Precipitation of nitrides and carbides during solidification and cooling
This joint research project on precipitation status and precipitation-related defects was performed at five different research locations, namely Corus UK, IEHK Aachen University (Germany), Swedish Institute for Metallurgical Research (SIMR) (Sweden), Sidenor I + D (Spain) and ThyssenKrupp Stahl (TKS) (Germany), the latter acting as coordinator. Focus was also put on microalloyed LC and ULC steels of Ti, Nb, V, Ti/Nb, V/Ti, V/Nb/Ti types as well as on HSLA grades and special Cr-V-Mo grades for rolling mill rollers. The investigated specimens have been taken from plant trials, slab and bloom casters, from strip casting trials, from ingot casting and from different laboratory experiments. This means that cooling rates from a wide range up to 1 000 K/sec have been applied to the different samples. The two academic institutes, SIMR and the Department of Ferrous Metallurgy Aachen University (IEHK), worked mainly in the laboratory; the industrial partners Corus UK and TKS worked in the laboratory and at the plant; while Sidenor focused its work on plant trials. Parallel to the experimental investigations, the thermodynamic properties of the Fe-M-C-N systems with M = Ti, Nb, V and Al has been reviewed and compared with experimental data for HSLA steels. The solubility of nitrides and carbides in the liquid phase, austenite and ferrite has been evaluated. In order to gain an understanding of the precipitation mechanisms and the transformation of austenite to ferrite during cooling under the different thermo-mechanical histories associated with the caster, a hot ductility programme was undertaken using samples prepared from a cast that was microalloyed using niobium plus titanium.
Bibliographic Reference: EUR 22060 EN (2006), 303 pp. Euro: 35
Availability: Katalogue Number: KI-NA-22060-EN-S The paper version can be ordered online and the PDF version downloaded at: http://bookshop.europa.eu
ISBN: ISBN: 92-79-01794-2
Record Number: 200719319 / Last updated on: 2007-07-10
Original language: en
Available languages: en