选取三种氧含量分别为140ppm、280ppm、410ppm的FGH96高温合金为材料,按Φ10×15mm加工成热压缩试样,使用电子分析天平精确称重,确保试样质量符合实验要求。将高温合金试样放置在Gleeble热模拟实验机上,在不同温度(1040℃、1070℃、1100℃、1140℃)和应变速率(0.001 s⁻¹、0.01 s⁻¹、0.1 s⁻¹、1 s⁻¹)条件下进行热压缩实验,记录每个条件下的流变应力曲线。根据流变应力与应变速率、温度的关系,利用Arrhenius方程计算热变形激活能,对不同温度和应变速率下的实验数据进行线性拟合,得到激活能的计算结果。
Three types of FGH96 superalloys with oxygen contents of 140ppm, 280ppm and 410ppm respectively were selected as materials and processed into hot-compressed samples with diameters of Φ10×15mm. The samples were precisely weighed using an electronic analytical balance to ensure that the sample quality met the experimental requirements. The superalloy specimens were placed on the Gleeble thermal simulation testing machine. Thermal compression experiments were conducted under different temperatures (1040℃, 1070℃, 1100℃, 1140℃) and strain rates (0.001 s⁻¹, 0.01 s⁻¹, 0.1 s⁻¹, 1 s⁻¹), and the rheological stress curves under each condition were recorded. Based on the relationship between rheological stress and strain rate as well as temperature, the activation energy of thermal deformation was calculated using the Arrhenius equation. The experimental data under different temperatures and strain rates were linearly fitted to obtain the calculation results of the activation energy.