Progress report on the influence of test temperature and grain boundary chemistry on the fracture behavior of ITER copper alloys
Abstract
This collaborative study was initiated to determine mechanical properties at elevated temperatures of various copper alloys by University of Illinois and Pacific Northwestern National Lab (PNNL) with support of OMG Americas, Inc. and Brush Wellman, Inc. This report includes current experimental results on notch tensile tests and pre-cracked bend bar tests on these materials at room temperature, 200 and 300 C. The elevated temperature tests were performed in vacuum and indicate that a decrease in fracture resistance with increasing temperature, as seen in previous investigations. While the causes for the decreases in fracture resistance are still not clear, the current results indicate that environmental effects are likely less important in the process than formerly assumed.
- Authors:
-
- Univ. of Illinois, Urbana, IL (United States). Dept. of Nuclear Engineering
- Pacific Northwest National Lab., Richland, WA (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Org.:
- USDOE, Washington, DC (United States)
- OSTI Identifier:
- 330626
- Report Number(s):
- DOE/ER-0313/24
ON: DE98007433; TRN: 99:005081
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: PBD: Sep 1998; Related Information: Is Part Of Fusion materials semiannual progress report for the period ending June 30, 1998; Burn, G. [ed.] [comp.]; PB: 314 p.
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION; COPPER BASE ALLOYS; TEMPERATURE DEPENDENCE; GRAIN BOUNDARIES; FRACTURE PROPERTIES; TENSILE PROPERTIES; THERMONUCLEAR REACTOR MATERIALS; EXPERIMENTAL DATA; TEMPERATURE RANGE 0400-1000 K
Citation Formats
Li, M., Stubbins, J.F., and Edwards, D.J.. Progress report on the influence of test temperature and grain boundary chemistry on the fracture behavior of ITER copper alloys. United States: N. p., 1998.
Web. doi:10.2172/330626.
Li, M., Stubbins, J.F., & Edwards, D.J.. Progress report on the influence of test temperature and grain boundary chemistry on the fracture behavior of ITER copper alloys. United States. doi:10.2172/330626.
Li, M., Stubbins, J.F., and Edwards, D.J.. Tue .
"Progress report on the influence of test temperature and grain boundary chemistry on the fracture behavior of ITER copper alloys". United States.
doi:10.2172/330626. https://www.osti.gov/servlets/purl/330626.
@article{osti_330626,
title = {Progress report on the influence of test temperature and grain boundary chemistry on the fracture behavior of ITER copper alloys},
author = {Li, M. and Stubbins, J.F. and Edwards, D.J.},
abstractNote = {This collaborative study was initiated to determine mechanical properties at elevated temperatures of various copper alloys by University of Illinois and Pacific Northwestern National Lab (PNNL) with support of OMG Americas, Inc. and Brush Wellman, Inc. This report includes current experimental results on notch tensile tests and pre-cracked bend bar tests on these materials at room temperature, 200 and 300 C. The elevated temperature tests were performed in vacuum and indicate that a decrease in fracture resistance with increasing temperature, as seen in previous investigations. While the causes for the decreases in fracture resistance are still not clear, the current results indicate that environmental effects are likely less important in the process than formerly assumed.},
doi = {10.2172/330626},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 01 00:00:00 EDT 1998},
month = {Tue Sep 01 00:00:00 EDT 1998}
}
-
In an effort to understand the mechanical behavior at elevated temperatures (>200{degrees}C) of the various copper alloys being considered for use in the ITER first wall, divertor, and limiter, a collaborative study has been initiated by the University of Illinois and PNNL with two industrial producers of copper alloys, Brush Wellman and OMG Americas. Details of the experimental matrix and test plans have been finalized and the appropriate specimens have already been fabricated and delivered to the University of Illinois and PNNL for testing and analysis. The experimental matrix and testing details are described in this report.
-
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One-third scale Charpy impact specimens of V-4Cr-4Ti were given the same heat treatments applied to equivalent specimens of V-5Cr-5Ti. Auger specimens of V-4Cr-4Ti were also heat treated with the Charpy specimens to enable grain boundary chemistry measurements. The microstructural, microchemical and Charpy impact response of V-4Cr-4Ti displayed trends similar to those observed for V-5Cr-5Ti. The results show that grain size plays an important role in determining the ductile-to-brittle transition temperature (DBTT) of these materials and that a threshold level of grain boundary segregant appears to be required to cause grain boundary embrittlement and intergranular fracture.