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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Rare Earth Elements on Isothermal Transformation Kinetics in Si-Mn-Mo Bainite Steels
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Effect of Rare Earth Elements on Isothermal Transformation Kinetics in Si-Mn-Mo Bainite Steels

机译：稀土元素对Si-Mn-Mo贝氏体钢等温转变动力学的影响

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摘要

Isothermal heat treatments to Si-Mn-Mo steel specimens were performed, and time-temperature-transformation curves (C-curves) were plotted by DIL805A/D differential dilatometer. The effect of rare earth (RE) elements on bainite transformation kinetics was systematically studied by adopting the empirical electron theory of solids and molecules, Johnson-Mehl-Avrami equation calculation, dilatometry, and metallography. Experimental results show that the addition of RE in Si-Mn-Mo bainite steels leads to the C-curves moving to bottom right and prolongs incubation period of bainite transformation. Moreover, RE addition increases the values of phase structure factors (n (A), F (C) (D) ) and activation energy of bainite transformation, inhibits the formation of granular bainite, and refines microstructures of bainitic ferrite and substructures. During the bainite transformation process, bainite transformation is delayed due to the drag effect, which is induced by the segregation of RE at the ferrite interphase and the retardation of Fe-C-RE (segregation units) on carbon diffusion.
机译：对Si-Mn-Mo钢试样进行了等温热处理，并用DIL805A / D差示膨胀仪绘制了时间-温度-转变曲线（C曲线）。通过采用固体和分子的经验电子理论，Johnson-Mehl-Avrami方程计算，膨胀法和金相学，系统地研究了稀土元素对贝氏体转变动力学的影响。实验结果表明，在Si-Mn-Mo贝氏体钢中添加RE会导致C曲线向右下方移动，并延长贝氏体转变的潜伏期。此外，添加稀土元素会增加相结构因子（n（A），F（C）（D））和贝氏体转变的活化能，抑制粒状贝氏体的形成，并细化贝氏体铁素体和子结构的微观结构。在贝氏体转变过程中，贝氏体转变由于阻力效应而延迟，这是由RE在铁素体相间的偏析和Fe-C-RE（偏析单元）对碳扩散的阻滞引起的。

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