Evaluation of Commercial Production A533-B Plates and Weld Deposits Tailored for Improved Radiation Embrittlement Resistance,
NAVAL RESEARCH LAB WASHINGTON D C
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A cooperative AECC-ENRL research program is exploring trends in radiation effects for commercially produced ASTM A533-B steel plates, weld deposits, and weld heat affected zones with three controlled levels of impurity copper content. The primary objective is to establish the trend of improved 550 F 288 C radiation performance with progressive reductions in allowable copper content. Overall program objectives are to develop information assisting the formulation of special specifications for steels for nuclear service and the delineation of associated embrittlement trends for vessel design and operation. This report summarizes findings on the radiation resistance of two of three series of A533-B plates and weldments. Series 1 materials contained or 0.15 percent Cu, typical of nonimproved steel production pre-1971. Series 2 materials contained 0.10 percent Cu max., representative of improved steel production current practice. Radiation resistance was assessed from Charpy-V Cv notch ductility changes with irradiation to two fluence levels 2-3 x 10 to the 19th power and 4-5 x 10 to the 19th power nsq cm 1 MeV. Data trends indicate a marked improvement in radiation resistance with the specification of 0.10 percent max. Cu.
- Metallurgy and Metallography
- Fission Reactor Materials