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Archives of Metallurgy and Materials

The Journal of Institute of Metallurgy and Materials Science and Commitee on Metallurgy of Polish Academy of Sciences

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2300-1909
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The Characterization Of Cast Fe-Cr-C Alloy

CHARAKTERYSTYKA STOPU Fe-Cr-C W STANIE LANYM

K. Wieczerzak
  • Corresponding author
  • AGH UNIVERSITY OF SCIENCE AND TECHNOLOGY, FACULTY OF METALS ENGINEERING AND INDUSTRIAL COMPUTER SCIENCE, AL. A. MICKIEWICZA 30, 30-059 KRAKÓW, POLAND
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/ P. Bała
  • AGH UNIVERSITY OF SCIENCE AND TECHNOLOGY, FACULTY OF METALS ENGINEERING AND INDUSTRIAL COMPUTER SCIENCE, AL. A. MICKIEWICZA 30, 30-059 KRAKÓW, POLAND
  • AGH UNIVERSITY OF SCIENCE AND TECHNOLOGY, ACADEMIC CENTRE FOR MATERIALS AND NANOTECHNOLOGY, AL. A. MICKIEWICZA 30, 30-059 KRAKÓW, POLAND
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  • De Gruyter OnlineGoogle Scholar
/ M. Stępień
  • AGH UNIVERSITY OF SCIENCE AND TECHNOLOGY, ACADEMIC CENTRE FOR MATERIALS AND NANOTECHNOLOGY, AL. A. MICKIEWICZA 30, 30-059 KRAKÓW, POLAND
  • Other articles by this author:
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/ G. Cios
  • AGH UNIVERSITY OF SCIENCE AND TECHNOLOGY, ACADEMIC CENTRE FOR MATERIALS AND NANOTECHNOLOGY, AL. A. MICKIEWICZA 30, 30-059 KRAKÓW, POLAND
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ T. Kozieł
  • AGH UNIVERSITY OF SCIENCE AND TECHNOLOGY, FACULTY OF METALS ENGINEERING AND INDUSTRIAL COMPUTER SCIENCE, AL. A. MICKIEWICZA 30, 30-059 KRAKÓW, POLAND
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Published Online: 2015-08-03 | DOI: https://doi.org/10.1515/amm-2015-0206

Abstract

The paper presents the results of the characterization of alloy from Fe-Cr-C (carbon content 0.79 wt.%) system including the microstructure, phase analysis, morphology and hardness in as cast state. The chemical composition was designed to create chromium-rich ferritic matrix with high volume fraction of carbides in form of interdendritic eutectics. The research was carried out on the cross section of the ingot, synthesized in an arc furnace under high purity argon atmosphere and crystallized on water-cooled copper mould. Microstructural characterization was carried out by light microscopy and scanning electron microscopy (SEM). Phase identification was performed by X-Ray diffraction (XRD). The microstructure of the investigated alloy is composed of primary and secondary dendrites Fe-Cr solid solution and complex M23C6 and M7C3 carbides in interdendritic areas. Segregation of Cr and C during crystallization causes precipitation of M7C3 carbides. The average hardness of the alloy is 205±12 HV10.

W pracy dokonano analizy mikrostruktury, faz oraz wybranych właściwości stopu w stanie lanym z układu Fe-Cr-C (stężenie węgla 0,79% mas.). Skład chemiczny zaprojektowano tak, aby uzyskać osnowę ferrytyczną bogatą w chrom z dużym udziałem objętościowym węglików eutektycznych. Badania przeprowadzono na przekroju poprzecznym wlewka wykonanego w piecu łukowym w atmosferze ochronnej argonu, krystalizującego na miedzianym łożu, chłodzonym wodą. Obserwacje mikrostruktury przeprowadzono z wykorzystaniem mikroskopii świetlnej oraz skaningowej mikroskopii elektronowej (SEM). Identyfikację faz wykonano za pomocą rentgenowskiej analizy fazowej. Mikrostruktura badanego stopu składa się z dendrytów pierwszo i drugorzędowych roztworu stałego chromu w żelazie α oraz węglików złożonych M23C6 i M7C3, powstałych w obszarach międzydendrytycznych. Segregacja Cr i C podczas krystalizacji, sprzyja wydzielaniu węglików typu M7C3. Średnia twardość stopu wynosi 205±12 HV10.

Keywords: Fe-Cr-C alloy; chromium carbides; cast alloy; segregation

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About the article

Received: 2014-04-20

Published Online: 2015-08-03

Published in Print: 2015-06-01


Citation Information: Archives of Metallurgy and Materials, ISSN (Online) 2300-1909, DOI: https://doi.org/10.1515/amm-2015-0206.

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