Kinematics of metal flow during twist extrusion investigated with a new experimental method

Y. Beygelzimer, A. Reshetov, S. Synkov, O. Prokof'eva, R. Kulagin

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

We propose an experimental method for investigating the kinematics of metal flow in twist extrusion (TE). The method is based on a theoretical model of the velocity field. The parameters of this model are determined to satisfy the observed flow-line for characteristic points of the specimen. The model incorporates two physical constraints: (1) metal flow is limited by the surface of the die; (2) metal volume remains constant. The advantage of this method is that it takes into account the actual rheology of the metal and friction conditions. We show that TE forms a vortex-like flow that stretches metal particles. The stretching increases with subsequent TE passes. The equivalent strain increases from 0.3 to 0.5 in the paraxial zone of the specimen to 2.0-2.5 at the periphery. We analyze different sources of inaccuracy of the method and show that its error in estimating the equivalent strain is of the order of 0.1, which is perfectly acceptable when investigating severe plastic deformations.

LanguageEnglish
Pages3650-3656
Number of pages7
JournalJournal of Materials Processing Technology
Volume209
Issue number7
DOIs
Publication statusPublished - 1 Apr 2009
Externally publishedYes

Fingerprint

Extrusion
Twist
Kinematics
Metals
Rheology
Plastic Deformation
Stretch
Theoretical Model
Velocity Field
Stretching
Vortex
Plastic deformation
Friction
Vortex flow
Die
Line
Model

Keywords

  • experimentally kinematic method
  • strain distribution
  • twist extrusion

Cite this

Beygelzimer, Y. ; Reshetov, A. ; Synkov, S. ; Prokof'eva, O. ; Kulagin, R. / Kinematics of metal flow during twist extrusion investigated with a new experimental method. In: Journal of Materials Processing Technology. 2009 ; Vol. 209, No. 7. pp. 3650-3656.
@article{3e1526659b6645b8a10ccd0f267940c0,
title = "Kinematics of metal flow during twist extrusion investigated with a new experimental method",
abstract = "We propose an experimental method for investigating the kinematics of metal flow in twist extrusion (TE). The method is based on a theoretical model of the velocity field. The parameters of this model are determined to satisfy the observed flow-line for characteristic points of the specimen. The model incorporates two physical constraints: (1) metal flow is limited by the surface of the die; (2) metal volume remains constant. The advantage of this method is that it takes into account the actual rheology of the metal and friction conditions. We show that TE forms a vortex-like flow that stretches metal particles. The stretching increases with subsequent TE passes. The equivalent strain increases from 0.3 to 0.5 in the paraxial zone of the specimen to 2.0-2.5 at the periphery. We analyze different sources of inaccuracy of the method and show that its error in estimating the equivalent strain is of the order of 0.1, which is perfectly acceptable when investigating severe plastic deformations.",
keywords = "experimentally kinematic method, strain distribution, twist extrusion",
author = "Y. Beygelzimer and A. Reshetov and S. Synkov and O. Prokof'eva and R. Kulagin",
year = "2009",
month = "4",
day = "1",
doi = "10.1016/j.jmatprotec.2008.08.022",
language = "English",
volume = "209",
pages = "3650--3656",
journal = "Journal of Materials Processing Technology",
issn = "0924-0136",
number = "7",

}

Kinematics of metal flow during twist extrusion investigated with a new experimental method. / Beygelzimer, Y.; Reshetov, A.; Synkov, S.; Prokof'eva, O.; Kulagin, R.

In: Journal of Materials Processing Technology, Vol. 209, No. 7, 01.04.2009, p. 3650-3656.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Kinematics of metal flow during twist extrusion investigated with a new experimental method

AU - Beygelzimer, Y.

AU - Reshetov, A.

AU - Synkov, S.

AU - Prokof'eva, O.

AU - Kulagin, R.

PY - 2009/4/1

Y1 - 2009/4/1

N2 - We propose an experimental method for investigating the kinematics of metal flow in twist extrusion (TE). The method is based on a theoretical model of the velocity field. The parameters of this model are determined to satisfy the observed flow-line for characteristic points of the specimen. The model incorporates two physical constraints: (1) metal flow is limited by the surface of the die; (2) metal volume remains constant. The advantage of this method is that it takes into account the actual rheology of the metal and friction conditions. We show that TE forms a vortex-like flow that stretches metal particles. The stretching increases with subsequent TE passes. The equivalent strain increases from 0.3 to 0.5 in the paraxial zone of the specimen to 2.0-2.5 at the periphery. We analyze different sources of inaccuracy of the method and show that its error in estimating the equivalent strain is of the order of 0.1, which is perfectly acceptable when investigating severe plastic deformations.

AB - We propose an experimental method for investigating the kinematics of metal flow in twist extrusion (TE). The method is based on a theoretical model of the velocity field. The parameters of this model are determined to satisfy the observed flow-line for characteristic points of the specimen. The model incorporates two physical constraints: (1) metal flow is limited by the surface of the die; (2) metal volume remains constant. The advantage of this method is that it takes into account the actual rheology of the metal and friction conditions. We show that TE forms a vortex-like flow that stretches metal particles. The stretching increases with subsequent TE passes. The equivalent strain increases from 0.3 to 0.5 in the paraxial zone of the specimen to 2.0-2.5 at the periphery. We analyze different sources of inaccuracy of the method and show that its error in estimating the equivalent strain is of the order of 0.1, which is perfectly acceptable when investigating severe plastic deformations.

KW - experimentally kinematic method

KW - strain distribution

KW - twist extrusion

UR - http://www.scopus.com/inward/record.url?scp=62949099258&partnerID=8YFLogxK

UR - http://www.sciencedirect.com/science/article/pii/S0924013608006535

U2 - 10.1016/j.jmatprotec.2008.08.022

DO - 10.1016/j.jmatprotec.2008.08.022

M3 - Article

VL - 209

SP - 3650

EP - 3656

JO - Journal of Materials Processing Technology

T2 - Journal of Materials Processing Technology

JF - Journal of Materials Processing Technology

SN - 0924-0136

IS - 7

ER -