Effect of Ce on α-Fe Grain Size and Austenite Growth Behavior of 10Cr5MoV Steel
The backscattered electron diffraction(EBSD)process is used to measure and analyze the grain size of α-Fe in two test steels,one containing no rare earth and the other containing Rare Earth Ce.And the results show that the addition of Rare Eearth Ce makes the α-Fe grain refined,and in turn forms the diffused fine rare earth inclusion as the heterogeneous nucleation core,which improves the-nucleation rate in the tempering process;the starting and ending times of the re-crystallization process is delayed by the dragging and pinning effects of the solution rare earth,and thus the driv-ing force of the re-crystallization transformation increased,and in turn the re-crystallization generating temperature is redu-ced.The effect of Rare Earth Ce on austenite growth behavior is studied by means of getting the said two test steels auste-nitized with different austenitization processes.The result demonstrates that under the austenitization conditions of heating at 880～1 180 ℃ and holding for 30～90 minutes,the austenite growth index n and grain growth rate constant K of the test steel decrease,whereas the activation energy Q of austenite growth and the diffusion frequency factor Mo of grain growth increase,which means that the addition of Ce has a certain inhibitory effect on the austenite growth behavior of the test steel.
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