北京科技大学学报Issue(7)：925-930,6.DOI:10.13374/j.issn1001-053x.2014.07.011
基于球化机理的TA15钛合金热变形统一本构模型
Unified constitutive model of TA15 titanium alloy in hot deformation based on the globularization mechanism
摘要
Abstract
Globularization of lamellar α phase was stated by the grain boundary separating model. It was elucidated that globu-larization of secondary ( lamellar) αphase in the transformed microstructure is the main flow softening mechanism of TA15 titanium al-loy. A unified viscoplastic constitutive equation of TA15 titanium alloy was developed based on the globularization mechanism. Some physical variables including globularization of secondary ( lamellar) αphase, normalized dislocation density, isotropic hardening, plas-tic deformation induced temperature rise, and phase transformation during deformation were comprehensively considered in the constitu-tive model. Material constants in the constitutive model were determined and optimized by a genetic algorithm. The constitutive model can accurately predict the flow stress of TA15 titanium alloy in hot deformation.关键词
钛合金/球化/本构模型/遗传算法/材料常数Key words
titanium alloys/globularization/constitutive models/genetic algorithms/material constants分类
矿业与冶金引用本文复制引用
赵慧俊,王宝雨,刘钢,杨雷..基于球化机理的TA15钛合金热变形统一本构模型[J].北京科技大学学报,2014,(7):925-930,6.基金项目
现代交通金属材料与加工技术北京实验室资助项目 （）
高等学校博士学科点专项科研基金资助项目(20120006110017) （20120006110017）
