Paper Title:
The Positive Role of Back-Pressure in Equal Channel Angular Extrusion
  Abstract

Equal Channel Angular Extrusion (ECAE) has become a very popular tool for studying the evolution of microstructure and properties under severe plastic deformation. It is believed that the stress-strain characteristics are uniform in a cross-section of the billet and this uniformity of the stress-strain distribution ensures the uniformity of microstructure and mechanical properties in ECAE processed billet. However, some experimental data such as the fracture of the extruded billet, which is initiated at the inner surface of the sample, has caused doubts about uniformity of stress-strain distribution. This non-uniformity has been proved recently by Finite Element Simulation. In this paper the studies of the positive role of the applied back-pressure during ECAE are reviewed and the influence of a back-pressure on the uniformity of the stress-strain distribution, strain localisation, die corner filing, and the prevention of fracture is shown. The effect of back-pressure on grain refinement and improvement in mechanical properties is emphasized. The paper summarises our results from over seven years of work using a unique machine for ECAE with computer-controlled back-pressure and velocity of the backward punch.

  Info
Periodical
Materials Science Forum (Volumes 503-504)
Edited by
Zenji Horita
Pages
37-44
DOI
10.4028/www.scientific.net/MSF.503-504.37
Citation
R. Lapovok, "The Positive Role of Back-Pressure in Equal Channel Angular Extrusion", Materials Science Forum, Vols. 503-504, pp. 37-44, 2006
Online since
January 2006
Authors
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Zhi Jian Zhang, Joong Kuen Park
Chapter 7: Common Aspects of Manufacturing
Abstract:The Cockcroft-Latham (CL) damage factor has been calculated, using FEM simulation, during equal channel angular extrusion (ECAE) of strain...
2283
Authors: Qing Zhou, Wen Jie Chen, Jun Xu, Yu Peng Duan
Chapter 17: Mechanical Behavior and Fracture
Abstract:Improving the efficiency of equal-channel angular pressing (ECAP) necessitates predicting the location of fracture and the number of ECAP...
2373
Authors: Mônica Paula Ribeiro, Marcio Ferreira Hupalo, Selauco Vurobi, Osvaldo Mitsuyuki Cintho
Chapter 3: Properties
Abstract:The main aim of this work is to show porosity evolution during application of various processing conditions to a high-purity (99.7 wt.%) iron...
404