Co-Extrusion of Semi-Finished Aluminium-Steel Compounds

authored by: S. E. Thürer, J. Uhe, O. Golovko, C. Bonk, A. Bouguecha, C. Klose, B. A. Behrens, H. J. Maier
Abstract: The combination of light metals and steels allows for new lightweight components with wear-resistant functional surfaces. Within the Collaborative Research Centre 1153 novel process chains are developed for the manufacture of such hybrid components. Here, the production process of a hybrid bearing bushing made of the aluminium alloy EN AW-6082 and the case-hardened steel 20MnCr5 is developed. Hybrid semi-finished products are an attractive alternative to conventional ones resulting from massive forming processes where the individual components are joined after the forming process. The actual hybrid semi-finished products were manufactured using a lateral angular co-extrusion (LACE) process. The bearing bushings are subsequently produced by die forging. In the present study, a tool concept for the LACE process is described, which renders the continuous joining of a steel rod with an aluminium tube possible. During the LACE process, the rod is fed into the extrusion die at an angle of approx. 90°. Metallographic analysis of the hybrid profile showed that the mechanical bonding between the different materials begins about 75 mm after the edge of the aluminium sheath. In order to improve the bonding strength, the steel rod is to be preheated during extrusion. Systematic investigations using a dilatometer, considering the maximum possible co-extrusion process parameters, were carried out. The variable parameters for the dilatometer experiments were determined by numerical simulation. In order to form a bond between the materials, the oxide layer needs to be disrupted during the co-extrusion process. In an attempt to better understand this effect, a modified sample geometry with chamfered steel was developed for the dilatometer experiments. The influence of the process parameters on the formation of the intermetallic phase at the interface was analysed by scanning electron microscopy and X-ray diffraction.
Organisation(s): Institute of Materials Science
Institute of Metal Forming and Metal Forming Machines
Type: Conference contribution
Publication date: 16.10.2017
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Physics and Astronomy
Electronic version(s): https://doi.org/10.1063/1.5008158 (Access: Closed)
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{40d9baafb08840f7b5ade372b902c886,
title = "Co-Extrusion of Semi-Finished Aluminium-Steel Compounds",
abstract = "The combination of light metals and steels allows for new lightweight components with wear-resistant functional surfaces. Within the Collaborative Research Centre 1153 novel process chains are developed for the manufacture of such hybrid components. Here, the production process of a hybrid bearing bushing made of the aluminium alloy EN AW-6082 and the case-hardened steel 20MnCr5 is developed. Hybrid semi-finished products are an attractive alternative to conventional ones resulting from massive forming processes where the individual components are joined after the forming process. The actual hybrid semi-finished products were manufactured using a lateral angular co-extrusion (LACE) process. The bearing bushings are subsequently produced by die forging. In the present study, a tool concept for the LACE process is described, which renders the continuous joining of a steel rod with an aluminium tube possible. During the LACE process, the rod is fed into the extrusion die at an angle of approx. 90°. Metallographic analysis of the hybrid profile showed that the mechanical bonding between the different materials begins about 75 mm after the edge of the aluminium sheath. In order to improve the bonding strength, the steel rod is to be preheated during extrusion. Systematic investigations using a dilatometer, considering the maximum possible co-extrusion process parameters, were carried out. The variable parameters for the dilatometer experiments were determined by numerical simulation. In order to form a bond between the materials, the oxide layer needs to be disrupted during the co-extrusion process. In an attempt to better understand this effect, a modified sample geometry with chamfered steel was developed for the dilatometer experiments. The influence of the process parameters on the formation of the intermetallic phase at the interface was analysed by scanning electron microscopy and X-ray diffraction.",
author = "Th{\"u}rer, {S. E.} and J. Uhe and O. Golovko and C. Bonk and A. Bouguecha and C. Klose and Behrens, {B. A.} and Maier, {H. J.}",
note = "Funding information: The results presented in this paper were obtained within the subproject A1 “Influence of local microstructure on the formability of extruded composite profiles” of the Collaborative Research Centre 1153 {\textquoteleft}{\textquoteleft}Process chain to produce hybrid high performance components by Tailored Forming{\textquoteright}{\textquoteright}. The authors thank the German Research Foundation (DFG) for their financial support.; 20th International ESAFORM Conference on Material Forming, ESAFORM 2017 ; Conference date: 26-04-2017 Through 28-04-2017",
year = "2017",
month = oct,
day = "16",
doi = "10.1063/1.5008158",
language = "English",
series = "AIP Conference Proceedings",
publisher = "American Institute of Physics Inc.",
editor = "Dermot Brabazon and {Ul Ahad}, Inam and Sumsun Naher",
booktitle = "Proceedings of the 20th International ESAFORM Conference on Material Forming, ESAFORM 2017",
}