Development of a TiCp reinforced Ni-based superalloy MMC, with high creep resistance and reduced weightDonnerstag (06.07.2017) 13:40 - 14:00 Uhr Bestandteil von:
Ni-based superalloys possess high creep resistance, but a significant gap of cost and properties remains between their single and polycrystalline forms. To tend this need, it is proposed a TiCp reinforced Inconel X-750 MMC, with a polycrystalline microstructure and potential for weight reduction in turbine blades application. The metallic powder with an addition of 15 vol.%, 1-3 µmd TiC, was prepared through low energy mixing, uniaxial pressing and sintering, followed by a triple heat treatment. Compressive creep tests were performed with constant load, on both original and reinforced alloys, obtaining the steady creep rate, stress exponent and activation energy. The microstructure was analyzed with SEM and XRD techniques. The study shows how the addition of a highly compatible particle reinforcement phase not only reduces the creep rate at high temperature, but also reduces the material weight, thus having potential to promote further reduction in the creep rate by an exponential factor on turbine blades under load.