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

Xiaofei Chen; Bin Tang; Yan Liu; Xiangyi Xue; Lei Li; Hongchao Kou; Jinshan Li

doi:10.1016/j.pnsc.2019.08.004

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

Xiaofei Chen
, Bin Tang
, Yan Liu
, Xiangyi Xue
, Lei Li
, Hongchao Kou
, Jinshan Li

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

34 Scopus citations

Abstract

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 °C to 1200 °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, it's concluded that 1200 °C/0.01s⁻¹ is the optimization parameter. Besides, both DDRX and CDRX were observed in the γ phase evolution. The deformation mechanism from the inter-grain dislocation motion to the grain boundary migration and grain rotation was discussed.

Original language	English
Pages (from-to)	587-594
Number of pages	8
Journal	Progress in Natural Science: Materials International
Volume	29
Issue number	5
DOIs	https://doi.org/10.1016/j.pnsc.2019.08.004
State	Published - Oct 2019

Keywords

Constitutive equation
Dynamic recrystallization
Microstructure
TiAl alloys

Access to Document

10.1016/j.pnsc.2019.08.004

Cite this

@article{85aa59daa0d44b0eb56afcf9fd861db6,

title = "Dynamic recrystallization behavior of the Ti–48Al–2Cr–2Nb alloy during isothermal hot deformation",

abstract = "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 °C to 1200 °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, it's concluded that 1200 °C/0.01s−1 is the optimization parameter. Besides, both DDRX and CDRX were observed in the γ phase evolution. The deformation mechanism from the inter-grain dislocation motion to the grain boundary migration and grain rotation was discussed.",

keywords = "Constitutive equation, Dynamic recrystallization, Microstructure, TiAl alloys",

author = "Xiaofei Chen and Bin Tang and Yan Liu and Xiangyi Xue and Lei Li and Hongchao Kou and Jinshan Li",

note = "Publisher Copyright: {\textcopyright} 2019 Chinese Materials Research Society",

year = "2019",

month = oct,

doi = "10.1016/j.pnsc.2019.08.004",

language = "英语",

volume = "29",

pages = "587--594",

journal = "Progress in Natural Science: Materials International",

issn = "1002-0071",

publisher = "Elsevier B.V.",

number = "5",

}

TY - JOUR

T1 - Dynamic recrystallization behavior of the Ti–48Al–2Cr–2Nb alloy during isothermal hot deformation

AU - Chen, Xiaofei

AU - Tang, Bin

AU - Liu, Yan

AU - Xue, Xiangyi

AU - Li, Lei

AU - Kou, Hongchao

AU - Li, Jinshan

PY - 2019/10

Y1 - 2019/10

N2 - 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 °C to 1200 °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, it's concluded that 1200 °C/0.01s−1 is the optimization parameter. Besides, both DDRX and CDRX were observed in the γ phase evolution. The deformation mechanism from the inter-grain dislocation motion to the grain boundary migration and grain rotation was discussed.

AB - 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 °C to 1200 °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, it's concluded that 1200 °C/0.01s−1 is the optimization parameter. Besides, both DDRX and CDRX were observed in the γ phase evolution. The deformation mechanism from the inter-grain dislocation motion to the grain boundary migration and grain rotation was discussed.

KW - Constitutive equation

KW - Dynamic recrystallization

KW - Microstructure

KW - TiAl alloys

UR - https://www.scopus.com/pages/publications/85072765887

U2 - 10.1016/j.pnsc.2019.08.004

DO - 10.1016/j.pnsc.2019.08.004

M3 - 文章

AN - SCOPUS:85072765887

SN - 1002-0071

VL - 29

SP - 587

EP - 594

JO - Progress in Natural Science: Materials International

JF - Progress in Natural Science: Materials International

IS - 5

ER -

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

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this