铸态TC17钛合金流动应力预测  

Flow Stress Prediction for As-cast TC17 Titanium Alloy

作　　者：杨晓康 王快社[1,3] 张志娟 郭敏[1,3] 蔡军 杨清相[1,3] Yang Xiaokang;Wang Kuaishe;Zhang Zhijuan;Guo Min;Cai Jun;Yang Qingxiang(Xi'an University of Architecture and Technology,Xi'an 710055,China;Xi'an Sai'Te Simai Titanium Industry Co.Ltd,Xi'an 710201,China;National and Local Joint Research Center for Functional Materials Processing,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学,陕西西安710055 [2]西安赛特思迈钛业有限公司,陕西西安710201 [3]功能材料加工国家地方联合工程研究中心,陕西西安710055

出　　处：《稀有金属材料与工程》2020年第4期1131-1139,共9页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51574192,U1360105);Key Research and Development Program of Shaanxi(2017ZDXM-GY-036)。

摘　　要：通过热模拟压缩试验对铸态TC17钛合金的高温变形行为进行了研究。温度范围1073~1373 K,应变速率范围0.01~20 s^-1。建立了4种本构模型,分别是应变补偿双曲正弦模型、修正Arrhenius模型、Johnson Cook模型和修正Johnson Cook模型,用来表征铸态TC17钛合金的高温流动应力。采用相关系数、平均相对误差和相对误差统计分析了4种模型的准确性。结果表明:JohnsonCook模型不能用来描述铸态TC17钛合金高温流动应力;在α+β两相区,应变补偿双曲正弦模型精度最高,而在β单相区修正Johnson Cook模型更为准确;在整个变形温度范围内,应变补偿双曲正弦模型比其他几种模型的准确性更高。The hot deformation behavior of as-cast TC17 titanium alloy was investigated by isothermal hot compression tests at temperatures of 1073~1373 K and strain rates of 0.01~20 s^-1.The four constitutive models,strain compensated Arrhenius-type(SCA),modified Arrhenius-type(MA),Johnson Cook(JC)and modified Johnson Cook(MJC),were used to represent the elevated temperature flow behavior of as-cast TC17 titanium alloy.The suitability levels of these models were evaluated by comparing the correlation coefficient R,average absolute relative error(AARE),and relative error.The results indicate that the JC model is inadequate to predict the flow stress of as-cast TC17 titanium alloy;the SCA model has the highest accuracy to descript of flow behavior of TC17 alloy in theα+βtwo-phase region in the studied range.While the MJC model exhibits the highest accuracy in theβsingle-phase region.Within the whole deformation temperature range,the SCA model proposed in this paper can more accurately conform to the high-temperature rheological curve of as-cast TC17 titanium alloy.

关 键 词：铸态TC17钛合金 本构模型 流动应力 

分 类 号：TG146.23[一般工业技术—材料科学与工程]