冯瑞,王克鲁,鲁世强,李鑫,欧阳德来,崔霞,周璇,钟明君.BT25钛合金β相区动态再结晶行为及数值模拟[J].稀有金属材料与工程,0,():-.[FENG Rui,WANG Kelu,LU Shiqiang,LI Xin,OUYANG Delai,CUI Xia,ZHOU Xuan,ZHONG Mingjun.Dynamic recrystallization behavior and numerical simulation in β phase of BT25 titanium alloy[J].Rare Metal Materials and Engineering,0,():-].
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BT25钛合金β相区动态再结晶行为及数值模拟
投稿时间:2020-05-11  修订日期:2020-05-30
中文关键词:  BT25钛合金  临界应变模型  DRX动力学方程  DRX体积分数  数值模拟
基金项目:国家自然科学基金资助(项目号51761029, 51864035); 江西省研究生创新专项资金项目(YC2019-S337)
中文摘要:
      利用Gleeble-3500型热模拟试验机对BT25钛合金进行单道次等温压缩实验,分别采用Najafizadeh-Jonas加工硬化率模型和Cingara-McQueen流变应力模型研究了合金在变形温度1040 ~ 1100 ℃,应变速率0.001 ~ 1 s-1和最大压下率为60%的条件下动态再结晶的临界条件,分析真应力-真应变曲线,计算加工硬化率并建立了临界应变模型;同时通过线性回归法计算材料参数,构建JMAK 动态再结晶动力学方程,并采用该模型模拟了BT25钛合金在热变形过程中动态再结晶行为。研究结果显示:流动应力表现出对应变速率和变形温度非常敏感;高温和低应变速率有利于DRX发生;有限元模型对DRX体积分数的预测误差在10%以内,研究结果表明该模型具有良好的预测能力,为工业生产中塑性变形和微观结构的预测提供了有效的工具。
Dynamic recrystallization behavior and numerical simulation in β phase of BT25 titanium alloy
英文关键词:BT25 titanium alloy  critical strain model  DRX dynamic equation  DRX volume fraction  numerical simulation
英文摘要:
      The single-pass isothermal compression test of BT25 titanium alloy was carried out by Gleeble-3500 thermal simulation machine. Najafizadeh-Jonas model of working hardening rate and Cingara-McQueen model of flow stress were used to study the critical conditions of dynamic recrystallization under the conditions of deformation temperature 1040 ~ 1100 ℃, strain rate 0.001 ~ 1 s-1 and maximum height reduction of 60%. The true stress-true strain curve were analyzed, and the critical strain model was established. At the same time, JMAK dynamic recrystallization kinetic equation was constructed by calculating material parameters and linear regression method. A numerical simulation model was developed to simulate the dynamic recrystallization behavior of BT25 titanium alloy during thermal deformation. The results show: The flow stress is sensitive to the strain rate and deformation temperature. High temperature and low strain rate are favorable for DRX. The prediction error of the finite element model for predicting DRX volume fraction is less than 10%. The results show that the model has a good prediction ability and provides an effective tool for predicting plastic deformation and microstructure in industrial production.
作者单位
冯瑞 南昌航空大学航空制造工程学院 
王克鲁 南昌航空大学航空制造工程学院 
鲁世强 南昌航空大学航空制造工程学院 
李鑫 南昌航空大学航空制造工程学院 
欧阳德来 南昌航空大学材料科学与工程学院 
崔霞 南昌航空大学材料科学与工程学院 
周璇 南昌航空大学航空制造工程学院 
钟明君 南昌航空大学航空制造工程学院 
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