摘要
为了分析TA7钛合金的热变形工艺参数,通过高温压缩试验对TA7钛合金的高温变形行为进行了研究。试验温度为1123~1273K,应变速率为0.001~1 s^(-1)。此外,提出了一种修正并联本构模型用来分析应变速率、变形温度及应变对流动应力的影响。然后,基于动态模型,建立了TA7钛合金的热加工图,并通过微观组织分析对加工图的准确性进行了验证。结果表明,TA7钛合金合理的工艺参数为变形温度1223 K,应变速率0.001 s^(-1),而其非稳态区域位于低温高应变速率区。
Isothermal compression tests in the temperature range of 1123-1273 K and the strain rate range of 0.001-1 s1 were conducted to analyze the elevated temperature deformation behavior of TA7 titanium alloy for the purpose of acquiring optimum processing parameters. Besides, a modified parallel constitutive model was put forward to illustrate the high temperature flow stress as a function of the strain rate, deformation temperature and true strain. Thereafter, the processing map which was on the basis of dynamic materials model was established. The investigation was made from the microstructure of compressed TA7 titanium alloy specimens to validate processing map. According to the results, the deformation temperature of 1223 K and strain rate of 0.001 s-1 are the best processing parameters for the TA7 alloy. In addition, the instability regions are in a relatively lower temperature-higher strain rate region.
作者
杨晓康
王快社
史佳敏
王萌
蔡军
王庆娟
刘莹莹
Yang Xiaokang;Wang Kuaishe;Shi Jiamin;Wang Meng;Cai Jun;Wang Qingjuan;Liu Yingying(Shaanxi Engineering Research Center of Metallurgical,Xi＇an University of Architecture and Technology,Xi＇an 710055,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第8期2341-2346,共6页
Rare Metal Materials and Engineering
基金
Industrial Science and Technique Key Project of Shaanxi Province(2016GY-207)
Innovation Foundation of Western Materials(XBCL-3-19)
Pre-research Foundation of Jinchuan Company-Xi’an University of Architecture and Technology(YY1501)
Project of International Cooperation and Exchange of Shaanxi Provincial(2016 KW-054)
关键词
TA7钛合金
高温变形行为
本构方程
加工图
TA7 titanium alloy
elevated temperature deformation behavior
constitutive equation
processing map
