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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 1 h to 6 h 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).
Grain growth kinetics of austenite in a hypoeutectoid steel (containing carbon of 0.35%) at 920 ° C and in a hypereutectoid steel (containing carbon of 1%) at 980 ° C for holding time ranging from 1 h to 6 h 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).