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Rene’80合金通过不同温度固溶处理后获得不同数量的两种尺寸的γ’相,即粗立方(～0.40μm)及细球状(0.06～0.09μm)γ’粒子。760℃,55kg/mm~2的第二阶段蠕变速率(?)_S 与细球γ’的直径 d_S 满足以下关系:(?)_S∞(1/d_S)而粗立方γ’对第二阶段蠕变速率没有直接影响,持久寿命 t_f 与第二阶段蠕变速率(?)_S 和持久断裂塑性ε_f 符合以下关系:t_f(?)_s~a=cε_f其中 C=0.77 α=0.87中温蠕变过程中位错亚结构的电镜观察指出,位错主要通过攀移越过细球状γ’而在γ基体中运动。在粗立方γ’中呈现层错干涉条纹,但未观察到位错切过的迹象。按照位错攀移模型导出第二阶段蠕变速率方程,且满足以下关系:(?)_S∞(1/d_S) (?)∞(1/(λ_sV_s~(1/2))(1-(4/π~(1/2))V_s~1/2)与实验数据相符。式中 V_s、d_s 和λ_s,分别为细球状γ’粒子的体积分数、直径和间距。
Rene’80 alloy obtained by different temperature solution treatment of different sizes of two sizes of γ ’phase, namely the rough cubic (~ 0.40μm) and fine spherical (0.06 ~ 0.09μm) γ’ particles. The second-stage creep rate (S) _ S at 760 ° C and 55 kg / mm ~ 2 and the diameter d_S of the fine sphere γ ’satisfy the following relationship: (?) _ S∞ (1 / d_S) The creep rate has no direct effect on the creep rate, and the long-term life t_f corresponds to the second-stage creep rate (?) _S and the ductile fracture plasticity ε_f as follows: t_f (?) _s ~ a = cε_f where C = 0.77 α = Electron microscopic observations of the dislocation substructures indicate that dislocations are mainly moved in the gamma matrix by climbing over the fine spherical gamma prime. Stratified interference fringes appear in the crude cubic γ ’, but no sign of dislocation is observed. The second-stage creep rate equation is derived according to the dislocation climbing model and satisfies the following relationship: (?) _S∞ (1 / d_S) (?) ∞ (1 / (λ_sV_s ~ (1/2) 4 / π ~ (1/2)) V_s ~ 1/2) is consistent with the experimental data, where V_s, d_s and λ_s are the volume fractions, diameters and spacings of the spherical γ ’particles, respectively.