锻压技术

热处理工艺对TA15钛合金热挤压管材显微组织及性能的影响

英文标题：Influence of heat treatment process on microstructure and properties of hot extrusion pipe for TA15 titanium alloy

分类号：TG166.5

出版年,卷(期):页码：2025,50(2):222-226

摘要：

研究了650~850 ℃两相区热处理工艺对大规格TA15钛合金热挤压管材显微组织及性能的影响。显微组织研究结果表明:在650~750 ℃退火处理时，TA15钛合金热挤压管材的显微组织仅部分发生再结晶，且随着退火温度的升高，再结晶程度加强，晶粒细化，晶粒等轴化程度加强；在800~850 ℃退火时，显微组织呈完全再结晶状态，且随着退火温度的升高，初生α相比例降低，被破碎的初生α相进一步再结晶等轴化细化，同时次生片层α相逐渐析出粗化长大;当退火温度升高至850 ℃时，次生片层α相显著粗化。力学性能结果表明:在650~850 ℃退火时，抗拉强度和规定非比例延伸强度随着退火温度的升高先下降后升高，在850 ℃时达到峰值；断后伸长率和断面收缩率随着退火温度的升高先升高后下降，在700 ℃时达到峰值；冲击性能随着退火温度的升高而下降。

The influences of heat treatment process on the microstructure and properties of large-size TA15 titanium alloy hot extrusion pipe in two-phase zone at 650-850 ℃ were studied. The results of microstructure study show that when annealed at 650-750 ℃, only partially recrystallizes occurs in the microstructure of TA15 titanium alloy hot extrusion pipe,and with the increasing of annealing temperature, the recrystallization degree is enhanced, the grain is refined, and the grain equiaxed degree is enhanced. When annealed at 800-850 ℃, the microstructure is completely recrystallized,and with the increasing of annealing temperature, the proportion of primary α phase decreases, and the crushed primary α phase is further recrystallized and equiaxed. At the same time, the secondary layer α phase gradually precipitates and coarsens. When the annealing temperature rises to 850 ℃, the secondary layer α phase coarsens significantly. The results of mechanical properties show that when annealed at 650-850 ℃, the tensile strength and specified non-proportional elongation strength first decrease and then increase with the increasing of annealing temperature, and peak at 850 ℃. The elongation at break and the cross-sectional shrinkage first increase and then decrease with the increasing of temperature, and peak at 700 ℃. The impact performance decreases with the increasing of annealing temperature.

基金项目：

国家重点研发计划项目（2022YFB3705604）

作者简介：任伟宁（1995-），男，硕士，工程师,E-mail：18702986272@163.com

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