Unified constitutive modelling for two-phase lamellar titanium alloys at hot forming conditions

被引：6

作者：

Yang, Lei ^{[1
]}

Li, Nan ^{[2
]}

Wang, Baoyu ^{[1
]}

Lin, Jianguo ^{[1
,2
]}

Zhao, Huijun ^{[1
]}

Ma, Wenyu ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Sch Mech Engn, Beijing 100083, Peoples R China

[2] Imperial Coll London, Dept Mech Engn, London SW7 2AZ, England

来源：

MANUFACTURING REVIEW | 2016年 / 3卷

关键词：

Hot forming; Unified viscoplastic constitutive equations; Lamellar microstructure; Softening mechanism; Two-phase titanium alloys; Globularization;

D O I：

10.1051/mfreview/2016016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, a set of mechanism based unified viscoplastic constitutive equations have been established for two-phase titanium alloys with initial lamellar microstructure, which models the softening mechanisms of the alloys in hot forming conditions. The dislocation density, rotation and globularization of lamellar a-phase and their effects on flow behaviour can also be modelled. The values of material constants in the equation set have been calibrated, according to stress-strain curves and globularization fractions of lamellar a-phase obtained from compression tests at a range of temperatures and strain rates, using a genetic algorithm (GA) based optimisation method. Based on the determined constitutive equations, flow stress and globularization evolution of Ti-17 and TA15 alloys at different temperatures and strain rates were predicted. Good agreements between the experimental and computed results were obtained.

引用

页数：10

共 45 条

[1] Dislocation density based model for plastic deformation and globularization of Ti-6Al-4V [J].

Babu, Bijish ;

Lindgren, Lars-Erik .

INTERNATIONAL JOURNAL OF PLASTICITY, 2013, 50 :94-108

[2] Modelling of dominant softening mechanisms for Ti-6Al-4V in steady state hot forming conditions [J].

Bai, Q. ;

Lin, J. ;

Dean, T. A. ;

Balint, D. S. ;

Gao, T. ;

Zhang, Z. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2013, 559 :352-358

[3] An overview on the use of titanium in the aerospace industry [J].

Boyer, RR .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1996, 213 (1-2) :103-114

[4] Constitutive equations for elevated temperature flow stress of Ti-6Al-4V alloy considering the effect of strain [J].

Cai, Jun ;

Li, Fuguo ;

Liu, Taiying ;

Chen, Bo ;

He, Min .

MATERIALS & DESIGN, 2011, 32 (03) :1144-1151

[5] A study on formulation of objective functions for determining material models [J].

Cao, J. ;

Lin, J. .

INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, 2008, 50 (02) :193-204

[6] An implicit unitless error and step-size control method in integrating unified viscoplastic/creep ODE-type constitutive equations [J].

Cao, J. ;

Lin, J. ;

Dean, T. A. .

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, 2008, 73 (08) :1094-1112

[7] Prediction of microstructural evolution during hot forging [J].

Chen, Fei ;

Cui, Zhenshan ;

Chen, Jun .

MANUFACTURING REVIEW, 2014, 1

[8] Modelling the effects of grain-size gradients on necking in superplastic forming [J].

Cheong, BH ;

Lin, J ;

Ball, AA .

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2003, 134 (01) :10-18

[9] An efficient genetic algorithm for a hybrid flow shop scheduling problem with time lags and sequence- dependent setup time [J].

Farahmand-Mehr, Mohammad ;

Fattahi, Parviz ;

Kazemi, Mohammad ;

Zarei, Hassan ;

Piri, Ali .

MANUFACTURING REVIEW, 2014, 1

[10] Unified modeling of flow softening and globularization for hot working of two-phase titanium alloy with a lamellar colony microstructure [J].

Gao, Pengfei ;

Yang, He ;

Fan, Xiaoguang ;

Zhu, Shuai .

JOURNAL OF ALLOYS AND COMPOUNDS, 2014, 600 :78-83

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