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本文给出了Ti679合金材在500℃,475℃,450℃三种温度下的持久等温线,导出了等温线上转折点的应力与实验温度的关系式。给出了在500℃,475℃,450℃几种不同应力条件下的蠕变曲线,导出了在475℃～500℃蠕变激活能与实验应力的关系式。根据本实验数据归纳出可借以描述应力σ、温度T、断裂时间t之间关系的两个参量e~(C/T)·lgt和(T+c)·lgt,并对用之得出的回归方程与用拉尔森-米勒的参量(c+lgt)·T得出的方程,在本实验范围内,对回归效果进行了对比。本文还预测了2·10~4小时500℃等条件下的持久强度。
In this paper, the permanent isothermal curves of Ti679 alloy at 500 ℃, 475 ℃ and 450 ℃ are given. The relationship between the stress and the experimental temperature at the turning point of the isotherms is derived. The creep curves under different stress conditions of 500 ℃, 475 ℃ and 450 ℃ are given, and the relationship between the creep activation energy and experimental stress at 475 ℃ ~ 500 ℃ is derived. Based on the experimental data, two parameters e ~ (C / T) · lgt and (T + c) · lgt, which can describe the relationship between stress σ, temperature T and breaking time t, The regression equation and the equation derived from the Larson-Miller parameter (c + lgt) · T are compared for regression results within the scope of this experiment. The article also predicts the lasting strength at 500 ℃ for 2 ~ 10 ~ 4 hours.