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Environmental effects on irradiation creep behavior of highly purified V–4Cr–4Ti alloys (NIFS-Heats) irradiated by neutrons

2008; Elsevier BV; Volume: 386-388; Linguagem: Inglês

10.1016/j.jnucmat.2008.12.180

1873-4820

K. Fukumoto, Minoru Narui, H. Matsui, Takuya Nagasaka, T. Muroga, M. Li, D. Hoelzer, S.J. Zinkle,

High Temperature Alloys and Creep

In order to investigate the effect of the environment on the irradiation creep properties of highly purified V–4Cr–4Ti alloys, neutron irradiation experiments with sodium-enclosed irradiation capsules in Joyo and lithium-enclosed irradiation capsules in HFIR-17J were carried out using pressurized creep tubes (PCTs). It was found that the creep strain rate exhibited a linear relationship with the effective stress up to 150 MPa at 458 and 598 °C in the Joyo irradiation experiments. For HFIR-17J irradiation at 425 °C, the creep strain rate also exhibited a linear relationship with the effective stress up to 150 MPa. The activation energy of the irradiation creep and irradiation creep stress factor were estimated to be 46 kJ/mol K and 1–2, respectively. No significant difference in the irradiation creep behavior between liquid-sodium and liquid-lithium environments could be seen.