. Due to the high amount of Cr, it has excellent corrosion resistance, and the scale formation temperature can reach 700 • C. However, its ductility tends to decrease as the creep rupture time increases according to its properties [24,25]. The chemical composition of the generally used boiler tube is shown in Table 1.…”

Section: Supercritical Tubes In Standard Coal-fired Power Plant Superheaters (Psh)mentioning

confidence: 99%

Analysis of Platen Superheater Tube Degradation in Thermal Power Plants via Destructive/Non-Destructive Characteristic Evaluation

Kim

Han

et al. 2022

Materials

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Coal-fired power plants operating under Korea’s standard supercritical pressure operate in a high-temperature environment, with steam temperatures reaching 540 °C. A standard coal-fired power plant has a 30-year design life, and lifespan diagnosis is performed on facilities that have operated for more than 100,000 h or 20 years. Visual inspection, thickness measurements, and hardness measurements in the field are used to assess the degree of material degradation at the time of diagnosis. In this study, aging degradation was assessed using an electromagnetic acoustic transducer to measure the change in transverse ultrasonic propagation speed, and the results were compared to microstructural analysis and tensile test results. Based on the experimental results, it was found that the boiler tube exposed to a high-temperature environment during long-term boiler operation was degraded and damaged, the ultrasonic wave velocity was reduced, and the microstructural grains were coarsened. It was also confirmed through tensile testing that the tensile and yield strengths increased with degradation. Our findings prove that the degree of change in mechanical properties as a function of the material’s degradation state is proportional to the change in ultrasonic wave velocity.

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Section: Supercritical Tubes In Standard Coal-fired Power Plant Superheaters (Psh)mentioning

confidence: 99%

Analysis of Platen Superheater Tube Degradation in Thermal Power Plants via Destructive/Non-Destructive Characteristic Evaluation

Kim

Han

et al. 2022

Materials

View full text Add to dashboard Cite

show abstract

A Study on the Degradation of the Superalloy Inconel 718 Using Ultrasonic Technique

Cited by 1 publication

References 0 publications

Analysis of Platen Superheater Tube Degradation in Thermal Power Plants via Destructive/Non-Destructive Characteristic Evaluation

Analysis of Platen Superheater Tube Degradation in Thermal Power Plants via Destructive/Non-Destructive Characteristic Evaluation

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