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本文研究了TC 6钛合金四种组织(片状、网蓝、等轴及双态组织)室温及400℃下的拉伸性能及应变低周疲劳行为。双态组织具有最高的拉伸强度和最佳的低周疲劳性能,等轴组织次之,片状组织最差。四种组织在室温疲劳过程中均呈现循环软化。在400℃,片状组织呈现循环软化,而其它三种组织先循环软化而后循环硬化。网蓝及等轴组织室温拉伸时出现的吕德丝(Lüder)效应,导致了在室温应变疲劳过程中出现较大应变量对应较小应力的情况。
In this paper, the tensile properties and strain low cycle fatigue behavior of four kinds of TC 6 titanium alloy (flake, net blue, equiaxed and bimodal) at room temperature and 400 ℃ were studied. Bimodal tissue with the highest tensile strength and the best low cycle fatigue properties, followed by the equiaxed, the worst flake. Four kinds of organizations show cyclic softening during the room temperature fatigue. At 400 ℃, the sheet-like tissue shows cyclic softening, while the other three kinds of tissue first cycle softening and then harden. The Lüder effect that occurs when the web blue and equiaxial tissue are stretched at room temperature leads to a situation where a larger amount of strain corresponds to a smaller stress at room temperature during strain fatigue.