Dynamic recrystallization and hot processing map of Ti-48Al-2Cr-2Nb alloy during the hot deformation

被引：80

作者：

Chen, Xiaofei ^{[1
]}

Tang, Bin ^{[1
,2
]}

Liu, Dong ^{[3
]}

Wei, Beibei ^{[1
]}

Zhu, Lei ^{[1
]}

Liu, Renci ^{[3
]}

Kou, Hongchao ^{[1
,2
]}

Li, Jinshan ^{[1
,2
]}

机构：

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

[2] Northwestern Polytech Univ, Chongqing Innovat Ctr, Chongqing 401135, Peoples R China

[3] Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2021年 / 179卷 / 179期

基金：

中国国家自然科学基金;

关键词：

TiAl alloy; Discontinuous dynamic recrystallization; (DDRX); Continuous dynamic recrystallization (CDRX); Hot processing map; GAMMA-TIAL ALLOY; Y) ALLOY; BEHAVIOR; MICROSTRUCTURE; PHASE; EVOLUTION; SOLIDIFICATION; TI-44AL-8NB-(W; MECHANISM; WORKING;

D O I：

10.1016/j.matchar.2021.111332

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Dynamic recrystallization (DRX) mechanism of Ti-48Al-2Cr-2Nb (at. %) alloy was investigated by thermal uniaxial compression experiments in this work. The deformed microstructure showed that in addition to the discontinuous dynamic recrystallization (DDRX) with the typical feature of grain nucleation and growth, continuous dynamic recrystallization (CDRX) charactered by the crystal orientation accumulation also appeared in gamma grains during the hot compression at 1200 degrees C/0.01 s-1. The crystal orientations of CDRX grains were nearly close to the (001) orientation at the strain of 0.92. Also, the emergence of DRX in the gamma laths of lamellar colonies was confirmed by microstructure characterization, and the alpha 2 -* gamma phase transformation occurred simultaneously. On the other hand, the GOS threshold value for distinguishing the deformed grains and DRX grains was analyzed to quantitatively calculate the DRX volume fractions. A novel hot processing map with the strain of 0.92 based on the DRX volume fraction was established to obtain the deformation parameters for the full DRX and provide the theoretical results for optimizing the thermo-mechanical treatment of TiAl alloy (approximately 1100 degrees C/0.001 s-1 and 1200 degrees C/0.01 s-1).

引用

页数：10

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