High Temperature Forming of Ti-6Al-4V Alloy Considering Microstructural Evolution

Lee, You Hwan; Lee, Chong Soo; Shin, Tae Jin; Hwang, S.M.; Shim, In Ok

doi:10.4028/www.scientific.net/kem.274-276.117

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…The microstructure prediction model reflecting microstructure evolution during heating and high temperature deformation is established in this work. To predict the volume fraction and grain size of primary α phase, the geometrical model for grain size change of α phase developed in previous work [2,9,10] was used. Assuming that the total numbers of α grains and β grain size are constant, the grain size of α phase (d) can be calculated by following equation:…”

Section: Resultsmentioning

confidence: 99%

Prediction of Microstructure Evolution in Hot Backward Extrusion of Ti-6Al-4V Alloy

Yeom

Kim

Hong

et al. 2012

Journal of Metallurgy

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Microstructure evolution of Ti-6Al-4V alloy during hot backward extrusion process was simulated with the combined approaches of finite element method (FEM) and microstructure prediction model. From experimental analysis, it can be found that the change of microstructure during hot forming process of titanium alloy has a close relation to α/β phase transformation and grain growth behaviour. A microstructure prediction model was established by considering the change of volume fractions and grain size of both phases varying with process variables and then implemented into the user-defined subroutine of FEM analysis. In order to demonstrate the reliability of the model, the volume fraction and grain size of primary α phase during the hot backward extrusion process of Ti-6Al-4V alloy were simulated. The simulation results were compared with the experimental ones.

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Section: Resultsmentioning

confidence: 99%

Prediction of Microstructure Evolution in Hot Backward Extrusion of Ti-6Al-4V Alloy

Yeom

Kim

Hong

et al. 2012

Journal of Metallurgy

Self Cite

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“…Hitherto there has been little research work which deals with the effect of process parameters on the microstructure and mechanical properties of Ti-6Al-4V alloy consolidated from powders, particularly by powder forging. In the current practice, powder forging includes pre-forming operations such as powder compacting followed by HIP or vacuum sintering prior to the actual forging [5][6][7]. In this study, a more time-effective and economical way of heating and pre-sintering has been studied.…”

Section: Introductionmentioning

confidence: 99%

Tensile Properties of Ti-6Al-4V Discs Produced by Open Die Powder Compact Forging of Pre-Alloyed HDH Powders

Raynova

Zhang

Gabbitas

2012

KEM

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Open die powder compact forging was employed for consolidation of Ti-6Al-4V(wt.%) powders which were produced by a hydride-dehydride (HDH) process. The powders were initially warm-compacted into cylindrical shapes. Induction heating was used for preheating the compacts prior to forging into plates. The effect of the forging parameters such as temperature and pre-sintering time on the microstructure and tensile properties of the forged plates were studied. Porosity and the alpha-beta phase distribution were investigated to enable a better understanding of their effect on the fracture behaviour of the tensile tested specimens. The fracture surfaces of the broken tensile specimens were analysed using Scanning Electron Microscopy (SEM) to find the correlation between microstructure, residual porosity and fracture behaviour. A combination of high ultimate tensile strength of over 1200MPa and a good ductility reflected by an elongation to fracture of around 10% was achieved in some of the forged discs.

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FE Analysis of Microstructure Evolution during Ring Rolling Process of a Large-Scale Ti-6Al-4V Alloy Ring

Yeom

Kim

Hong

et al. 2010

MSF

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Microstructure evolution during ring rolling process of a large-scale Ti-6Al-4V ring was investigated with the combined approaches of three dimensional finite element method (FEM) simulation and microstructure prediction model. A microstructure prediction model was established by considering the volume fractions and grain size of  and  phases varying with process variables, and grain growth. In order to perform FE simulation for ring rolling process of Ti-6Al-4V alloy, a constitutive equation was generated by utilizing the flow stress data obtained from hot compression tests at different temperature and strain rate conditions. The volume fraction and grain size of  and  phases during ring rolling were calculated by de-coupled approach between FEM analysis and microstructure prediction model. The prediction results were compared with the experimental ones. Our proposed microstructure simulation module was useful for designing hot forming process of Ti-6Al-4V alloy

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High Temperature Forming of Ti-6Al-4V Alloy Considering Microstructural Evolution

Cited by 3 publications

References 14 publications

Prediction of Microstructure Evolution in Hot Backward Extrusion of Ti-6Al-4V Alloy

Prediction of Microstructure Evolution in Hot Backward Extrusion of Ti-6Al-4V Alloy

Tensile Properties of Ti-6Al-4V Discs Produced by Open Die Powder Compact Forging of Pre-Alloyed HDH Powders

FE Analysis of Microstructure Evolution during Ring Rolling Process of a Large-Scale Ti-6Al-4V Alloy Ring

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