發(fā)布時間：2018-10-29 18:09

【摘要】：為了獲得7A04鋁合金在矩形波磁場下晶粒尺寸及凝固冷卻曲線的變化規(guī)律,結(jié)合有限元數(shù)值模擬方法分析熔體內(nèi)部磁感應(yīng)強度、電磁力及磁能分布情況,研究了矩形波磁場特性對晶粒細(xì)化效果的影響。結(jié)果表明,在矩形波磁場作用下,7A04鋁合金凝固組織得到不同程度的均勻細(xì)化。最佳矩形波磁場參數(shù):頻率為20Hz,峰值電流為100A,電流占空比為20%處理后,鑄錠中心處、1/2半徑處、邊緣處晶粒平均尺寸分別為122.9、120.4、114.7μm,較未處理鑄錠平均晶粒尺寸分別降低了24.3%、15.3%、22.6%。此時熔體內(nèi)單周期產(chǎn)生電磁力密度最大值為7.01×104 N/m3,磁能密度為3 862.62J/m3,形成了良好的凝固條件。
[Abstract]:In order to obtain the variation rule of grain size and solidification cooling curve of 7A04 aluminum alloy under rectangular wave magnetic field, the magnetic induction intensity, electromagnetic force and magnetic energy distribution in melt were analyzed with finite element numerical simulation method. The effect of magnetic field characteristics of rectangular wave on grain refinement was studied. The results show that the solidified microstructure of 7A04 aluminum alloy is uniformly refined in varying degrees under the action of rectangular wave magnetic field. The optimum rectangular wave magnetic field parameters are as follows: frequency is 20Hz, peak current is 100A, and duty cycle is 20%, the average grain size at the center of the ingot, at the radius of 1 / 2, and at the edge is 122.9120.4114.7 渭 m, respectively. Compared with the average grain size of untreated ingot, the average grain size of the ingot is reduced by 24.3% and 15.3%, respectively. The maximum electromagnetic force density is 7.01 脳 10 ~ 4 N / m ~ (3) and the magnetic energy density is 3 862.62 J / m ~ (3).
【作者單位】： 內(nèi)蒙古科技大學(xué)材料與冶金學(xué)院;
【分類號】：TG146.21

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