Subtask 12G2: Effects of dynamically charged helium on tensile properties of V-4Cr-4Ti
- Argonne National Lab., IL (United States)
The objective of this work is to determine the effect of displacement damage and dynamically charged helium on tensile properties of V-4Cr-4Ti alloy irradiated to 18-31 dpa at 425-600{degrees}C in the Dynamic Helium Charging Experiment (DHCE). One property of vanadium-base alloys that is not well understood in terms of their potential use as fusion reactor structural materials is the effect of simultaneous generation of helium and neutron damage under conditions relevant to fusion reactor operation. In the present Dynamic Helium Charging Experiment (DHCE), helium was produced uniformly in the specimen at linear rates of {approx}0.4 to 4.2 appm helium/dpa by the decay of tritium during irradiation to 18-31 dpa at 425-600{degrees}C in the Li-filled DHCE capsules in the Fast Flux Test Facility. This report presents results of postirradiation tests of tensile properties of V-4Cr-4Ti, an alloy identified as the most promising vanadium-base alloy for fusion reactors on the basis of its superior baseline and irradiation properties. Effects of helium on tensile strength and ductility were insignificant after irradiation and testing at >420{degrees}C. Contrary to initial expectation, room-temperature ductilities of DHCE specimens were higher than those of non-DHCE specimens (in which there was negligible helium generation), whereas strengths were lower, indicating that different types of hardening centers are produced during DHCE and non-DHCE irradiation. In strong contrast to tritium-trick experiments in which dense coalescence of helium bubbles is produced on grain boundaries in the absence of displacement damage, no intergranular fracture was observed in any tensile specimens irradiated in the DHCE. 25 refs., 2 figs., 3 tabs.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- OSTI ID:
- 415190
- Report Number(s):
- ANL/FPP/TM-287; ITER/US-95/IV-MAT-10; ON: DE96000984; TRN: 96:006511-0020
- Resource Relation:
- Other Information: PBD: Mar 1995; Related Information: Is Part Of U.S. Contribution 1994 Summary Report Task T12: Compatibility and irradiation testing of vanadium alloys; Smith, D.L. [comp.]; PB: 198 p.
- Country of Publication:
- United States
- Language:
- English
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