Research on Evolution Laws of High Temperature Aging Microstructure in Novel Fe-Ni Based Superalloy
The evolution laws of microstructure in a novel Fe-Ni based superalloy utilized in ultra-supercritical thermal power generating units during high temperature aging treatment were investigated through methods such as microstructure observation.The results show that aging at 650℃,there is no obvious precipitate in the grain boundary and in the crystal.With the increase of aging temperature and time,granular TiC and M23C6 carbide precipitates are mainly distributed in chain pattern at grain boundaries.The spherical γ'reinforced phase is mainly distributed in the crystal,and the size increases from a few nanometers to tens of nanometers.Furthermore,some grain boundaries migrated at the aging temperature of 800℃and 850℃,forming precipitation dilution zones and discontinuous coarsening zones.
Fe-Ni based superalloyhigh temperature aging treatmentmicrostructural evolutiongrain boundary migration
万方数据
维普
