Dynamic recrystallization behavior of the Ti-48Al-2Cr-2Nb alloy during isothermal hot deformation

被引：28

作者：

Chen, Xiaofei ^{[1
]}

Tang, Bin ^{[1
,2
]}

Liu, Yan ^{[1
]}

Xue, Xiangyi ^{[1
]}

Li, Lei ^{[3
]}

Kou, Hongchao ^{[1
]}

Li, Jinshan ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China

[2] Northwestern Polytech Univ, Shaanxi Key Lab High Performance Precis Forming T, Xian 710072, Shaanxi, Peoples R China

[3] Northwest Inst Nonferrous Met Res, Xian 710016, Shaanxi, Peoples R China

来源：

PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL | 2019年 / 29卷 / 05期

基金：

中国国家自然科学基金;

关键词：

TiAl alloys; Constitutive equation; Dynamic recrystallization; Microstructure; HIGH-TEMPERATURE DEFORMATION; TIAL ALLOY; HIGH NB; MICROSTRUCTURE; FATIGUE;

D O I：

10.1016/j.pnsc.2019.08.004

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The hot deformation behavior of the as-cast Ti-48Al-2Cr-2Nb alloy was investigated by isothermal compression tests at deformation temperatures ranging from 1000 degrees C to 1200 degrees C, and strain rates from 0.001 s(-1) to 0.1 s(-1). The single peak stress features common to all flow curves indicate that DRX is the dominating softening mechanism. The calculated values of the hot deformation activation energy Q and stress index n are 296.5 kJ mol(-1) and 3.97, respectively. Based on this, the Arrhenius type constitutive equation was successfully established. The DRX critical condition model and relationship among DRX volume fractions, deformation temperatures and strain rates were obtained to optimize the process. Combined with microstructure analysis, ifs concluded that 1200 degrees C/0.01s(-1) is the optimization parameter. Besides, both DDRX and CDRX were observed in the gamma phase evolution. The deformation mechanism from the inter-grain dislocation motion to the grain boundary migration and grain rotation was discussed.

引用

页码：587 / 594

页数：8

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