Effects of titanium additions to austenitic ternary alloys on microstructural evolution and void swelling

Abstract

Ternary austenitic model alloys were modified with 0.25 wt.% titanium and irradiated in the Fast Flux Test Reactor (FFTF) at dose rates ranging over more than two orders in magnitude. While lowering of the dose rate strongly increases swelling by shortening the incubation dose, the steady-state swelling rate is not affected by dose rate. Although titanium addition strongly alters the void microstructure, swelling at about 420°C does not change with titanium additions, but the sensitivity to dose rate is preserved.

Acknowledgements

This work was supported by Monbusho, the Japanese Ministry of Education, Science and Culture, under the FFTF-MOTA collaboration and the JUPITER program (Japan–USA Program for Irradiation Testing for Fusion Research), by the US Department of Energy, Office of Fusion Energy under contract DE-AC06-76RLO 1830 with Pacific Northwest National Laboratory, and by a Nuclear Energy Research Initiative (NERI) grant with the Lawrence Livermore National Laboratory under contract No. W-7405-ENG-48 with the DOE. Additional financial support for T. Okita was provided by Nuclear Fuel Industries Ltd. The authors are pleased to acknowledge the contributions of Pacific Northwest National Laboratory employees Ruby Ermi and Elaine Dieffenbacher in specimen retrieval and preparation.

Notes

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N. Sekimura

Disclaimer. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favouring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes.