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Title: Microstructural Effects on SCC Initiation PWR Primary Water Cold-Worked Alloy 600

Abstract

SCC initiation behavior of one mill annealed alloy 600 plate heat was investigated in simulated PWR primary water under constant load at yield stress with in-situ direct current potential drop (DCPD) monitoring for crack initiation. Twelve specimens were tested at similar cold work levels among which three showed much shorter SCC initiation times (<400 hrs) than the others (>1200 hrs). Post-test examinations revealed that these three specimens all feature an inhomogeneous microstructure where the primary crack always nucleated along the boundary of large elongated grains protruding normally into the gauge. In contrast, such microstructure was either not observed or did not extend deep enough into the gauge in the other specimens exhibiting ~3-6X longer initiation times. In order to better understand the role of this microstructural inhomogeneity in SCC initiation, high-resolution microscopy was performed to compare carbide morphology and strain distribution between the long grains and normal grains, and their potential effects on SCC initiation are discussed in this paper.

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1440629
Report Number(s):
PNNL-SA-126736
830403000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors (EDM 2017), 1:217-229
Country of Publication:
United States
Language:
English
Subject:
Alloy 600; PWSCC; crack initiation; cold work; banded microstructure; large elongated grain

Citation Formats

Zhai, Ziqing, Toloczko, Mychailo B., and Bruemmer, Stephen M. Microstructural Effects on SCC Initiation PWR Primary Water Cold-Worked Alloy 600. United States: N. p., 2018. Web. doi:10.1007/978-3-319-67244-1_14.
Zhai, Ziqing, Toloczko, Mychailo B., & Bruemmer, Stephen M. Microstructural Effects on SCC Initiation PWR Primary Water Cold-Worked Alloy 600. United States. https://doi.org/10.1007/978-3-319-67244-1_14
Zhai, Ziqing, Toloczko, Mychailo B., and Bruemmer, Stephen M. 2018. "Microstructural Effects on SCC Initiation PWR Primary Water Cold-Worked Alloy 600". United States. https://doi.org/10.1007/978-3-319-67244-1_14.
@article{osti_1440629,
title = {Microstructural Effects on SCC Initiation PWR Primary Water Cold-Worked Alloy 600},
author = {Zhai, Ziqing and Toloczko, Mychailo B. and Bruemmer, Stephen M.},
abstractNote = {SCC initiation behavior of one mill annealed alloy 600 plate heat was investigated in simulated PWR primary water under constant load at yield stress with in-situ direct current potential drop (DCPD) monitoring for crack initiation. Twelve specimens were tested at similar cold work levels among which three showed much shorter SCC initiation times (<400 hrs) than the others (>1200 hrs). Post-test examinations revealed that these three specimens all feature an inhomogeneous microstructure where the primary crack always nucleated along the boundary of large elongated grains protruding normally into the gauge. In contrast, such microstructure was either not observed or did not extend deep enough into the gauge in the other specimens exhibiting ~3-6X longer initiation times. In order to better understand the role of this microstructural inhomogeneity in SCC initiation, high-resolution microscopy was performed to compare carbide morphology and strain distribution between the long grains and normal grains, and their potential effects on SCC initiation are discussed in this paper.},
doi = {10.1007/978-3-319-67244-1_14},
url = {https://www.osti.gov/biblio/1440629}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 02 00:00:00 EST 2018},
month = {Tue Jan 02 00:00:00 EST 2018}
}

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Works referenced in this record:

Stress corrosion crack initiation of alloy 600 in PWR primary water
journal, July 2017