抄録
The effect of prestraining on the room-temperature ductility of pure chromium containing 0.004% nitrogen was studied. The ductility of chromium was very poor in the recrystallized condition, however, specimens which were prestrained from 0.75 to 3% at 400°C and 3 to 8% at 500°C by rolling became ductile and some of them showed an elongation of more than 40% in the tensile test. Furthermore, needle-like precipitates, presumably nitrides, were observed by an electron microscope on the specimens which were ductile after being properly prestrained.
The author’s explanation offered for this effect is that the prestraining under specific conditions causes a decrease of dissolved nitrogen atoms by increasing the precipitation of nitrides.
