Ni-16Cr-17Mo-4W 초합금의 열처리 싸이클에 따른 고온 기계적 특성에 관한 연구

Abstract

One of the main aim of heat-treatment are applied to nickel-base super-alloys is to development the full mechanical property capabilities of casting or age-hardening alloys. It usually consists of a solution-treatment followed by one or more precipitation treatments. In order to ascertain which of the temperature of solution-treatment plays the major role in controlling the mechanical behavior a series of heat treatment cycles experiments have been carried out on three superalloys with different contents of Cr and Mo produced by lost wax process. The optimum mechanical properties of Ni-16Cr-17Mo-4W-base superalloys has been achieved by water quenching from 1180℃ to room temperature. The mechanical properties(tensile strength, yield strength, elongation) at 750℃, 800℃ and 850℃ have been found to be improved by the amount of Mo-carbide (Mo23C6, Mo6C) more than that of Cr-carbide (Cr23C6) by variation of contents of Mo and Cr.