Elevated Temperature Mechanical Properties of a Flux Cored Arc Weldment

摘要

The cell liner concept used in the design of liquid metal fast breeder reactors has the dual function of preventing inert gas leaks between the cells and preventing excessive damage to the concrete, to which the liners are attached, in the event of a hot sodium spill. The design of the liners has to be based on accurate material property data applicable under all conditions (operating and post-fault) of cell liner operation. Normal operating conditions include temperatures up to 65 exp 0 C but the effects of a high-temperature (up to 590 exp 0 C) sodium spill have been estimated to result in temperatures as high as 927 exp 0 C due to possible exothermic reactions. The steel specified for most cell liners is SA 516 (Grade 55) which is a carbon steel of pressure vessel quality. The mechanical property data available on this material and weldments of it are mostly limited to temperatures of 593 exp 0 C and below. A program was initiated to obtain the required short term tensile properties, as a function of strain rate and temperature, and limited creep rupture properties. All the tests were to be performed in air due to the unfeasibility of trying to duplicate the environmental possibilities which can occur during a sodium spill. The tensile and creep property data on the weldment are reported. (ERA citation 06:023524)