Forging of Aluminium Components under a Superimposed Hydrostatic Pressure to Induce Local Strain Hardening

authored by: Bernd Arno Behrens, Thomas Hagen, Andreas Klassen, Julian Knigge, Jens Mielke, Insa Pfeiffer
Abstract: A promising approach to handling low ductile aluminium alloys in a forming process is forming under superimposed hydrostatic pressure. The influence of superimposed hydrostatic pressure on the flow stress as well as on the formability for various hydrostatic pressures and temperatures was analysed [15, 3, and 7]. By increasing the formability of the workpiece, larger local plastic strains could be achieved. The results reveal highly increased formability at superimposed pressure of 85 MPa for workpieces from thermosetting alloy AlSi1MgMn (EN AW-6082) in comparison to those from self-hardening alloy AlMg4.5Mn0.7 (EN AW-5083). As a general tendency, the self-hardening alloys show a lower increase in formability when forged under superimposed pressure. But additionally, a charge-dependent influence of macro- and micro defects on the crack resistance was detected for alloy AlMg4.5Mn0.7. By evaluating damage models in finite element models the damage occurring in cold forming processes under superimposed hydrostatic pressure was predicted.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
Type: Conference contribution
Pages: 191-217
No. of pages: 27
Publication date: 19.10.2010
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Engineering
Electronic version(s): https://doi.org/10.4028/www.scientific.net/AMR.137.191 (Access: Open)
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{1cf6e22c747a496cb294923746ea9b3f,
title = "Forging of Aluminium Components under a Superimposed Hydrostatic Pressure to Induce Local Strain Hardening",
abstract = "A promising approach to handling low ductile aluminium alloys in a forming process is forming under superimposed hydrostatic pressure. The influence of superimposed hydrostatic pressure on the flow stress as well as on the formability for various hydrostatic pressures and temperatures was analysed [15, 3, and 7]. By increasing the formability of the workpiece, larger local plastic strains could be achieved. The results reveal highly increased formability at superimposed pressure of 85 MPa for workpieces from thermosetting alloy AlSi1MgMn (EN AW-6082) in comparison to those from self-hardening alloy AlMg4.5Mn0.7 (EN AW-5083). As a general tendency, the self-hardening alloys show a lower increase in formability when forged under superimposed pressure. But additionally, a charge-dependent influence of macro- and micro defects on the crack resistance was detected for alloy AlMg4.5Mn0.7. By evaluating damage models in finite element models the damage occurring in cold forming processes under superimposed hydrostatic pressure was predicted.",
keywords = "Active means, Cold forging, Damage prediction, Simulation, Strain hardening, Superimposed hydrostatic pressure",
author = "Behrens, {Bernd Arno} and Thomas Hagen and Andreas Klassen and Julian Knigge and Jens Mielke and Insa Pfeiffer",
year = "2010",
month = oct,
day = "19",
doi = "10.4028/www.scientific.net/AMR.137.191",
language = "English",
isbn = "9780878492343",
series = "Advanced Materials Research",
pages = "191--217",
editor = "Heinz Palkowski and Kai-Michael Rudolph",
booktitle = "Creation of High-Strength Structures and Joints by Setting up Local Material Properties (II)",
}