Thixoforging of Steel Using Ceramic Tool Materials

authored by: Bernd-Arno Behrens, Björn Haller, Dirk Fischer
Abstract: Today thixoforming processes are mainly established in the production of parts made of aluminium alloys. Compared to high melting alloys the process temperature is low and thus the process is easier to handle. Because of process temperatures up to 1470°C thixoforming of steels demands a sophisticated process control and adapted tool materials. In this field there is still a large need for research. This paper deals with experiences made at the IFUM concerning the thixoforging of steel. The use of ceramic tool materials for thixoforging of steel is presented. For this purpose hybrid dies where a ceramic insert is prestressed with a hot working steel shrink ring as well as different stamp geometries were developed and built up. Different ceramic materials from Si₃N₄ to ZrSiO₄ were tested and evaluated. To prevent an unwanted cooling and oxidation of the slug during its transfer, the transfer is carried out encapsulated in high temperature resistant crucibles that can provide a protective atmosphere. The suitability (e.g. thermo shock resistance) of different materials for the use as transport crucibles was also subject of this research work. The forming experiments were carried out with the institute's hydraulic press. The process logic controller of this press offers the appropriate flexibility and various control modes needed for a sophisticated and reproducible filling of the die. In this way the die filling process of different steels can be tested.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
Type: Article
Journal: Steel research international
Volume: 75
Pages: 561-568
No. of pages: 8
ISSN: 1611-3683
Publication date: 08.2004
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Condensed Matter Physics, Physical and Theoretical Chemistry, Metals and Alloys, Materials Chemistry
Electronic version(s): https://doi.org/10.1002/srin.200405811 (Access: Closed)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{7a79c0d08ee94a19a0e757862c2dcac6,
title = "Thixoforging of Steel Using Ceramic Tool Materials",
abstract = "Today thixoforming processes are mainly established in the production of parts made of aluminium alloys. Compared to high melting alloys the process temperature is low and thus the process is easier to handle. Because of process temperatures up to 1470°C thixoforming of steels demands a sophisticated process control and adapted tool materials. In this field there is still a large need for research. This paper deals with experiences made at the IFUM concerning the thixoforging of steel. The use of ceramic tool materials for thixoforging of steel is presented. For this purpose hybrid dies where a ceramic insert is prestressed with a hot working steel shrink ring as well as different stamp geometries were developed and built up. Different ceramic materials from Si3N4 to ZrSiO4 were tested and evaluated. To prevent an unwanted cooling and oxidation of the slug during its transfer, the transfer is carried out encapsulated in high temperature resistant crucibles that can provide a protective atmosphere. The suitability (e.g. thermo shock resistance) of different materials for the use as transport crucibles was also subject of this research work. The forming experiments were carried out with the institute's hydraulic press. The process logic controller of this press offers the appropriate flexibility and various control modes needed for a sophisticated and reproducible filling of the die. In this way the die filling process of different steels can be tested.",
keywords = "Ceramic tools, Semi-solid metal forming, Thixoforging",
author = "Bernd-Arno Behrens and Bj{\"o}rn Haller and Dirk Fischer",
year = "2004",
month = aug,
doi = "10.1002/srin.200405811",
language = "English",
volume = "75",
pages = "561--568",
journal = "Steel research international",
issn = "1611-3683",
publisher = "Wiley-Blackwell",
number = "8-9",
}