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钛合金大型复杂整体构件等温局部加载成形中的多道次热循环特性是影响组织形态的重要因素,文章设计并完成了多道次热循环实验,定量研究了循环参数对TA15钛合金组织形态的影响。结果表明,多道次热循环对最终组织的影响可看作不同初始组织和单一热循环对组织的共同作用;初始等轴组织经过热循环可获得双态组织,初生等轴α相(αp)体积分数和晶粒尺寸随着温度的升高均先缓慢变化然后加速降低;初始双态组织进行热循环可获得三态组织,其中αp形态接近初始组织,片层α相(αs)体积分数随温度升高呈指数型下降,αs平均厚度则缓慢增加;初始三态组织进行热循环仍然可获得三态组织,其中αp的体积分数和尺寸略微增大,αs体积分数随温度升高仍呈指数型下降,αs平均厚度先增加后减小。研究结果可为TA15钛合金等温局部加载成形过程中的微观组织预测与控制提供依据。
Multi-pass thermal cycling in isothermal partial loading of large-scale titanium alloy monoliths is an important factor that affects the morphology of the titanium alloy. Multi-pass thermal cycling experiments were designed and completed. The effects of cyclic parameters on the morphology of TA15 titanium alloy influences. The results show that the effect of multi-pass thermal cycles on the final microstructure can be regarded as a synergistic effect of different initial and single thermal cycles on the microstructure. The volume fraction and grain size both change slowly and then decrease with the increase of temperature. The initial two-phase microstructure can be obtained by thermal cycling. The αp morphology is close to the initial microstructure. The volume fraction of α-phase High exponential decline, the average thickness of αs is slowly increased; the initial three-state tissue thermal cycling can still get tri-state organization, in which αp volume fraction and size slightly increased, αs volume fraction is still exponential decline with increasing temperature , αs average thickness first increased and then decreased. The results provide the basis for the prediction and control of the microstructure in TA15 titanium isothermal partial loading process.