The Use of Strain Softening to Improve the Properties of Refractory Metals

摘要

The strain softening characteristics of a cold rolled mild steel, the cobalt base alloy V-36 and a number of refractory alloys were investigated. It was found that softening by flexing was able to significantly improve the notch bend ductility and smooth tensile ductility of the steel. The ductility of the cobalt base alloy, on the other hand, was not significantly altered by flexing. Although the smooth bend properties of molybdenum and tungsten were not altered beyond the 'as-received' scatter range, flexing produced a significant improvement in the notch bend ductility especially of the 0.5 Ti-Mo alloy. Test results on cold rolled molybdenum sheet also indicate that a stronger produce with improved formability could be obtained by substituting cold rolling plus flexing for the present process of warm rolling plus stress relieving. (Author)