HIGH TEMPERATURE TENSILE FRACTURE BEHAVIOR OF ORIENTED DD100 SINGLE CRYSTAL SUPERALLOY
HIGH TEMPERATURE TENSILE FRACTURE BEHAVIOR OF [221]-ORIENTED DD100 SINGLE CRYSTAL SUPERALLOY

An investigation has been made on the tensile fracture behavior of oriented single crystal DD100 superalloy at 850. The appearance of the fracture surface of DD100 reflects the glide plane decohension fracture mechanism, which is different from the fracture of oriented DD100. The tensile strength and elongation are lower than the oriented DD100. Oxygen in air has little effect on the strength of DD100 but reduces the tensile elongation obviously. Oxygen does not affect the fracture mode of DD100 but strongly accelerates the process of fracture.