Microstructural characterization of structural components for Gen-IV Nuclear systems
Materials Science and Engineering
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Inconel 617, PM 2000 and MA 956 are alloys recommended for out-of-core structural materials for SFR and VTHR systems. The high temperature deformation for the alloys has been investigated for strain rates varying form 10-3 to 10-5 s-1 at 800°C and 1000°C.The microstructure of the inconel 617 showed increase in grain size and secondary phase precipitates with increase in temperature and decrease in strain rate. The AFM/SKPFM technique measured a surface potential of 389.79mv for the 10-3 strain rate compared to 103.11mv for the 10-5 strain rate hence implying that damage accumulation can be monitored using this non-invasive technique. The creep deformation was investigated for PM 2000 and the secondary creep rate was found to be 1.3 X 10-8 s-1. The morphology of the ODS particles varied as well as the composition. However, pinning of the dislocations and particle fracture was observed. The friction Stir welding of the MA 956 was successful but contamination of the weld by the tool resulted in an increase in hardness from 240 kg/mm2 to 375 kg/mm2.