Preliminary communication

Influence of selected rare earth metals on structural characteristics of 42CrMo4 steel

J. Drápala ; VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
S. Brožová ; VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
I. Szurman ; VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
K. Konečná ; VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
G. Kostiuková ; VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
J. Vontorová ; VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
P. Jonšta ; Vitkovice Heavy Machinery, a.s., Ostrava – Vítkovice, Czech Republic
K. Sobotková ; Tescan Orsay Holding, a.s., Brno, Czech Republic

Abstract

The influence of rare earth metals (REM) addition on solidification structure of the low-carbon 42CrMo4 steel was investigated. Alloys were prepared by means of a centrifugal casting. The addition of cerium, praseodymium or mischmetal in the steel produced greatly improved solidification structure with a suppressed columnar grain zone, finer grain size in the equiaxed grain zone. The additions occurred in the steel bath in the form of REM oxide and/or oxide-sulphide inclusions and as dissolved REM segregated along with other elements at prior grain boundaries and interdendritic spaces. Microstructure (light microscope), SEM/EDX chemical microanalysis, and TOF-SIMS analysis – mapping of elements in the structure of alloys were obtained.

Keywords

Low-carbon 42CrMo4 steel; rare earth metals; centrifugal casting; structure; inclusions

Hrčak ID:

157443

URI

https://hrcak.srce.hr/157443

Publication date:

1.10.2016.

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