The mechanical properties and strengthening mechanism of Nb-based super-alloys

AbstractIn the present paper, the mechanical properties and strengthening mechanism of Nb-based alloy were studied. The scanning electronic microscope, transmission electron microscope, Olympus optical microscope and vacuum high-temperature tensile engine were used to characterize the alloy. The Nb-based super alloy can be strengthening by two approaches. One is solid solution strengthening,i.e.W and Mo in the Nb based alloy act as alloy elements to form solid solution, improving high temperature creep properties.The other one was aging strengthening,i.e.C and Zr were added to form carbide particles during the aging. The effect of C and Zr content and heat treatment on aging strengthening was also investigated