Influence of annealing temperature on the microstructure and mechanical behaviour of sintered or melted molybdenum

摘要

The present study of pure molybdenum, for applica-tions to terrestrial armament, is part of wider investigations into metals intended for use in situ-ations involving extreme energetic stresses [1,2]. The use of these materials demands forming by working and good ductility properties. We therefore established, depending on the annealing tempera-ture, the mechanical properties and microstructure of two grades of molybdenum. The aim was to define the structural states leading to the greatest ductility of the two materials. The study was pursued by measuring the mechanical characteristics at high temperature in order to define the optimum condi-tions for hot forming. Finally, we propose an explanation of the mechanical behaviour of the materials according to the microstructure and low impurity contents, particularly for carbon and oxy-gen.