TY - JOUR
T1 - Embrittlement of reduced-activation ferritic/martensitic steels irradiated in HFIR at 300 °C and 400 °C
AU - Klueh, R. L.
AU - Sokolov, M. A.
AU - Shiba, K.
AU - Miwa, Y.
AU - Robertson, J. P.
PY - 2000/12
Y1 - 2000/12
N2 - Miniature tensile and Charpy specimens of four ferritic/martensitic steels were irradiated at 300 °C and 400 °C in the high flux isotope reactor (HFIR) to a maximum dose of ≈12 dpa. The steels were standard F82H (F82H-Std), a modified F82H (F82H-Mod), ORNL 9Cr-2WVTa, and 9Cr-2WVTa-2Ni, the 9Cr-2WVTa containing 2% Ni to produce helium by (n,α) reactions with thermal neutrons. More helium was produced in the F82H-Std than the F82H-Mod because of the presence of boron. Irradiation embrittlement in the form of an increase in the ductile-brittle transition temperature (ΔDBTT) and a decrease in the upper-shelf energy (USE) occurred for all the steels. The two F82H steels had similar ΔDBTTs after irradiation at 300 °C, but after irradiation at 400 °C, the ΔDBTT for F82H-Std was less than for F82H-Mod. Under these irradiation conditions, little effect of the extra helium in the F82H-Std could be discerned. Less embrittlement was observed for 9Cr-2WVTa steel irradiated at 400 °C than for the two F82H steels. The 9Cr-2WVTa-2Ni steel with ≈115 appm He had a larger ΔDBTT than the 9Cr-2WVTa with ≈5 appm He, indicating a possible helium effect.
AB - Miniature tensile and Charpy specimens of four ferritic/martensitic steels were irradiated at 300 °C and 400 °C in the high flux isotope reactor (HFIR) to a maximum dose of ≈12 dpa. The steels were standard F82H (F82H-Std), a modified F82H (F82H-Mod), ORNL 9Cr-2WVTa, and 9Cr-2WVTa-2Ni, the 9Cr-2WVTa containing 2% Ni to produce helium by (n,α) reactions with thermal neutrons. More helium was produced in the F82H-Std than the F82H-Mod because of the presence of boron. Irradiation embrittlement in the form of an increase in the ductile-brittle transition temperature (ΔDBTT) and a decrease in the upper-shelf energy (USE) occurred for all the steels. The two F82H steels had similar ΔDBTTs after irradiation at 300 °C, but after irradiation at 400 °C, the ΔDBTT for F82H-Std was less than for F82H-Mod. Under these irradiation conditions, little effect of the extra helium in the F82H-Std could be discerned. Less embrittlement was observed for 9Cr-2WVTa steel irradiated at 400 °C than for the two F82H steels. The 9Cr-2WVTa-2Ni steel with ≈115 appm He had a larger ΔDBTT than the 9Cr-2WVTa with ≈5 appm He, indicating a possible helium effect.
UR - http://www.scopus.com/inward/record.url?scp=0034539255&partnerID=8YFLogxK
U2 - 10.1016/S0022-3115(00)00086-6
DO - 10.1016/S0022-3115(00)00086-6
M3 - Article
AN - SCOPUS:0034539255
SN - 0022-3115
VL - 283-287
SP - 478
EP - 482
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - PART I
ER -