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Title: Effects of impurities on environmentally assisted crack growth of solution-annealed austenitic steels in primary water at 325 C

Abstract

Effects of impurities (Si, P, and S) in steel on environmentally assisted cracking (EAC) behavior of solution-annealed austenitic steels in pressurized water reactor (PWR) primary water at 325 C were investigated. The basic chemical composition of the steels was 12% Cr-28% Ni, simulating the grain boundary (GB) composition of irradiated Type 304 (UNS S30400) stainless steel. The EAC crack growth behavior of the steels was examined by performing trapezoidal wave cyclic loading testing on precracked specimens. Results showed that Si significantly affected the EAC by promoting intergranular cracking, with only 0.48% Si promoting almost fully intergranular cracking under trapezoidal wave loading: increasing the crack growth rate; and tending to make cracking easier in the near-surface region rather than in the center of specimens. Only transgranular cracking with relatively low crack growth rates took place in the steel without Si but doped with S and P, respectively. The stress corrosion cracking (SCC) velocities of the steels during trapezoidal wave cyclic loading were estimated. It also was found that the oxide films formed on Si-doped steels in the water were easier to detach than those on Si-free steels during ultrasonic vibration. Three possible mechanisms were proposed to explain the Si effect onmore » EAC behavior. The present results suggest that a radiation-induced low Cr/high (Ni, Si) GB layer in Type 304 steel can be intrinsically susceptible to intergranular SCC in PWR primary water.« less

Authors:
; ;
Publication Date:
Research Org.:
Tohoku Univ., Sendai (JP)
OSTI Identifier:
20075964
Resource Type:
Journal Article
Journal Name:
Corrosion (Houston)
Additional Journal Information:
Journal Volume: 56; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0010-9312
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; STRESS CORROSION; FRACTURE PROPERTIES; AUSTENITIC STEELS; PWR TYPE REACTORS; IMPURITIES; SILICON; PHOSPHORUS; SULFUR; CRACK PROPAGATION; TEMPERATURE RANGE 0400-1000 K

Citation Formats

Li, G.F., Kaneshima, Y., and Shoji, T. Effects of impurities on environmentally assisted crack growth of solution-annealed austenitic steels in primary water at 325 C. United States: N. p., 2000. Web. doi:10.5006/1.3280550.
Li, G.F., Kaneshima, Y., & Shoji, T. Effects of impurities on environmentally assisted crack growth of solution-annealed austenitic steels in primary water at 325 C. United States. doi:10.5006/1.3280550.
Li, G.F., Kaneshima, Y., and Shoji, T. Mon . "Effects of impurities on environmentally assisted crack growth of solution-annealed austenitic steels in primary water at 325 C". United States. doi:10.5006/1.3280550.
@article{osti_20075964,
title = {Effects of impurities on environmentally assisted crack growth of solution-annealed austenitic steels in primary water at 325 C},
author = {Li, G.F. and Kaneshima, Y. and Shoji, T.},
abstractNote = {Effects of impurities (Si, P, and S) in steel on environmentally assisted cracking (EAC) behavior of solution-annealed austenitic steels in pressurized water reactor (PWR) primary water at 325 C were investigated. The basic chemical composition of the steels was 12% Cr-28% Ni, simulating the grain boundary (GB) composition of irradiated Type 304 (UNS S30400) stainless steel. The EAC crack growth behavior of the steels was examined by performing trapezoidal wave cyclic loading testing on precracked specimens. Results showed that Si significantly affected the EAC by promoting intergranular cracking, with only 0.48% Si promoting almost fully intergranular cracking under trapezoidal wave loading: increasing the crack growth rate; and tending to make cracking easier in the near-surface region rather than in the center of specimens. Only transgranular cracking with relatively low crack growth rates took place in the steel without Si but doped with S and P, respectively. The stress corrosion cracking (SCC) velocities of the steels during trapezoidal wave cyclic loading were estimated. It also was found that the oxide films formed on Si-doped steels in the water were easier to detach than those on Si-free steels during ultrasonic vibration. Three possible mechanisms were proposed to explain the Si effect on EAC behavior. The present results suggest that a radiation-induced low Cr/high (Ni, Si) GB layer in Type 304 steel can be intrinsically susceptible to intergranular SCC in PWR primary water.},
doi = {10.5006/1.3280550},
journal = {Corrosion (Houston)},
issn = {0010-9312},
number = 5,
volume = 56,
place = {United States},
year = {2000},
month = {5}
}