Age Softening Characteristics of Annealed 2-1/4Cr-1Mo Steel in the Temperature Range 424 to 704°C

The short-term age softening characteristics of isothermal annealed and post weld heat treated at 2-/one quarter/Cr-1Mo steel have been investigated over the temperature range 454 to 727/sup 0/C (850 to 1340/sup 0/F). Significant degradation in flow strength is observed for times and temperatures within the current service regime of the commercial alloy. Age softening is atypical: flow strength degradation is most rapid at some intermediate temperature. 24 refs.