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RESEARCH PAPERS

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

[+] Author and Article Information
P. P. Pizzo

Advanced Research and Applications Corporation, Sunnyvale, Calif. 94035

G. L. Mandurrago

Advanced Reactor Systems Department, General Electric Company, San Jose, Calif.

J. Eng. Mater. Technol 103(1), 62-70 (Jan 01, 1981) (9 pages) doi:10.1115/1.3224973 History: Received February 06, 1980; Online September 15, 2009

Abstract

The short-term age softening characteristics of isothermal annealed and post weld heat treated 2-1/4Cr-1Mo steel have been investigated over the temperature range 454 to 727°C (850 to 1340°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. The reduction in flow strength is greatest, and occurs most rapidly, at 575°C (1067°F). The strength degradation is attributed to time-dependent redistribution of molybdenum within the proeutectoid ferrite. It is predicted that thermal aging in the temperature range 427 to 593°C (800 to 1000°F) will result in similar strength decrements for annealed 2-1/4Cr-1Mo steel regardless of prior thermal history above 704°C (1300°F).

Copyright © 1981 by ASME
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