Abstract
A specific treatment to produce powder metallurgy (PM) alloy 720 meeting the high temperature creep requirements for turbine discs in the future high temperature reactor is proposed. The resulting microstructure consists of large grains and grain boundaries that are uncorrelated with prior particle boundaries. The tensile and low cycle fatigue properties measured are in the range observed for cast and wrought (C&W) alloy 720 with the same precipitation state. The creep resistance is significantly increased compared with classical PM alloy 720, and approaches that of C&W alloys. This improvement is believed to be due to the reduction of damage sites at the grain boundaries and to a low secondary creep rate. A model has been developed that can reproduce the observed behaviour in relation to metallurgical variables.
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