[en] The work-hardening rate versus temperature and the hot-working range of Ni-base alloys were investigated. It was found that the high-speed resistance heated tensile test can be used to develop a work-hardening coefficient that, in conjunction with traditional measurement of reduction-of-area and tensile strength, provides a more complete description of an alloy's hot-working characteristics. Work-hardening coefficients developed for two different compositions, Inconel alloys 600 and 718, agree with the observed behavior of the materials during commercial hot-working operations. The coefficients indicate that alloy 600, a solid-solution alloy, work hardens at temperatures up to 80 percent of its nil ductility temperature. For alloy 718, a complex age-hardenable superalloy, the coefficients indicate significant work hardening at temperatures up to 95 percent of the nil ductility temperature