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首页> 外文期刊>Journal of Materials Engineering and Performance >Dynamic Recrystallization and Grain Refinement of Fe-P-C-Si and Fe-P-C-Si-N Steels
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Dynamic Recrystallization and Grain Refinement of Fe-P-C-Si and Fe-P-C-Si-N Steels

机译：Fe-P-C-Si和Fe-P-C-Si-n钢的动态再结晶和晶粒细化

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摘要

Grain refinement is an effective technique to improve the mechanical properties of steels. In the present work, single-pass hot compression experiments have been conducted on two different compositions of high phosphorous steels to study the microstructural evolution and ferrite grain refinement at various strain rates and deformation temperatures, i.e., 0.01-10?s_(?1)and 750-1050?°C, respectively. Optical metallography has been employed to understand the physical processes that take place during hot deformation process. The results indicate that when these compositions of high phosphorous steels are worked at relatively low temperatures in the intercritical regions, a ferrite grain size of 5-7?μm is obtained. It is observed that the grain size decreases with an increase in strain rate and with the decrease in deformation temperature. Based on the values of stress exponent ( n ) obtained in the present work, dislocation creep is identified as the deformation mechanism. The activation energies for deformation of these two types of high phosphorous steels have been calculated. The effect of the alloying elements on the stress–strain curve, microstructure, and grain refinement has been discussed.
机译：晶粒细化是提高钢材力学性能的有效方法。在目前的工作中，对两种不同成分的高磷钢进行了单道次热压缩试验，以研究在不同应变速率和变形温度（即0.01-10？）下的显微组织演变和铁素体晶粒细化？s_（？1）和750-1050？摄氏度。光学金相学被用来理解热变形过程中发生的物理过程。结果表明，当这些高磷钢成分在亚临界区的相对较低温度下工作时，铁素体晶粒尺寸为5-7？获得了μm。观察到晶粒尺寸随应变速率的增加和变形温度的降低而减小。根据本工作中获得的应力指数（n）值，确定位错蠕变为变形机制。计算了这两种高磷钢的变形活化能。讨论了合金元素对应力应变曲线、显微组织和晶粒细化的影响。

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