Evaluation of fracture toughness master curve shifts for JMTR irradiated F82H using small specimens

Assessment of irradiation embrittlement of the Eurofer97 steel after 590MeV proton irradiation

“…At higher temperature, constraint loss dominates resulting in very high effective toughness. Such sharp transitions were already observed by Yamamoto et al [8] for specimens of similar size. Second, at temperature low enough all the specimens failed by cleavage below 100 MPa m 1/2 .…”

“…6. In order to calculate the coefficient C 0 , defined as DT 0 /Dr 0.2_RT [8], it was necessary to convert the irradiation hardening at 300°C (50 MPa) to the irradiation hardening at room temperature. A reasonable estimate of the irradiation hardening at T test = 20°C is 62 MPa.…”

Fracture toughness master-curve analysis of the tempered martensitic steel Eurofer97

“…While being attractive candidates, neutron irradiation at temperatures below 400-450°C results in significant shifts of the so-called ductile to brittle transition temperature [2][3][4][5][6][7]. In order to quantify this so-called embrittlement and other factors that control toughness in the transition region, Odette et al proposed a systematic and highly efficient approach based upon the mastercurve temperature shift method [8,9].…”

From materials development to their test in IFMIF: an overview

“…A simple but reasonable approach is to consider a linear relation between T o and σ y . Such an analysis was done for the F82H-mod RAFM steel by Yamamoto et al [43] who found: T o = α σ y with α = 0.58. While some refinements have already been proposed to better take into account the overall effects of irradiation on the plastic flow by calculating an average flow stress increase instead of σ y [44], good predictions of embrittlement can be derived simply from the measure of the radiation hardening.…”