STUDY OF CERIUM SEGREGATION DURING SOLIDIFICATION OF LOW-CARBON 42CRMO4 STEEL

1 Drápala Jaromír
Co-authors:
1 Brožová Silvie 1 Madaj Michal 1 Kostiuková Gabriela 1 Szurman Ivo 1 Konečná Kateřina 1 Vontorová Jiřina 2 Machovčák Pavel 2 Jonšta Petr 3 Klosová Kateřina
Institutions:
1 VSB-Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, RMSTC, Av. 17. listopadu 15, 708 33 Ostrava-Poruba, Czech Republic
2 Vítkovice Heavy Machinery a.s., Ruská 2887/101, Vítkovice, 703 00 Ostrava, Czech Republic
3 Demo Lab & Applications, TESCAN ORSAY HOLDING, a.s., Libusina trida 21,623 00, Brno, Czech Republic
Conference:
24th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, June 3rd - 5th 2015
Proceedings:
Proceedings 24th International Conference on Metallurgy and Materials
Pages:
115-122
ISBN:
978-80-87294-58-1
ISSN:
2694-9296
Published:
12th January 2015
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
399 views / 221 downloads
Abstract

The influence of cerium addition on solidification structure of the low-carbon 42CrMo4 steel was investigated. Alloys were prepared by means of a centrifugal casting. The addition of up to 0.05 wt. % of Ce in the steel produced greatly improved solidification structure with a suppressed columnar grain zone, finer grain size in the equiaxed grain zone, and zero area fraction of casting shrinkage cavity. The added cerium occurred in the steel both in the form of Ce oxide-sulphide inclusions and as dissolved atomic Ce segregated along with other elements at prior austenite grain boundaries and at interdendritic spacings. Microstructure (light optical microscope, SEM), X-ray EDX chemical microanalysis, and TOF-SIMS analysis (TESCAN ORSAY HOLDING) – mapping of elements in the structure of alloys were obtained. Rare-earth metals addition can be considered as a potential solution for grain structure refinement in heavy-weight castings of 42CrMo4 grade steel.

Keywords: 42CrMo4 steel, centrifugal casting, cerium addition, microstructure, inclusion, segregation

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