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TC4 钛合金两相区的热变形行为及微观组织
Thermal Deformation Behavior and Microstructure of TC4 Titanium Alloy in Two-phase Region
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- DOI:
- 作者:
- 李东宽 1 ，郭 岩 2 ，杨立新 1 ，张玉芬 1 ，王德勇 1 ， 王 涛 3
LI Dongkuan 1 , GUO Yan 2 , YANG Lixin 1 , ZHANG Yufen 1 , WANG Deyong 1 , WANG Tao 3
- 作者单位:
- 1. 沈阳飞机工业(集团)有限公司；2.空装驻沈阳地区第一军事代表室；3. 西部超 导材料科技股份有限公司
1. Shenyang Aircraft Industry (Group) Co., Ltd.,; 2. First Military Representative Office of the Air Force Equipment Department in Shenyang Area, 3. Western Superconducting Materials Technology Co.,
- 关键词:
- TC4 钛合金；热变形；微观组织
TC4 titanium alloy; thermal deformation; microstructure
- 摘要:
- 以两相区的 TC4 钛合金为研究对象，与生产试验相结合，对两种不同组织状态的钛合金开展两相区的热
模拟试验，建立了本构方程，研究了不同温度、应变速率、变形程度及锻造变形道次对微观组织的影响，建立了 TC4 钛
合金微观组织演化模型。结果表明，两种不同组织钛合金的热变形行为均符合 Hansel-Spittel 本构方程，建立的本构方程
可以有效描述材料的热变形行为。 在 930~975 ℃ 和 0.1~1.0 s -1 应变速率条件下，当真实应变相同时，真实应力随着温度
的升高而减小，随着应变速率的增大而增大；初始组织中 α 相球化程度越高，其真应力应变曲线中所对应的峰值应力越
大。 在两相区不同热变形条件下，随着应变速率的升高， α 相晶粒越细小， α 相的含量变化不大；变形温度的升高，等轴 α
相明显减少；变形程度增加， α 相晶粒越细小；锻造道次增加，两相区 α 相由长条状转变为 10 μm 左右的等轴组织。
Taking TC4 titanium alloy in the two-phase region as the research object, combined with the production test, the
thermal simulation test was carried out on two titanium alloys with different microstructure states, and the constitutive
equation was established. The microstructure evolution model of TC4 titanium alloy was established by studying the effects
of different temperature, strain rate, deformation degree and forging deformation pass on microstructure. The results show
that the thermal deformation behavior of titanium alloys with two different microstructure accords with the Hansel-Spittel
constitutive equation, and the established constitutive equation can describe the thermal deformation behavior of titanium
alloys effectively. Under the condition of 930 ℃ to 975 ℃ and 0.1 s -1 to 1.0 s -1 strain rate, the true stress decreases with the
increase of temperature and increases with the increase of strain rate when the true strain changes phase. The higher the
spheroidization degree of α phase in the initial microstructure, the higher the peak stress corresponding to the true
stress-strain curve. Under different thermal deformation conditions, with the increase of strain rate, the α phase grain
becomes smaller, and the α phase content doesn ’ t change. With the increase of deformation temperature, the equiaxed α
phase decreases obviously. The α phase grain is smaller with the increase of deformation degree. As the forging passes
increase, the α phase in the two-phase region changes from long strip to equiaxed structure of about 10 μm