DEVELOPMENT OF OPTIMUM METHODS FOR THE PRIMARY WORKING OF REFRACTORY METALS

摘要

The objective of this program was to provide for the research and development of new processes and techniques for the primary work¬ing of refractory metal alloys by hot extrusion.nThe process developed during the first years’ work has been considerably improved and has been used successfully in extruding refractory metals at temperatures above 4000°P. This has required the development of improved high temperature billet lubrication, novel die designs utilizing ceramic facing materials, high tempera¬ture heating facilities and methods for accurately sensing billet temperatures. This work has been performed at the Metallurgical Experimental Plant of the Aeronautical Systems Division and the operating level of the equipment located therein has been raised accordingly.nThe suitability of the process has been established by metal¬lurgical evaluation of extruded materials which have demonstrated a high degree of amenability to subsequent reworking by conventional methods.nIn addition, the extrusion process as developed has been applied to a wide variety of refractory metal alloys and has been useful in providing a substantial quantity of wrought materials for other contractors and governmental agencies.