Variation of the Yield Strength and Strain-Rate Sensitivity Exponent of Type 21-6-9 Stainless Steel over a Wide Temperature Range

摘要

The yield strength of solution-annealed 21-6-9 austenitic stainless steel was determined over a wider temperature range (-195 to 1100 exp 0 C) than has been previously reported. The most noteworthy characteristic of the variation of yield stress with temperature was the dramatic decrease in yield strength from -195 exp 0 C to 300 exp 0 C. The strain-rate sensitivity exponent, N, was determined using strain-rate change tests. A plot of N vs temperature showed that n dramatically increased at about 850 exp 0 C and that N is approximately independent of strain (structure). 3 figures. (ERA citation 08:010253)