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Title: Extrapolation of Fracture Toughness Data for HT9 Irradiated at 360-390°C

Abstract

Following irradiation in the FFTF-AC01 test at 360°C to 5.5 x 1022 n/cm2, two HT9 samples tested at 30°C were measured to have fracture toughness levels of 28.2 and 31.9 MPa m1/2, respectively, whereas a third identical specimen tested at 205°C gave 126 MPa m1/2. Based on testing of notched tensile specimens from the same irradiation test, the low toughness was a result of brittle fracture. A similar low level of toughness has also been demonstrated in HT9 following irradiation at 250°C and therefore such behavior is reproducible. Using ASTM Standard E1921-02, which characterizes the fracture toughness of ferritic steels that experience onset of cleavage cracking at instabilities, it is shown that these data can be analyzed by a Master Curve approach, and that the trend of the fracture toughness over a wider range of temperatures can be estimated. Master Curve analysis demonstrates that toughness will remain low over a wide range of temperatures near 30°C, but will degrade only slightly when temperatures drop to –10°C.

Authors:
;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
984680
Report Number(s):
PNNL-SA-43653
AT6020100; TRN: US201016%%1420
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Effects of Radiation on Materials: 22nd International Symposium on Effects of Radiation on Materials, 1475:99-110
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CLEAVAGE; EXTRAPOLATION; FERRITIC STEELS; FRACTURE PROPERTIES; IRRADIATION; RADIATIONS; TESTING; Fracture toughness, Neutron irradiation, Martensitic steel, Master curve analysis

Citation Formats

Gelles, David S., and Kurtz, Richard J. Extrapolation of Fracture Toughness Data for HT9 Irradiated at 360-390°C. United States: N. p., 2007. Web.
Gelles, David S., & Kurtz, Richard J. Extrapolation of Fracture Toughness Data for HT9 Irradiated at 360-390°C. United States.
Gelles, David S., and Kurtz, Richard J. Tue . "Extrapolation of Fracture Toughness Data for HT9 Irradiated at 360-390°C". United States. doi:.
@article{osti_984680,
title = {Extrapolation of Fracture Toughness Data for HT9 Irradiated at 360-390°C},
author = {Gelles, David S. and Kurtz, Richard J.},
abstractNote = {Following irradiation in the FFTF-AC01 test at 360°C to 5.5 x 1022 n/cm2, two HT9 samples tested at 30°C were measured to have fracture toughness levels of 28.2 and 31.9 MPa m1/2, respectively, whereas a third identical specimen tested at 205°C gave 126 MPa m1/2. Based on testing of notched tensile specimens from the same irradiation test, the low toughness was a result of brittle fracture. A similar low level of toughness has also been demonstrated in HT9 following irradiation at 250°C and therefore such behavior is reproducible. Using ASTM Standard E1921-02, which characterizes the fracture toughness of ferritic steels that experience onset of cleavage cracking at instabilities, it is shown that these data can be analyzed by a Master Curve approach, and that the trend of the fracture toughness over a wider range of temperatures can be estimated. Master Curve analysis demonstrates that toughness will remain low over a wide range of temperatures near 30°C, but will degrade only slightly when temperatures drop to –10°C.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}

Conference:
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