High Strain Rate Tensile Properties Of Annealed 2 1 4 Cr 1 Mo Steel

The high strain rate tensile properties of annealed 2$sup 1$/$sub 4$ Cr- 1 Mo steel were determined and the tensile behavior from 25 to 566$sup 0$C and strain rates of 2.67 x 10$sup -6$ to 144/s were described. Above 0.1/s at 25$sup 0$C, both the yield stress and the ultimate tensile strength increased rapidly with increasing strain rate. As the temperature was increased, a dynamic strain aging peak appeared in the ultimate tensile strength-temperature curves. The peak height was a maximum at about 350$sup 0$C and 2.67 x 10$sup -6$/s. With increasing strain rate, a peak of decreased height occurred at progressively higher temperatures. The major effect of strain rate on ductility occurred at elevated temperatures, where a decrease in strain rate caused an increase in total elongation and reduction in area. (auth).