TC4钛合金流动软化行为及本构模型研究

发布时间：2018-04-30 10:41

本文选题：TC钛合金 + 流动软化　；参考：《稀有金属材料与工程》2017年05期

【摘要】：利用Gleeble-3500热模拟试验机进行等温恒应变速率热压缩实验,研究了TC4钛合金在温度800~950℃、应变速率0.001~10 s~(-1)条件下的流动软化行为。研究发现随变形温度降低和应变速率增大TC4钛合金的流动软化程度增大,且800~850℃、应变速率1~10 s~(-1)变形时的流动软化主要是塑形流动失稳引起的,温度900~950℃、应变速率0.001~0.1 s~(-1)条件变形时,流动软化主要是片状α相的等轴化引起的。引入应变对材料常数α、n、A和Q的影响,建立了考虑应变的TC4钛合金Arrhenius本构方程,建立的本构模型精度较好,在800,850℃和10 s~(-1)条件以及在900,950℃和0.1 s~(-1)条件下,模型平均绝对误差分别为4.2%和4.3%。TC4钛合金的平均变形激活能为403 kJ/mol,平均应变速率敏感指数为0.26。
[Abstract]:The flow softening behavior of TC4 titanium alloy under the condition of temperature 800~950 C and strain rate 0.001~10 s~ (-1) was studied by Gleeble-3500 thermal simulation test machine. It was found that the flow softening degree of TC4 titanium alloy increased with the decrease of deformation temperature and the increase of strain rate, and the strain rate was 1 at 800~850 C. The flow softening of ~10 s~ (-1) deformation is mainly caused by the instability of plastic flow, the temperature 900~950 C, the strain rate 0.001~0.1 s~ (-1) condition deformation, the flow softening is mainly caused by the ISO axis of the sheet phase alpha phase. The strain on the material constant alpha, N, A and Q is introduced, and the constitutive equation of TC4 titanium alloy considering strain is established, and the establishment of the constitutive equation of the TC4 titanium alloy Arrhenius constitutive equation is established. Under the conditions of 800850 and 10 s~ (-1) and at 900950 and 0.1 s~ (-1), the average absolute error of the model is 4.2% and the average deformation activation energy of the 4.3%.TC4 titanium alloy is 403 kJ/mol, and the average strain rate sensitivity index is 0.26..

【作者单位】：南昌大学;南昌航空大学;
【基金】：国家自然科学基金(51164030) 航空科学基金(2014ZE56015)
【分类号】：TG146.23

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