Effect of initial microstructure on plastic flow behaviour during isothermal forging of Ti-10V-2Fe-3Al

被引：112

作者：

Jackson, M. ^{[1
]}

Jones, N. G. ^{[2
]}

Dye, D. ^{[2
]}

Dashwood, R. J. ^{[3
]}

机构：

[1] Univ Sheffield, Dept Mat Engn, Sheffield S1 3JD, S Yorkshire, England

[2] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2AZ, England

[3] Univ Warwick, Warwick Mfg Grp, Coventry CV4 7AL, W Midlands, England

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 501卷 / 1-2期

基金：

英国工程与自然科学研究理事会;

关键词：

Isothermal forging; Flow softening; Ti-10V-2Fe-3Al; Strain rate sensitivity; Microstructural evolution; Deformation mechanisms; ALLOY TI-10V-2FE-3AL; HOT-WORKING; TI-6AL-4V;

D O I：

10.1016/j.msea.2008.09.071

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The plastic flow behaviour and microstructural development during isothermal forging was determined for near beta alloy Ti-10V-2Fe-3Al. Two different initial microstructures were employed: (i) a beta forged billet with a large prior beta grain size with Widmanstatten alpha platelets; and (ii) an alpha-beta forged billet with prior globular primary alpha. The beta forged condition exhibited a peak stress followed by intense flow softening, which is attributed to the break up of the Widmanstatten alpha platelets. Evidence suggests that peak hardening at low strains is due to dislocation pile-ups at alpha platelet/subgrain beta interfaces and subsequent flow softening is attributed to the transmission of beta phase through the alpha platelets. A strain rate 'jump' test investigation provided sufficient evidence to suggest that there is a transition from dislocation dominant deformation mechanisms at high strains rates to diffusional dominant deformation at low strain rates in Ti-10V-2Fe-3Al during forging. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：248 / 254

页数：7

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