Manufacturing Technology 2015, 15(3):315-322 | DOI: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/315

Structural Characteristics of Cr-Mo Steels Microalloyed with Cerium

Jaromír Drápala1, Pavel Machovčák2, Petr Jonšta2, Vu The Ha1, Silvie Brožová1, Gabriela Kostiuková1, Michal Madaj1
1 Vysoká škola báňská - Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Regional Materials Science and Technology Centre, Av. 17. listopadu 15, 70833 Ostrava - Poruba, Czech Republic
2 Vítkovice Heavy Machinery a.s., Ruská 2887/101, 703 00 Ostrava - Vítkovice, Czech Republic

The results of an experimental study on influence of cerium addition on structural characteristics of 42CrMo4 steel are presented. Alloying with cerium was carried out using profile filled with powdered mixture of mischmetal. The samples were taken from two ingots cast in the VHM's steelworks with standard time of casting of about 14 minutes. Three steel bars from one of the produced ingots were prepared by forging. Chemical composition, macro- and microstructure, X-ray EDX chemical microanalysis, hardness of the all steel samples 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 casting, indicating that the convection flow during solidification was very weak. The cerium addition slightly diminished hardness of the steel. A segregation phenomenon causing inhomogeneous distribution of cerium over entire volume of as-cast samples after relatively rapid crystallization process of the steel was revealed.

Keywords: CrMo Steel, Cerium, Microstructure, Interaction, Microsegregation

Published: June 1, 2015  Show citation

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Drápala J, Machovčák P, Jonšta P, Ha VT, Brožová S, Kostiuková G, Madaj M. Structural Characteristics of Cr-Mo Steels Microalloyed with Cerium. Manufacturing Technology. 2015;15(3):315-322. doi: 10.21062/ujep/x.2015/a/1213-2489/MT/15/3/315.
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