Dynamic Recrystallization of Ti-6Al-4V Alloy During Hot Compression

doi:10.11901/1005.3093.2020.569

Chinese Journal of Materials Research

2021, Vol. 35

Issue (8): 583-590 DOI: 10.11901/1005.3093.2020.569

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Dynamic Recrystallization of Ti-6Al-4V Alloy During Hot Compression

LIU Chao¹, WANG Xin¹, MEN Yue¹, ZHANG Haoyu¹, ZHANG Siqian¹, ZHOU Ge¹(

), CHEN Lijia¹, LIU Haijian²

^1.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
^2.Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China

Cite this article:

LIU Chao, WANG Xin, MEN Yue, ZHANG Haoyu, ZHANG Siqian, ZHOU Ge, CHEN Lijia, LIU Haijian. Dynamic Recrystallization of Ti-6Al-4V Alloy During Hot Compression. Chinese Journal of Materials Research, 2021, 35(8): 583-590.

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Abstract

The stress-strain curves of Ti-6Al-4V alloy during hot deformation by applied strain rate within the range of 5×10^-4~5×10^-2 s^-1 at 870~960°C were measured via single-pass isothermal compression test. The dynamics characteristics of rheological stress, critical strain capacity and structure evolution of the alloy during dynamic recrystallization were systematically illustrated by means of KM model, Poliak-Jonas model, and Avrami model. Then a concept of volume fraction of the microstructure transformation, i.e., the portion of the alloy that has been underwent microstructure transformation during dynamic recrystallization, was introduced into the so called prasad power dissipation rate model, thus the energy variation of the alloy during dynamic recrystallization was acquired. Further, taking both of the acquired energy variation and the observed microstructure evolution characteristics together into consideration, the dynamic recrystallization mechanism of Ti-6Al-4V alloy may be revealed. It follows that the critical strain capacity of Ti-6Al-4V during dynamic recrystallization decreased and the structural transformation volume fraction increased following the rise of deformation temperature or the decline of strain rate. The power dissipation rate upon complete dynamic recrystallization is larger than 0.34, and the forming mechanism is a dislocation-induced arcuation nucleation mechanism.

Key words: metallic materials Ti-6Al-4V dynamic recrystallization physical models hot compression deformation microstructure

Received: 28 December 2020

ZTFLH:

TG146.23

Fund: National Natural Science Foundation of China(51805335)

About author: ZHOU Ge, Tel: 18602408585, E-mail: zhouge@sut.edu.cn

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	Chao LIU
	Xin WANG
	Yue MEN
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	Haijian LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.569 OR https://www.cjmr.org/EN/Y2021/V35/I8/583

Fig.1 True stress-true strain curves of Ti-6Al-4V alloy (a) 870℃; (b) 900℃; (c) 930℃; (d) 960℃

Table 1 Parameters in constitutive equation of Ti-6Al-4V alloy

Fig.2 ??(lnθ)/??ε-ε curves of Ti-6Al-4V alloy at different strain rates

Table 2 Critical strain during high deformation of Ti-6Al-4V alloy

Fig.3 Relation of critical strain of Ti-6Al-4V alloy for dynamic recrystallization

Fig.4 Evolution of dynamic recrystallization volume fraction X_d in Ti-6Al-4V alloy under different conditions (a) strain rate 0.005 s^-1, (b) temperature 930℃

Fig.5 Dynamic recrystallization power dissipation of Ti-6Al-4V alloy at different temperatures and strain rates (a) ε=0.3, (b) ε=0.4

Fig.6 Microstructures of Ti-6Al-4V alloy (a) initial; (b) T=930℃, ?=0.0005 s^-1, ε=0.3; (c) T=930℃, ?=0.0005 s^-1, ε=0.4; (d) T=870℃, ?=0.0005 s^-1, ε=0.3; (e) T=870℃, ?=0.05 s^-1, ε=0.3; (f) T=960℃, ?=0.005 s^-1, ε=0.6

Fig.7 Microstructures of Ti-6Al-4V alloy (T=930℃, ?=0.0005 s^-1, ε=0.3)

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