Abstract
The high-chromium high-nickel alloy is widely used as a heat-resistant material for components in plants under elevated temperatures, and thus, prediction of its creep deformation and rupture life is required for safe design. In this study, a creep constitutive model for the 28-48WCo alloy was determined by employing the Sherby-Dorn equation. Creep deformation tests were conducted at temperatures of 817, 871, 927 and 982 °C, under an applied stress ranging from 27.58 to 82.74 MPa. High temperature tension tests were also conducted to measure the change in elastic modulus with temperature variation. The model provided good predictability of the minimum creep strain rate in the range of experimental test conditions, with a coefficient of determination of 0.92. The creep rupture life was characterized using the Larson-Miller parameter. Creep design curves were proposed to estimate the creep rupture life of the 28-48WCo alloy at a temperature range of 817–982 °C.
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Van Hung Dao received his M.S. degree in Mechanical Engineering from Chung-Ang University, Korea in 2016. He is currently a Ph.D. student at Chung-Ang University. His research interests are microstructural analysis and application of high temperature fracture mechanics to life assessment of structural material such as reformer tube.
Kee Bong Yoon received his M.S. in Mechanical Engineering from KAIST and Ph.D. from Georgia Institute of Technology. He is currently a Professor at Chung-Ang University. His research interests are high temperature fracture mechanics, failure analysis and risk based management of facilities in semiconductor industry as well as the conventional power and process plants.
Gimo Yang received his Ph.D. degree in Mechanical Engineering from Chung-Ang University, Korea in 2014. Dr. Yang is currently a Director of engineering at MetalLAB, Inc. His research interest is engineering failure analysis and diagnosis of plant and process facilities.
Jae Sung Oh received his M.S. in Industrial System Engineering from Chungnam National University. He is currently a Ph.D. candidate in Chung- Ang University. And he is also President in MetalLAB Inc. His research interests are mechanical behavior of dissimilar weldments in power and process plant.
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Dao, V.H., Yoon, K.B., Yang, G. et al. Determination of creep constitutive model for 28-48WCo alloy based on experimental creep tests at 817–982 °C. J Mech Sci Technol 32, 4201–4208 (2018). https://doi.org/10.1007/s12206-018-0818-0
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DOI: https://doi.org/10.1007/s12206-018-0818-0