Grain growth kinetics of austenite in a hypoeutectoid steel (containing carbon of 0.35%) at 920℃ and in a hypereutectoid steel (containing carbon of 1%) at 980℃ for holding time ranging from 1h to 6h was investigated.The hypoeutectoid steel exhibited normal grain growth .without solute drag hindrance with a time exponent (0.51)close to the theoretical value (0.5).However,the grain growth of austenite in the hypereutectoid steel held up to 3 h was extremely slow,characterizing by a low value of time exponent (0.08).Thereafter,a breakaway occurred and the grain growth in the hypereutectoid steel held from 3 h to 6 h progressed normally with a time exponent (0.52)close to the theoretical value (0.5).
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