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Research Papers: Materials and Fabrication

Deterministic Formulation of the Effect of Stress Intensity Factor on PWSCC of Ni-Base Alloys and Weld Metals

[+] Author and Article Information
Tetsuo Shoji

e-mail: tshoji@rift.mech.tohoku.ac.jp

Chaoyang Fu

Fracture and Reliability Research Institute,
Faculty of Engineering,
Tohoku University,
Aramaki Aoba 6-6-10, Aoba-ku,
Sendai 980-8579, Japan

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received July 4, 2011; final manuscript received June 9, 2012; published online March 18, 2013. Assoc. Editor: Xian-Kui Zhu.

J. Pressure Vessel Technol 135(2), 021402 (Mar 18, 2013) (9 pages) Paper No: PVT-11-1149; doi: 10.1115/1.4007471 History: Received July 04, 2011; Revised June 09, 2012

The fundamental correlations such as crack growth rate (CGR) versus K for primary water stress corrosion cracking (PWSCC) of nickel-base alloys in simulated pressurized water reactor environments are quantified with the theoretical model based on the combination of crack tip mechanics and oxidation kinetics. Materials reliability program (MRP) proposed a CGR disposition curve in a report MRP 55 for PWSCC of thick-section Alloy 600 materials. This deterministic CGR equation has been adopted by Section XI Nonmandatory Appendix O of the ASME Boiler and Pressure Code for flaw evaluation. MRP also proposed a CGR disposition curve in a report MRP 115 for PWSCC of Alloy 82/182/132 weld metals. Stress intensity factor (K), temperature and thermal activation energy are included in both MRP 55 and MRP 115 reports. Both MRP 55 and MRP 115 are engineering-based. The results of mechanism-based modeling are compared with the screened experimental data for typical PWSCC systems of nickel-base alloys and the consistence is observed.

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References

Figures

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Fig. 4

SCC growth rate data by Cassagne et al. [16] for Alloy 600 in simulated PWR primary water at 310 and 330 °C and fitting parameters

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Fig. 3

SCC growth rate data by Moshier and Brown [15] for cold worked Alloy 600 in simulated PWR primary water and fitting parameters

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Fig. 2

SCC growth rate data by reported by Foster et al. [14] for Alloy 600 in simulated PWR primary water 320 °C and fitting parameters

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Fig. 12

(a) Experimental data [17], and calculated PWSCC growth rates of Alloy 182 with the theoretical model based on quasi-solid state oxidation kinetics, and (b) k1 and r0 optimized at different film degradation strain levels

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Fig. 1

Plots of various CGR-K curves defined by various equations for PWSCC of Ni-base alloys and weld metals at 325 °C

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Fig. 13

(a) Field and experiment data [7,20,20] and calculated PWSCC growth rates of Alloy 182 with the theoretical model based on quasi-solid state oxidation kinetics, and (b) optimized values of k1 and r0

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Fig. 5

SCC growth rate data by Norring et al. [17] for Alloy 182 in simulated PWR primary water 320 °C and fitting parameters

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Fig. 6

SCC growth rate data reported by Paraventi and Moshier [18] for Alloy 182 in simulated PWR primary water and related fitting parameters

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Fig. 7

SCC growth rate data reported by Paraventi and Moshier [18] for cold worked Alloy 82 in simulated PWR primary water and fitting parameters

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Fig. 8

EDF PWSCC of Alloy 600 VHP field data by Amzallag and Vaillant [19] and fitting parameters. The temperature of cold dome is about 287 ± 4 °C, and the mean temperature of the hot dome is about 313.5 °C.

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Fig. 9

PWSCC plant data of Alloy 182 in Ringhal 3 hot leg safe end nozzle weld [7] and some experimental data [20]

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Fig. 10

Values of nkt calculated with Eq. (22) for various combinations of m and nRO

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Fig. 11

(a) Experimental data [14], and calculated PWSCC growth rates of Alloy 600 with the theoretical model based on quasi-solid state oxidation kinetics, and (b) k1 and r0 optimized at different film degradation strain levels

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