Abstract
The aging of Fe-0.014%C and Fe-0.45% Mn-0.017%C alloys was studied in the range 60–200°C, after quenching from 730°C. As the aging temperature is decreased, the precipitate in the Fe-C alloy changes from Fe 3C to an unidentified carbide, the carbide habit changes from {110}α to {100}|ga, and nucleation within the matrix is added to nucleation on dislocations. At constant carbon content, manganese lowers the aging temperatures at which these changes occur; silicon raises them. The nucleation and growth of carbide particles during quench-aging is so complex that the development of a simple mathematical expression for the process, applicable over a range of temperatures, seems very unlikely. The large changes in mechanical properties during quench-aging are due to the closely spaced carbides precipitated within the matrix, independent of dislocations.
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