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Asymptotic creep deformation behavior of modified HP steel after long-term service

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Abstract

Creep behavior of modified HP steel was investigated through the tensile creep tests under the stress conditions of 25–55 MPa at 950 °C with four reformer tubes of different service periods: Unused (virgin), 8.50, 9.67, and 16.17 year aged. The minimum creep strain rates, creep rupture life, as well as elongation and reduction of area of the ruptured specimen were measured. It was observed that all the measured properties did not vary with different service periods. The creep deformation behavior was modeled based on the experimentally measured creep data utilizing the secondary creep (SC) model, the tertiary creep (TC) model, and the combined model of two latter ones (SC-TC model). The results indicated the asymptotic creep deformation behavior of the secondary creep strain rate. The tertiary creep also demonstrated asymptotic behavior, however, its strain rate slightly increased, as the service period increased. The creep curves predicted by the SC-TC model were more accurate than those obtained using the SC or TC model. Microstructural observations supported the observed asymptotic behavior.

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Abbreviations

A :

Creep coefficient of secondary creep stages

A3 :

Creep coefficient of tertiary creep stages

n :

Creep exponent of secondary creep stages

n 3 :

Creep exponent of tertiary creep stages

p 3 :

Creep constant of tertiary creep stages

σ :

Applied stress

ε :

Total creep strain

ε TC :

Creep strain of tertiary creep stages

̇ε :

Creep strain rate

̇ε SC :

Secondary creep strain rate

̇ε TC :

Tertiary creep strain rate

P :

Larson-Miller parameter

T:

Temperature

tr :

Creep rupture time

tt :

Tertiary creep initiation time

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Acknowledgments

This research was supported by the Chung-Ang University Graduate Research Scholarship (Mr. Jong Min Yu) in 2016. This work was also supported by the KETEP (No. 2013 2010 500060) granted financial resource from the Ministry of Trade, Industry & Energy (MOTIE).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Korea

    Jong Min Yu, Van Hung Dao, Vanno Lok, Thi Giang Le & Kee Bong Yoon

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Corresponding author

Correspondence to Kee Bong Yoon.

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Recommended by Editor Chongdu Cho

Jong Min Yu received his M.S. in Mechanical Engineering from Chung-Ang University. He is currently a Ph.D. candidate in Chung-Ang University. His research interest is life and integrity assessment of facilities in power and process plants. He is also interested in creep fracture of additive manufactured components.

Van Hung Dao received his M.S. and Ph.D. degrees in Mechanical Engineering from Chung-Ang University. He is currently a postdoctoral fellow at Chung-Ang University. His research interests are microstructural analysis and application of high temperature fracture mechanics to life assessment of structural material. He is extending research to behavior of additive manufactured materials.

Vanno Lok received his B.S. in Industrial and Mechanical Engineering from Institute of Technology of Cambodia. He received M.S. in Mechanical Engineering from Chung-Ang University. He is currently a Ph.D. candidate in Chung-Ang University. His research interests are stress analysis problem in pressure vessel & piping application in power plant and microstructural analysis of high temperature fracture mechanics to structural materials in life assessment.

Thi Giang Le received her B.S. in Metallurgical Engineering from Hanoi University of Science and Technology. She received M.S. and Ph.D. in mechanical engineering from Chung-Ang University. Her research interest is creep behavior and aging characteristics of the high temperature alloy materials.

Kee Bong Yoon received his B.S. in Mechanical Engineering from Seoul National University, M.S. 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 and risk based management of energy plants and semiconductor plants. He is extending research to fracture of additive manufactured materials.

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Yu, J.M., Dao, V.H., Lok, V. et al. Asymptotic creep deformation behavior of modified HP steel after long-term service. J Mech Sci Technol 34, 1997–2009 (2020). https://doi.org/10.1007/s12206-020-0421-z

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  • DOI: https://doi.org/10.1007/s12206-020-0421-z

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