Oxide Layer Evolution of Cast Fe24Cr12NiXNb Heat-Resistant Cast Steels at 900°C in Atmospheric Air

• Autorzy: Ramos P. A. , Coelho R. S. , Pinto H. C. , Soldera F. , Mücklich F. , Brito P. P.

Identyfikatory

DOI

10.24425/afe.2021.136087

• Języki publikacji: EN

Abstrakty

EN

The austenitic stainless steels are a group of alloys normally used under high mechanical and thermal requests, in which high temperature oxidation is normally present due to oxygen presence. This study examines the oxide layer evolution for Fe24Cr12NiXNb modified austenitic stainless steel A297 HH with 0,09%Nb and 0,77%Nb content at 900°C under atmospheric air and isothermal oxidation. The modifiers elements such as Mo, Co and Ti, added to provide high mechanical strength, varied due to the casting procedure, however main elements such as Cr, Ni, Mn and Si were kept at balanced levels to avoid microstructure changing. The oxide layer analysis was performed by confocal laser scanning microscopy (CLS) and scanning electron microscopy (SEM). The elemental analysis of the different phases was measured with energy dispersive X-ray spectroscopy (EDX). The Nb-alloyed steel generated a thicker Cr oxide layer. Generally elemental Nb did not provide any noticeable difference in oxide scale growth, for the specific range of Nb amount and temperature studied. High temperature oxidation up to 120h was characterized by protective Cr oxidation, after this period a non-protective Fe-based oxidation took place. Cr, Fe and Ni oxides were observed in the multilayer oxide scale.

Słowa kluczowe

EN

austenitic cast steel; microstructure; Nb-alloyed steels; oxidation

PL

staliwo austenityczne; mikrostruktura; stal stopowa; utlenianie

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2021
• Tom: Vol. 21, iss. 1
• Strony: 125--131
• Opis fizyczny: Bibliogr. 18 poz., rys., tab., wykr.

Twórcy

autor

Ramos P. A.

• Pontifical Catholic University of Minas Gerais, Brazil
• Federal Institute of Science and Technology of Minas Gerais, Brazil

autor

Coelho R. S.

• SENAI CIMATEC, Institute of Innovation for Forming and Joining of Materials, Salvador-BA, Brazil

autor

Pinto H. C.

• Department of Materials Engineering - SMM, São Carlos School of Engineering – EESC, University of São Paulo, São Carlos, SP, Brazil

autor

Soldera F.

• Saarland University, Department of Materials Science, Chair of Functional Materials, Saarland, Germany

autor

Mücklich F.

• Saarland University, Department of Materials Science, Chair of Functional Materials, Saarland, Germany

autor

Brito P. P.

• Pontifical Catholic University of Minas Gerais, Brazil

Bibliografia

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).