热冲压硼钢非等温奥氏体相变动力学模型
发布时间：2018-08-18 19:45
【摘要】：利用Gleeble-3500热模拟试验机对热冲压硼钢进行了线膨胀试验,得到了不同加热速度下硼钢奥氏体化动力学曲线;研究了加热速度对相变过程的影响,结果显示,加热速度越高,获得相同体积分数的奥氏体所需的时间越短,且奥氏体开始转变温度升高,当加热温度介于Ac1和Ac3时,奥氏体体积分数转变速度随着加热温度的升高先增大后减小。根据奥氏体形核长大理论,考虑加热速度的影响,建立了非等温条件下热冲压硼钢的统一奥氏体相变动力学模型。利用遗传算法确定并优化了硼钢奥氏体化动力学模型中的材料常数,所得材料常数确定的相变模型能够较好的描述硼钢连续加热过程线膨胀曲线,并能够较好地预测硼钢在不同加热速度下的奥氏体体积分数。
[Abstract]:The linear expansion test of hot stamping boron steel was carried out by using Gleeble-3500 thermal simulator, and the austenitization kinetics curves of boron steel at different heating rates were obtained, and the effect of heating rate on the transformation process was studied. The results showed that the higher the heating rate was, the higher the heating rate was. The shorter the time is to obtain austenite with the same volume fraction, and the higher the austenite transformation temperature is, when the heating temperature is between Ac1 and Ac3, the transformation rate of austenite volume fraction increases first and then decreases with the increase of heating temperature. According to austenite nucleation and growth theory and considering the effect of heating rate, a unified austenitic transformation kinetic model of hot stamping boron steel under non-isothermal condition was established. The material constants in the austenitizing kinetics model of boron steel are determined and optimized by genetic algorithm. The transformation model determined by the obtained material constants can well describe the linear expansion curve of the continuous heating process of boron steel. The volume fraction of austenite of boron steel at different heating rates can be predicted well.
【作者单位】： 钢铁研究总院先进金属材料涂镀国家工程实验室;首钢技术研究院薄板所;北京科技大学机械工程学院;
【基金】：北京市科技计划资助项目(D15110300350000)
【分类号】：TG142.1;TG306
[Abstract]:The linear expansion test of hot stamping boron steel was carried out by using Gleeble-3500 thermal simulator, and the austenitization kinetics curves of boron steel at different heating rates were obtained, and the effect of heating rate on the transformation process was studied. The results showed that the higher the heating rate was, the higher the heating rate was. The shorter the time is to obtain austenite with the same volume fraction, and the higher the austenite transformation temperature is, when the heating temperature is between Ac1 and Ac3, the transformation rate of austenite volume fraction increases first and then decreases with the increase of heating temperature. According to austenite nucleation and growth theory and considering the effect of heating rate, a unified austenitic transformation kinetic model of hot stamping boron steel under non-isothermal condition was established. The material constants in the austenitizing kinetics model of boron steel are determined and optimized by genetic algorithm. The transformation model determined by the obtained material constants can well describe the linear expansion curve of the continuous heating process of boron steel. The volume fraction of austenite of boron steel at different heating rates can be predicted well.
【作者单位】： 钢铁研究总院先进金属材料涂镀国家工程实验室;首钢技术研究院薄板所;北京科技大学机械工程学院;
【基金】：北京市科技计划资助项目(D15110300350000)
【分类号】：TG142.1;TG306
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