中间道次退火对Ti-3Al-2.5V管材组织和性能的影响

朱小勇; 邢远; 江健; 王莹; 栾佰峰

doi:10.7513/j.issn.1004-7638.2023.03.007

中间道次退火对Ti-3Al-2.5V管材组织和性能的影响

doi: 10.7513/j.issn.1004-7638.2023.03.007

1.
轻金属科学与技术重庆市重点试验室, 重庆大学材料科学与工程学院, 重庆 400030
2.
成都先进金属材料产业技术研究院股份有限公司, 四川成都 610300

详细信息

中图分类号: TF823,TG166.5
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- 被引次数: 0
出版历程
- 收稿日期: 2022-11-12
- 刊出日期: 2023-06-30

Effect of intermediate pass annealing on the microstructures and properties of Ti-3Al-2.5V tubes

1.
Chongqing Key Laboratory of Light Metal Science and Technology, School of Materials Science and Engineering, Chongqing University, Chongqing 400030, China
2.
Chengdu Advanced Metal Materials Industrial Technology Research Institute Co., Ltd., Chengdu 610300, Sichuan, China

摘要

摘要: 冷轧态及退火态样品的微观组织采用EBSD和TEM进行表征，进而探究Ti-3Al-2.5V管材在热处理过程中的再结晶过程，通过极图和反极图分析了不同热处理过程中织构的变化。试验结果表明，在低于580 ℃热处理时，此阶段冷轧管材主要发生回复，微观组织以变形组织为主，管材完全再结晶过程在750 ℃热处理时才会出现。分析表明，管材冷轧形成了沿周向（TD）方向倾斜的基面双峰织构，随热处理温度升高，基面双峰织构类型并未改变，而再结晶织构<$ { 11{\bar 2}0 }$>//AD逐渐取代<$ {10{\bar 1}0} $>//AD形变织构。合金管材在620～650 ℃温度范围内退火时，力学性能发生明显变化，这主要归因于在此温度敏感区间内，随着温度升高再结晶程度急剧增大。
- Ti-3Al-2.5V合金 /
- 中间道次退火 /
- 再结晶 /
- 织构
Abstract: By using EBSD and TEM techniques, the microstructures of the deformation and annealed samples were characterized. After that, the recrystallization process of the tubes during the heat treatments was examined, and the changes in the texture during the various heat treatments were analyzed using polar and inverse polar figures. The experimental results show that when the heat treatment temperature is below 580 ℃, the tube mainly recovers and the microstructure is mainly consisted of the deformed grains. The complete recrystallization process of the tube will occur only when the heat treatment is conducted at 750 ℃. The research demonstrates that the cold-rolled tubes produce a basal bimodal texture with a circumferential (TD) tilt, and that the type of basal bimodal texture produced remains constant as the heat treatment temperature rises, while the recrystallization texture <${11{\bar 2}0 }$>//AD gradually replaced the deformation texture <${10{\bar 1}0}$>//AD. The mechanical properties of the alloy tubes after annealing at 620 ～ 650 ℃ change obviously, which is ascribed to the sharp increase in the recrystallization ratio with the rise in temperature.
- Ti-3Al-2.5V alloy /
- intermediate pass annealing /
- recrystallization /
- texture

HTML全文

图 1 管材变形态及在550～800 ℃热处理1 h的EBSD反极图

Figure 1. EBSD pole of tubes after heat treatment at 550～800 ℃ for 1 h

下载: 全尺寸图片幻灯片

图 2 管材冷轧态及在系列温度下退火1 h后再结晶组织分布

Figure 2. Distribution of the recrystallized microstructures of tubes after deformation and 1 h annealing at successive temperatures

下载: 全尺寸图片幻灯片

图 3 管材在系列温度下热处理1 h的形变组织、亚结构和再结晶比例

Figure 3. Deformation structure, substructure and recrystallization scale diagrams of tubes after 1 h heat treatment at various temperatures

下载: 全尺寸图片幻灯片

图 4 管材在620 ℃热处理1 h的TEM组织特征

Figure 4. TEM characteristics of tubes thermally treated at 620 ℃ for 1 h

下载: 全尺寸图片幻灯片

图 5 管材在800 ℃热处理1 h的TEM组织特征

Figure 5. TEM characteristics of tubes thermally treated at 800 ℃ for 1 h

下载: 全尺寸图片幻灯片

图 6 管材不同晶面的极图

Figure 6. The pole figure of the different crystal planes of tubes

下载: 全尺寸图片幻灯片

图 7 管材沿AD方向的反极图

（a）变形态（b）550 ℃-1 h（c）580 ℃-1 h（d）620 ℃-1 h（e）650 ℃-1 h（f）700 ℃-1 h（g）750 ℃-1 h（h）800 ℃-1 h

Figure 7. Inverse pole figure of the tube along AD direction

下载: 全尺寸图片幻灯片

图 8 管材变形态和系列温度热处理1 h后的显微硬度

Figure 8. Microhardness after deformation and heat treatment at various temperatures for 1 h

下载: 全尺寸图片幻灯片

表 1 TA18管材化学成分

Table 1. Chemical composition of TA18 tubes %

Al V Fe C N O H Ti

2.5～3.5 2.0～3.0 0.30 0.05 0.025 0.12 0.015 余量

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