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通过不同的热处理制度获得了不同初始组织状态的TC4坯料,然后轧制为准16 mm棒材。分析了不同初始状态棒坯轧制后组织演变规律和显微组织对材料力学性能的影响。结果表明:初始状态对TC4钛合金轧制棒材的组织和性能影响显著,双相组织轧制时,原始等轴初生α几乎没有参与变形,只是发生一定的扭曲;网篮组织和细片层组织轧制时,变形容易,破碎程度较高,可以获得细小等轴的两相组织。轧制时应将加热温度控制在相变点以下40~50℃,避免温度过高对轧制变形产生影响。
TC4 blanks of different initial microstructure were obtained by different heat treatment regimes and then rolled to a quasi-16 mm bar. The microstructure evolution and the effect of microstructure on the mechanical properties of the material after the different initial conditions were analyzed. The results show that the initial state has a significant effect on the microstructure and properties of the TC4 titanium alloy rolled bar. In the dual-phase structure rolling process, the primary equiaxed α almost does not participate in the deformation, but only some distortion occurs. Tissue rolling, deformation easy, higher degree of fragmentation, you can get a small two-phase equiaxed organization. Rolling temperature should be controlled at the transformation point below 40 ~ 50 ℃, to avoid excessive temperature on rolling deformation.