Primary water stress corrosion cracking (PWSCC) is a major materials challenge for dissimilar metal welds (DMW) in pressurized water reactors. The reliability of structure integrity assessment of DMW is strongly dependent on the reliable determination of the weld residual stress (WRS) field, which is one of the primary driving forces for PWSCC. Recent studies have shown that WRS prediction using today’s DMW WRS models strongly depends upon the choice of strain-hardening constitutive model. The commonly used strain hardening models (isotropic, kinematic, and mixed) are all time-independent ones that are inadequate to accounting for the time-dependent (viscous) plastic deformation at the elevated temperatures during welding. Recently, a dynamics strain hardening constitutive model has been proposed and the application of such a model has resulted in improved WRS prediction when compared to the WRS measurement results by contour method and deep-hole drilling method. In this study, the dynamic strain hardening behavior, under uniaxial tensile loading conditions, of several stainless steels and nickel alloys (SS304, Alloy 600, Alloy 82 and Alloy 52) commonly used in pressure vessel nozzle DMW are experimentally determined and compared. The extent of softening due to different duration of high-temperature exposure is studied and its influence on final residual stresses is discussed. An empirical correlation combining both the time and temperature effects on dynamic strain hardening is proposed for weld residual stress modeling.
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ASME 2014 Pressure Vessels and Piping Conference
July 20–24, 2014
Anaheim, California, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-4604-9
PROCEEDINGS PAPER
High Temperature Dynamics Strain Hardening Behavior in Stainless Steels and Nickel Alloys
Xinghua Yu,
Xinghua Yu
Oak Ridge National Laboratory, Oak Ridge, TN
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Dongxiao Qiao,
Dongxiao Qiao
Tsinghua University, Beijing, China
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Zhili Feng,
Zhili Feng
Oak Ridge National Laboratory, Oak Ridge, TN
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Paul Crooker,
Paul Crooker
Electric Power Research Institute, Palo Alto, CA
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Yanli Wang
Yanli Wang
Oak Ridge National Laboratory, Oak Ridge, TN
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Xinghua Yu
Oak Ridge National Laboratory, Oak Ridge, TN
Dongxiao Qiao
Tsinghua University, Beijing, China
Zhili Feng
Oak Ridge National Laboratory, Oak Ridge, TN
Paul Crooker
Electric Power Research Institute, Palo Alto, CA
Yanli Wang
Oak Ridge National Laboratory, Oak Ridge, TN
Paper No:
PVP2014-28869, V06BT06A072; 4 pages
Published Online:
November 18, 2014
Citation
Yu, X, Qiao, D, Feng, Z, Crooker, P, & Wang, Y. "High Temperature Dynamics Strain Hardening Behavior in Stainless Steels and Nickel Alloys." Proceedings of the ASME 2014 Pressure Vessels and Piping Conference. Volume 6B: Materials and Fabrication. Anaheim, California, USA. July 20–24, 2014. V06BT06A072. ASME. https://doi.org/10.1115/PVP2014-28869
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