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Application of small punch technique to innovative materials for large power plants

pubblicazioni - Memoria

Application of small punch technique to innovative materials for large power plants

The paper summarises recent experience performed at RSE related to the application of small punch technique to some advanced materials for large power plants. The activity includes two main items: a) creep characterisation by small punch of nichel alloys used for manufacturing of high temperature components in gas turbines, b) mechanical characterisation at low and high temperatures of innovative ODS (oxide dispersion strenghtened) steels under development for future application in Generation IV nuclear power plant.

The paper summarises recent experience performed at RSE in the frame of the RdS (research for italian electro-energy system) related to the application of small punch technique to some advanced materials for large power plants. The activity includes two main items: a) creep characterisation by small punch of nichel alloys used for manufacturing of high temperature components in gas turbines, b) mechanical characterisation at low and high temperatures of innovative ODS (oxide dispersion strenghtened) steels under development for future application in Generation IV nuclear power plant. Nichel alloy blades of modern gas turbine requires a continuosly improved reliability of mechanical properties for ex-serviced materials estimated with small size techniques due to limitation of material volume available from serviced component, especially in the areas of blades exposed to highest stress and temperature sollicitations. Tests of small punch creep have been performed on a nichel alloy, not yet tested with small punch, including some tests performed at temperature higher than 1000°C. ODS steels are candidate materials for application in some nuclear fast reactors of Generation IV. The limited quantity available for these innovative materials, not yet considered as widespread commercial products, creates an increased interest in the application of small size technique. Some ODS steels have been characterised with test at low temperature (tensile and ductile-brittle transition properties) and high temperature (creep properties) with interesting results related to the detection of material anisotropy by means of small punch technique. Some indications appear also for a new approach in the correlation of conventional mechanical test properties with small punch results.

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