STUDY OF THE FRAGILE-TO-DUCTILE TRANSITION OF TUNGSTEN

The aim of this study consists in analyzing the ductile-brittle transi tion temperature of a sintered tungsten. We lay emphasis on the apprai sal of the influence of the triaxial stress state, of the strain rate and of the applied loading direction on the transition temperature. A simple modeling based on local competition between cleavage stress and theorical elastic yield stress is presented. It allows to appraise th e transition temperature of a material under any loading condition.