STUDY OF THE INTERACTION OF MISCHMETALL IN SPECIAL TYPES OF STEELS AT CRYSTALLIZATION PROCESS

1 DRÁPALA Jaromír
Co-authors:
1 BROŽOVÁ Silvie 1 MADAJ Michal 1 VU The Ha 2 MACHOVČÁK Pavel 2 JONŠTA Petr 3 VINŠ Miroslav
Institutions:
1 VSB - Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, RMSTC, Ostrava, Czech Republic, EU
2 Vítkovice Heavy Machinery a.s., Ostrava, Czech Republic, EU
3 Research Centre Rez Ltd., Husinec - Rez, Czech Republic, EU
Conference:
23rd International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 21 - 23, 2014
Proceedings:
Proceedings 23rd International Conference on Metallurgy and Materials
Pages:
139-147
ISBN:
978-80-87294-52-9
ISSN:
2694-9296
Published:
18th June 2014
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
330 views / 138 downloads
Abstract

In the paper the results of the theoretical and experimental study of behaviour of mischmetal and non-ferrous metals in steels will be presented. The samples of two special steels were prepared with micro-alloying of mischmetal by application of plasma metallurgy. Microstructure (light optical microscope, SEM), X-ray EDX chemical microanalysis, and Instrumental Neutron Activation Analysis (Research Centre ež) were obtained. Cerium addition resulted in the formation of micrometer size inclusions which can be utilized for controlling the grain size structure of steel castings. The majority of the particles have settled at the bottom part of the sample, indicating that the convection flow during solidification was very weak. The rare-earth metals (REM) addition slightly diminished hardness of the steel. A segregation phenomena in the distribution of cerium in the volume of special steels after relatively quick crystallization process was found.

Keywords: Steel, rare-earth metals, microstructure, interaction of elements, segregation

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