(1.浙江大學(xué) 機(jī)械與能源工程學(xué)院，杭州 310027;
2.哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱 150001)
摘 要: 針對新型亞穩(wěn)定β型鈦合金——Ti-15-3合金，將物理模擬與數(shù)值模擬相結(jié)合，采用3維熱力耦合剛粘塑性有限元模型與3層向后傳播的人工神經(jīng)網(wǎng)絡(luò)模型相結(jié)合的方法，開發(fā)了一個(gè)相應(yīng)的有限元數(shù)值模擬系統(tǒng)，對Ti-15-3合金筒形件的熱反擠成形過程進(jìn)行了數(shù)值模擬。模擬結(jié)果與試驗(yàn)結(jié)果吻合較好，說明本文的熱力耦合理論分析、流變應(yīng)力的神經(jīng)網(wǎng)絡(luò)預(yù)測模型以及所開發(fā)的數(shù)值模擬系統(tǒng)是可靠的。該模擬結(jié)果為建立Ti-15-3合金熱反擠成形過程中顯微組織預(yù)測模型奠定了良好的基礎(chǔ)。
關(guān)鍵字: Ti-15-3合金；熱反擠；熱力耦合；數(shù)值模擬
thermo-mechanical behavior of
Ti-15-3 alloy during back-extrusion
（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 backextrusion 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
