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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Dynamic recrystallization behavior and microstructural evolution in a Mn-Cr gear steel
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Dynamic recrystallization behavior and microstructural evolution in a Mn-Cr gear steel

机译:Mn-Cr齿轮钢的动态再结晶行为和组织演变

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Using a Gleeble 1500 hot simulator, the dynamic recry stallization (DRX) behavior and changes of DRX grain size of a Mn-Cr type gear steel have been investigated at deformation temperatures of 900-1150 deg C, strain rates of 0.1-1 s~(_1), and initial austenite grain sizes of 70-150 mu m. The experimental results show that the Mn-Cr gear steel exhibits a typical DRX behavior under higher deformation temperatures, lower strain rates and smaller initial austenite grain sizes. The DRX takes place under the conditions with Zener-Hollomon parameter (Z) less than a critical value Z_c. The DXR grains are formed by the bulging mechanism. By regression analysis, activation energy and stress exponent were determined to be 378.6 kJ/mol and 5.8, respectively. The complete DRX grain size is a power law function of Z with an exponent of -0.25. The reason why Z parameter determines uniquely the DRX grain size was analyzed.
机译:使用Gleeble 1500热仿真器,研究了变形温度为900-1150℃,应变速率为0.1-1 s〜时Mn-Cr型齿轮钢的动态重结晶失速(DRX)行为和DRX晶粒尺寸的变化。 (_1),初始奥氏体晶粒尺寸为70-150微米。实验结果表明,Mn-Cr齿轮钢在较高的变形温度,较低的应变速率和较小的初始奥氏体晶粒尺寸下表现出典型的DRX行为。 DRX在齐纳-所罗门参数(Z)小于临界值Z_c的条件下发生。 DXR晶粒是通过鼓胀机制形成的。通过回归分析,活化能和应力指数分别确定为378.6 kJ / mol和5.8。完整的DRX晶粒尺寸是Z的幂律函数,指数为-0.25。分析了Z参数唯一确定DRX晶粒尺寸的原因。

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