锻压技术

Ti-46.5Al-2.5V-1.0Cr-0.3Ni合金开坯过程的组织预报模型

英文标题：Prediction model for microstructure evolution of Ti-46.5Al-2.5V-1.0Cr-0.3Ni alloy during cogging

作者：司家勇高帆张继

分类号：TG376.2

出版年,卷(期):页码：2011,36(5):137-143

摘要：

利用Gleeble1500热模拟机进行了铸态Ti-46.5A-2.5V-1.0Cr-0.3Ni合金高温热压缩实验，研究了其在1000～1200℃和0.001～1.0 s-1条件下开坯时的显微组织转变过程，并采用定量金相方法对TiAl合金在不同变形工艺参数条件下的微观组织特征进行了实验研究和量化描述。根据实验结果建立了TiAl合金热变形过程中的动态再结晶百分数模型和动态再结晶晶粒尺寸模型，可为预测和控制TiAl合金高温锻造开坯工艺提供理论依据。

The microstructure evolution process of cast Ti-46.5Al-2.5V-1.0Cr-0.3Ni alloy during cogging process in the temperature range of 10001200 ℃ and strain rate range of 0.0011.0 s-1 was studied by hot compressing testing on a Gleeble1500 simulator. And the characteristic of deformed microstructure with different technological parameters was studied and quantized by quantitative metallography method. Based on the experimental results, the model of dynamic recrystallization volume fraction and dynamic recrystallization grain size were set up in order to predict microstructure and grain size of cast TiAl alloy during cogging process.

基金项目：

863国家高技术研究发展计划（2006AA03A204)；中南林业科技大学青年科学研究基金重点资助项目（QJ2010001A）

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