Search

Abstract: The paper presents irradiation creep data for V–4Cr–4Ti irradiated to 3.7dpa at 425 and 600°C in the HFIR-17J experiment. Creep deformation was characterized by measuring diametral changes of pressurized creep tubes before and after irradiation. It was found that the creep strain rate of the US Heat 832665 of V–4Cr–4Ti exhibited a linear relationship with stress up to ∼180MPa at 425°C with a creep coefficient of 2.50×10−6 MPa−1 dpa−1. A linear relationship between creep rate and applied stress was observed below ∼110MPa at 600°C with a creep coefficient of 5.41×10−6 MPa−1 dpa−1; non-linear creep behavior was observed above ∼110MPa, and it may not be fully accounted by invoking thermal creep. The bilinear creep behavior observed in the same alloy irradiated in BR-10 was not observed in this study. [Copyright &y& Elsevier]

Considerable progress has been made toward development of vanadium alloys for fusion. Much of the recent research has focused on vanadium alloys containing 4–5% Cr and 4–5% Ti, but a number of alternative compositions and processing routes have been explored in an effort to achieve improved performance. The goal of this paper is to review significant new results and to highlight critical issues that remain for future research. Progress in understanding the influence of interstitial impurities on microstructural evolution in both thermal and radiation environments are covered. The current state of knowledge of hardening and embrittlement of vanadium alloys in response to neutron irradiation is reviewed. Atomic-scale computer simulations to elucidate fundamental irradiation damage mechanisms are presented. The thermal and irradiation creep behavior of V–4Cr–4Ti is summarized along with an overview of the effects of He on tensile properties. [Copyright &y& Elsevier]