Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第12卷    第3期    总第48期    2002年6月

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文章编号:1004-0609(2002)03-0578-04
Ti-15-3合金反挤成形的热力耦合数值模拟
李  萍1,2,薛克敏2,吕  炎2,谭建荣1

(1.浙江大学 机械与能源工程学院,杭州 310027;
2.哈尔滨工业大学 材料科学与工程学院,哈尔滨 150001
)

摘 要: 针对新型亚稳定β型钛合金——Ti-15-3合金,将物理模拟与数值模拟相结合,采用3维热力耦合刚粘塑性有限元模型与3层向后传播的人工神经网络模型相结合的方法,开发了一个相应的有限元数值模拟系统,对Ti-15-3合金筒形件的热反挤成形过程进行了数值模拟。模拟结果与试验结果吻合较好,说明本文的热力耦合理论分析、流变应力的神经网络预测模型以及所开发的数值模拟系统是可靠的。该模拟结果为建立Ti-15-3合金热反挤成形过程中显微组织预测模型奠定了良好的基础。

 

关键词: Ti-15-3合金;热反挤;热力耦合;数值模拟

Numerical simulation of coupled
 thermo-mechanical behavior of
Ti-15-3 alloy during back-extrusion
LI Ping1,2,XUE Ke-min2,Lü Yan2, TAN Jian-rong1

1.College of Mechanical and Energy Engineering,
Zhejiang University, Hangzhou 310027, China;
2.School of Materials Science and Engineering,
Harbin Institute of Technology,Harbin 150001, China

Abstract:Ti-15-3 alloy is a new meta-stable β-type titanium alloy. Combining physical simulation with numerical simulation,a FE numerical simulation system was developed to simulate the hot backextrusion process of Ti-15-3 alloy cylinder billet by introducing three layers BP neural network models into 3D thermal-mechanical coupled rigid-viscoplastic finite element model. The results of simulation agree well with the experimental ones. It is shown that the thermo-mechanical analysis, and the neural network models of flow stress as well as the numerical simulation system are reliable. The simulated results lay a good foundation for building a predicting model of microstructure of Ti-15-3 alloy during hot back-extrusion.

 

Key words: Ti-15-3 alloy;hot back-extrusion; thermo- mechanical coupling; numerical simulation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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