Dynamic Recrystallization Model of Ultrafine Grain Pure Titanium Prepared by Combined Deformation Process

doi:10.11901/1005.3093.2019.442

Chinese Journal of Materials Research

2020, Vol. 34

Issue (3): 217-224 DOI: 10.11901/1005.3093.2019.442

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Dynamic Recrystallization Model of Ultrafine Grain Pure Titanium Prepared by Combined Deformation Process

MA Weijie,YANG Xirong(

),LUO Lei,LIU Xiaoyan,HAO Fengfeng

School of Metallurgy and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

Cite this article:

MA Weijie,YANG Xirong,LUO Lei,LIU Xiaoyan,HAO Fengfeng. Dynamic Recrystallization Model of Ultrafine Grain Pure Titanium Prepared by Combined Deformation Process. Chinese Journal of Materials Research, 2020, 34(3): 217-224.

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Abstract

The combined deformation processing technology of equal channel angular pressing (ECAP) and rotary swaging at indoor temperatures was applied to industrial pure titanium. Then the deformation behavior of the acquired ultrafine grained pure titanium by applied strain rates of 0.01, 0.1 and 1 s^-1 at 200, 300, 350, 400 and 450°C was investigated via thermal compression test with the Gleeble 3800 thermal simulator. The results show that the dynamic recrystallization characteristics of the experimental true stress-strain curve are significant, and the apparent single peak stress appears. According to the Arrhenius constitutive equation based on the peak stress value of the acquired ultrafine grained pure titanium, the peak stress can effectively be predicted with an average relative error of only 4.44%. Since the large plastic deformed sample was subjected to pre-heat insulation treatment before thermal compression, the critical strain for dynamic recrystallization was increased, of which the material constant is 0.8329. The dynamic recrystallization behavior during deformation mainly occurs in the stage where the strain is greater than 0.1 and less than 0.4. Whereas the strain is greater than 0.4, the material undergoes secondary hardening.

Key words: synthesizing and processing technics for materials constitutive model hot compression ultrafine grain pure titanium

Received: 11 September 2019

ZTFLH:

TG146.2+3

Fund: National Natural Science Foundation of China(51474170)

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	Weijie MA
	Xirong YANG
	Lei LUO
	Xiaoyan LIU
	Fengfeng HAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.442 OR https://www.cjmr.org/EN/Y2020/V34/I3/217

Fig.1 Microstructure of coarse grain Ti (OM) (a) and ultrafine grain Ti (TEM) (b)

Fig.2 True stress vs true strain curves after compression deformation of UFG Ti (a)

ε ˙

=0.01 s^-1, T=200、300、350、400 and 450℃； (b)

ε ˙

=0.01、0.1 and 1 s^-1, T=300℃

Fig.3 The pole figures of compressed specimen under different conditions (a) UFG sample and at the same strain rate of 0.01 s^-1; (b) room temperature ; (c) 300℃

Fig.4 TEM image of UFG Ti after compression at 300℃ and 0.01 s^-1

Fig.5 Relationship between flow stress and thermal deformation parameters of UFG Tiln[sinh(ασ)] vs 1000/T (a) and lnZvs ln[sinh(ασ)] (b)

Table 1 Material constants for Arrhenius constitutive model

Fig.6 Scatter map of the caculated stress vs measured stress

Fig.7 Schematic of the work-hardening rate vs flow stress

Fig.8 Work hardening rate vs flow stress curves at 300℃ and 0.01 s^-1

Fig.9

d θ / d σ

vs true stress curves at 300℃ and 0.01 s^-1

Fig.10 Linear fit of

ε c

ε p

Fig.11 X_DRXvs true strain curves

Fig.12 Linear fit of dynamic recrystallization material constants

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