李璞,陈芝来,王邓彪,等.α-β型钛合金多向模锻微观组织演化规律与机制研究[J].精密成形工程,2025,17(5):57-66.
LI Pu,CHEN Zhilai,WANG Dengbiao,et al.Effect of Multi-directional Forging on Microstructure Evolution and Mechanism of α-β Titanium Alloy[J].Journal of Netshape Forming Engineering,2025,17(5):57-66. |
| α-β型钛合金多向模锻微观组织演化规律与机制研究 |
| Effect of Multi-directional Forging on Microstructure Evolution and Mechanism of α-β Titanium Alloy |
| 投稿时间：2024-07-22 |
| DOI：10.3969/j.issn.1674-6457.2025.05.007 |
| 中文关键词: 钛合金 多向锻造 组织演化 动态再结晶 热变形 |
| 英文关键词: titanium alloy multi-directional forging microstructure evolution dynamic recrystallization hot deformation |
| 基金项目:中国航发集团产学研项目(HFZL2020CXY021);国家自然科学基金(51974259) |
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| 摘要点击次数: 60 |
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| 中文摘要: |
| 目的 以TC6钛合金为对象进行多向锻造试验，观察不同主动模加载作用下合金内部的微观组织演化情况，分析合金多向锻造微观组织演化规律与机制，为α-β型钛合金多向锻造工艺开发与应用提供理论基础和技术支撑。方法 通过不同金属流动行为的多向锻造物理模拟试验设计，分析多向锻造加载方式和参数对TC6钛合金微观组织演化的影响规律，揭示α-β型钛合金多向锻造微观组织演化机制。结果 在TC6钛合金多向锻造中，随着不同方向锻造道次和变形量的增加，合金内部畸变能逐渐增大，微观组织内初生等轴α相尺寸不断减小，片层α相发生快速破碎细化;随着锻造温度的升高，组织内初生等轴α相数量减少、尺寸减小，次生片状α相数量增多，β相动态再结晶明显;与单向锻造变形相比，在多向锻造过程中，TC6钛合金的位错运动相对容易，组织内α相和β相细化更加充分，组织均匀化程度更高。结论 在TC6钛合金多向锻造过程中，微观组织会发生连续动态再结晶，组织内容易形成网状分布的位错，促进中等角度晶界和亚晶的形成，微观组织容易发生细化。 |
| 英文摘要: |
| The work aims to carry out multi-directional forging experiment on TC6 titanium alloy to observe the microstructure evolution of the alloy under different active die loading and analyze the microstructure evolution and mechanism of the alloy subject to multi-directional forging, so as to provide theoretical basis and technical support for the development and application of multi-directional forging process of α-β titanium alloy. Based on various metal flow behaviors, a multi-directional forging physical simulation experiment was designed and the effect of multi-directional forging loading methods and parameters on the microstructure evolution of TC6 alloy was analyzed. Furthermore, the microstructure evolution mechanism during multi-directional forging of α-β titanium alloy was revealed. During multi-directional forging of TC6 alloy, the internal distortion energy increased gradually with the increase of forging passes in different directions and deformation. The size of the primary equiaxed α phase decreased continuously and the lamellar α phase was rapidly broken and refined in the microstructure. As the forging temperature increased, the amount and size of primary equiaxed α phase decreased and the secondary lamellar α phase increased in the microstructure. In addition, the dynamic recrystallization of β phase was more obvious. Compared with the unidirectional forging deformation, the dislocation movement was relatively easy and the α phase and β phase were refined more fully during the multi-directional forging process. The microstructure of the multi-directional forging exhibited a higher degree of homogenization. Continuous dynamic recrystallization occurs in the microstructure of TC6 alloy during multi-directional forging. Network dislocations are found in the microstructure, which promotes the formation of medium-angle grain boundaries and subgrains, resulting in the refinement of the microstructure. |
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