Abstract
The kinetics of ferrite to austenite transformation has been studied in a high strength low alloy steel containing Nb as the carbide forming element. The growth rate and volume fraction measurements were made using optical microscopy. Three distinct stages of the transformation have been observed. The dissolution of pearlite occurs in the first stage. In the second stage, the growth of austenite occurs by the diffusion of carbon into austenite. However, due to paucity of the carbon diffusion field the transformation at this stage can not continue under a full diffusion field but occurs under a truncated diffusion field. In the third stage, austenite grows into ferrite by the diffusion of Mn in ferrite. The parabolic growth rate constants observed experimentally match well with the calculated values.
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