【摘要】：利用Gleeble-3500熱模擬試驗機對熱沖壓硼鋼進行了線膨脹試驗,得到了不同加熱速度下硼鋼奧氏體化動力學曲線;研究了加熱速度對相變過程的影響,結果顯示,加熱速度越高,獲得相同體積分數(shù)的奧氏體所需的時間越短,且奧氏體開始轉變溫度升高,當加熱溫度介于Ac1和Ac3時,奧氏體體積分數(shù)轉變速度隨著加熱溫度的升高先增大后減小。根據(jù)奧氏體形核長大理論,考慮加熱速度的影響,建立了非等溫條件下熱沖壓硼鋼的統(tǒng)一奧氏體相變動力學模型。利用遺傳算法確定并優(yōu)化了硼鋼奧氏體化動力學模型中的材料常數(shù),所得材料常數(shù)確定的相變模型能夠較好的描述硼鋼連續(xù)加熱過程線膨脹曲線,并能夠較好地預測硼鋼在不同加熱速度下的奧氏體體積分數(shù)。
[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.
【作者單位】： 鋼鐵研究總院先進金屬材料涂鍍國家工程實驗室;首鋼技術研究院薄板所;北京科技大學機械工程學院;
【基金】：北京市科技計劃資助項目(D15110300350000)
【分類號】：TG142.1;TG306

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