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采用Gleeble-3500热模拟实验机对新型喷射成形镍基高温合金在1050~1140℃,应变速率为0.01~10.0 s-1,最大工程应变量为80%的条件下,进行了等温恒应变轴向压缩热变形实验。确定了该合金最佳热变形条件为温度1050℃,应变速率10.0 s-1,工程应变量20%~60%;分析了变形条件对流变应力、峰值应力及软化系数的影响规律,在相同的应变速率下,随着温度的升高,峰值应力降低;在相同的实验温度下,随着应变速率的升高,峰值应力降低;软化系数增加。计算了该喷射成形合金的热变形激活能为920.74 kJ.mol-1,从而确定了该合金的本构方程,经验算此方程较好地描述该合金的变形特点。
Using Gleeble-3500 thermal simulator, the isothermal constant axial strain was obtained under the conditions of 1050 ~ 1140 ℃, strain rate of 0.01 ~ 10.0 s-1 and maximum strain of 80% Compression heat deformation experiment. The optimum thermal deformation conditions of the alloy were determined as 1050 ℃, strain rate 10.0 s-1 and engineering strain 20% -60%. The influence of deformation conditions on the flow stress, peak stress and softening coefficient were analyzed. At the same strain rate, the peak stress decreases with increasing temperature. With the increase of strain rate, the peak stress decreases and the softening coefficient increases. The thermal deformation activation energy of the alloy was calculated to be 920.74 kJ · mol-1, and the constitutive equation of the alloy was determined. The equation is well described to describe the deformation characteristics of the alloy.