Creep deformation and fracture of dz40m directionally solidified cobalt-base superalloy at high temperature

摘要

The creep deformation and fracture of DZ40M directionally solidified cobalt - based superalloy have been investigated at 900 deg. C under stress in the range of 105 ～ 125 Mpa. The microstructures, fractures and substructures of crept specimens have been examined by SEM and TEM. The microstructures, fractures alloy exhibits a high creep ductility and its stress dependence of steady state creep rate is of a typical feature of precipitation hardened alloys, its creep behaviour is closely related to microstructural change.