Browse > Article
http://dx.doi.org/10.1016/j.net.2021.03.004

A practical power law creep modeling of alloy 690 SG tube materials  

Lee, Bong-Sang (Korea Atomic Energy Research Institute)
Kim, Jong-Min (Korea Atomic Energy Research Institute)
Kwon, June-Yeop (Korea Atomic Energy Research Institute)
Choi, Kwon-Jae (Korea Atomic Energy Research Institute)
Kim, Min-Chul (Korea Atomic Energy Research Institute)
Publication Information
Nuclear Engineering and Technology / v.53, no.9, 2021 , pp. 2953-2959 More about this Journal
Abstract
A new practical modeling of the Norton's power law creep is proposed and implemented to analyze the high temperature behaviors of Alloy 690 SG tube material. In the model, both the stress exponent n and the rate constant B are simply treated as the temperature dependent parameters. Based on the two-step optimization procedure, the temperature function of the rate constant B(T) was determined for the data set of each B value after fixing the stress exponent n value by using the prior optimized function at each temperature. This procedure could significantly reduce the numerical errors when using the power law creep equations. Based on the better description of the steady-state creep rates, the experimental rupture times could also be well predicted by using the Monkman-Grant relationship. Furthermore, the difference in tensile strengths at high temperatures could be very well estimated by assuming the imaginary creep stress related to the given strain rate after correcting the temperature effects on the elastic modulus.
Keywords
Power law creep; Parameter optimization; Alloy 690; Steam generator tube;
Citations & Related Records
연도 인용수 순위
  • Reference
1 P.E. MacDonald, V.N. Shah, L.W. Ward, P.G. Elliso, Steam Generator Tube Failures, U. S. NRC, NUREG/CR-6365, INEL-95/0383, 1996.
2 F.H. Norton, The Creep of Steels at High Temperatures, McGraw-Hill, New York, 1929.
3 M.E. Kassner, Fundamentals of Creep in Metals and Alloys, Elsevier, Amsterdam, 2009.
4 A.M. Brown, M.F. Ashby, On the power-law creep equation, Scripta Metall. 14 (1980) 1297-1302.   DOI
5 R.W. Evans, B. Wilshire, Creep of Metals and Alloys, Institute of Metals, London, 1985.
6 W.G. Kim, J.M. Kim, M.C. Kim, Creep deformation and rupture behavior of alloy 690 tube, Trans. KPVP 16 (2020) 49-55. https://doi.org/10.20466/KPVP.2020.16.1.049.   DOI
7 SGTR Severe Accident Working Group, Risk Assessment of Severe Accident-Induced Steam Generator Tube Rupture, U. S. NRC, 1988. NUREG-1570.
8 Y. Liao, K. Vierow, MELCOR analysis of steam generator tube creep rupture in station black out severe accident, Nucl. Technol. 152 (2005) 302-313.   DOI
9 Y. Liao, S. Guentay, Potential steam generator tube rupture in the presence of severe accident thermal challenge and tube flaws due to foreign object wear, Nucl. Eng. Des. 239 (2009) 1128-1135.   DOI
10 K.J. Karwoski, G.L. Maker, M.G. Yoder, U.S. Operating Experience with Thermally Treated Alloy 690 Steam Generator Tubes, U. S. NRC, 2007. NUREG-1841.
11 O.D. Sherby, P.M. Burke, Mechanical behavior of crystalline solids at elevated temperature, Prog. Mater. Sci. 13 (1968) 325-390.
12 F. C Monkman, N.J. Grant, An empirical relationship between rupture life and minimum creep rate in creep-rupture tests, Proc. Am. Soc. Test. Mater. 56 (1956) 593-620.
13 Special Metals Corporation, INCONEL Alloy 690 Specification, SMC-079, 2009, https://www.specialmetals.com/tech-center/alloys.html.
14 S. Sancaktar, M. Salay, R. Lyengar, A. Azarm, S. Majumdar, Consequential SGTR Analysis for Westinghouse and Combustion Engineering Plants with Thermally Treated Alloy 600 and 690 Steam Generator Tubes, U. S. NRC, 2018. NUREG-2195.
15 F.R. Larson, J. Miller, A time-dependence relationship for rupture and creep stresses, Trans. ASME 74 (1952) 765-771.
16 H. Hanninen, M. Ivanchenko, Y. Yagodzinskyy, V. Nevdacha, U. Ehrnsten, P. Aaltonen, Dynamic strain aging of Ni-base alloys INCONEL 600 and 690, in: Proceedings of the 12th International Conference on Environmental Degradation of Materials in Nuclear Power System - Water Reactors, Salt Lake City, USA, August 14-18, 2005.
17 B.S. Lee, S.W. Nam, J.H. Hong, A phenomenological model for transient creep behaviors based on the steady state creep properties, Scripta Mater. 35 (1996) 379-384.   DOI
18 B.S. Lee, H. Stamm, S.W. Nam, A phenomenological model of creep transient at power law region, in: Oikawa, et al. (Eds.), Strength of Materials, The Japan Institute of Metals, 1994, pp. 595-598.
19 B. Derby, M.F. Ashby, Power-laws and A-n correlation in creep, Scripta Metall. 18 (1984) 1079-1084.   DOI
20 A.K. Mukherjee, J.E. Bird, J.E. Dorn, Experimental correlations for high-temperature creep, ASM Trans. Quart. 62 (1969) 155-179.
21 J.M. Kim, M.C. Kim, Derivation of transverse tensile properties of Alloy 690 steam generator tubes under ring-tensile specimen and finite element analysis (PVP2018-84828), in: Proceedings of ASME 2018 Pressure Vessels & Piping Division Conference (PVP 2018), Prague, Czech Republic, July 15-20, 2018.