图  1   拉伸试样的尺寸

Figure  1.   Size of tensile specimen

图  2   应力松弛试样的尺寸

Figure  2.   Size of stress relaxation specimen

图  3   不同温度拉伸时试验合金的真应力-真应变曲线

Figure  3.   True stress-true strain curves of test alloy in tension at different temperatures

图  4   不同温度下试验合金的应力松弛曲线

Figure  4.   Stress relaxation curves of test alloy at different temperatures

图  5   三次延迟函数拟合得到GH4169合金在不同温度下的应力松弛曲线与试验数据的对比

Figure  5.   Comparison between stress relaxation curves fitted by cubic delay function and test data of GH4169 alloy at different temperatures

图  6   计算得到GH4169合金在不同温度下的蠕变应变速率-真应力曲线

Figure  6.   Creep strain rate-true stress curves of GH4169 alloy at different temperatures by calculation

图  7   拟合得到GH4169合金在不同温度下的ln $\dot{\epsilon }$-ln σ曲线

Figure  7.   ln $\dot{\epsilon }$-ln σ curves of GH4169 alloy at different temperatures by fitting

图  8   不同应力指数和不同温度下${\dot{\epsilon }}^{1/n_{{}_1}}$-σ拟合曲线

Figure  8.   ${\dot{\epsilon }}^{1/n_{{}_1}}$-σ fitting curves at different stress exponents and temperatures

图  9   不同温度下ln $\dot{\epsilon }$ - ln{sinh[α(σ−σ_th)]}拟合曲线

Figure  9.   ln $\dot{\epsilon }$-ln{sinh[α(σ−σ_th)]} fitting curves at different temperatures

图  10   不同温度下的ln $\dot{\epsilon }$-(σ−σ_th)拟合曲线

Figure  10.   ln $\dot{\epsilon }$-(σ−σ_th) fitting curves at different temperatures

图  11   不同σ−σ_th下的ln $\dot{\epsilon }$-1/T拟合曲线

Figure  11.   ln $\dot{\epsilon }$-1/T fitting curves at different values ofσ−σ_th

图  12   应力松弛试验有限元模型

Figure  12.   Finite element model of stress relaxation test

图  13   不同温度下基于未修正Arrhenius模型、修正Arrhenius模型模拟得到的应力松弛曲线与试验结果的对比

Figure  13.   Comparison between simulated stress relaxation curves by unmodified Arrhenius model, modified Arrhenius model and test results at different temperatures