Influence of the rare-earth elements on the morphology of non-metallic inclusions in microalloyed steels

• Autorzy: Opiela M. , Kamińska M.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The modification of the chemical composition of non-metallic inclusions by rare-earth elements in the new-developed microalloyed steels was discussed in the paper. The investigated steels are assigned to production of forged elements by thermo-mechanical treatment. Design/methodology/approach: The modification of the chemical composition of non-metallic inclusions by rare-earth elements in the new-developed microalloyed steels was discussed in the paper. The investigated steels are assigned to production of forged elements by thermo-mechanical treatment. Findings: The high metallurgical purity is confirmed by a small fraction of non-metallic inclusions averaging 0.075%. A large majority of non-metallic inclusions are fine, globular oxide-sulfide or sulfide particles with a mean area 17 μm2. The chemical composition and morphology of non-metallic inclusions was modified by Ce, La and Nd, what results in a small deformability of non-metallic inclusions during hot-working. Research limitations/implications: Transmission electron microscopy investigations of non-metallic inclusions after initial hot-plastic working is predicted. Practical implications: Introduction of mischmetal in the amount of 2 g per 1 kg of steel causes total modification of chemical composition of non-metallic inclusions. Originality/value: The presence of dispersive, complex modified oxysulfide-type non-metallic inclusions can have advantageous influence on a decrease of grain growth of austenite during hot working similarly as MX interstitial phases. The factors mentioned above should favour the production of forgings with high strength and ductility.

Słowa kluczowe

EN

rare earth elements (REE); modification of non-metallic inclusions; microalloyed steels

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2011
• Tom: Vol. 47, nr 2
• Strony: 149--156
• Opis fizyczny: Bibliogr. 35 poz., rys., tab.

Twórcy

autor

Opiela M.

• Division of Constructional and Special Materials, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Polan

autor

Kamińska M.

• Non-Ferrous Metals Institute, ul. Sowińskiego 5, 44-100 Gliwice, Poland

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