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万志鹏,孙宇,胡连喜,于欢.TiAl基合金动态再结晶临界模型建立[J].稀有金属材料与工程(英文),2018,47(3):835~839.[Wan Zhi-peng,Sun Yu,Hu Lian-xi and Yu Huan.Modeling of the critical conditions on dynamic recrystallization for TiAl-based alloy[J].Rare Metal Materials and Engineering,2018,47(3):835~839.]
Modeling of the critical conditions on dynamic recrystallization for TiAl-based alloy
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Received:January 25, 2016  Revised:March 14, 2016
Key words: Ti-47Al-2Nb-2Cr alloy  dynamic recrystallization  critical strain  Z parameter.
Foundation item:国家自然科学基金(51405110),中国博士后科学基金(2014M551234),高等学校博士学科点专项科研基金(20132302120002),黑龙江省博士后基金(LBH-Z14096)。
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Wan Zhi-peng,Sun Yu,Hu Lian-xi and Yu Huan  
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      The flow stress behavior of powder metallurgy (PM) Ti-47Al-2Nb-2Cr alloy during hot deformation was investigated at temperature of 950-1150oC and strain rates of 0.001-0.1s-1. In this paper, the influence of deformation parameters on the critical conditions of the dynamic recrystallization behavior was studied systematically. Based on the analysis of flow stress curves under different hot processing parameters, the critical strain (εc) and critical stress (σc) were obtained with the help of the critical condition theory proposed by Poliak and Jonas. It is also shown that the critical condition model was established by employing the strain rate and temperature compensation factor (Z): εc=1.2×10-3Z0.147. The occurrence of dynamic recrystallization behavior will be promoted with the increase of deformation temperature and the decrease of strain rate. Moreover, the reliability of the established model was verified by the observation of deformed microstructure.