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Nucleation of Proeutectoid Ferrite on Complex Precipitates in Austenite

Published online by Cambridge University Press:  02 July 2020

Tadashi Furuhara ,
Jun Yamaguchi  and
Tadashi Maki
Tadashi Furuhara
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto606-8501, Japan
Jun Yamaguchi
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto606-8501, Japan
Tadashi Maki
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto606-8501, Japan
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Extract

Proeutectoid ferrite (bcc α) nucleation on the inclusions and precipitates dispersed in austenite (fee γ), denoted as intragranular ferrite transformation, has been used to refine the microstructure in the heat affected zone to improve the toughness of low and medium carbon steels. It is currently considered that Bl(NaCl)-type complex inclusions/precipitates (e.g. oxide, sulfide, carbide, nitride) are promising ones as ferrite nucleation sites. The present study aims to study the ability of various complex inclusions/precipitates in austenite as nucleation sites in proeutectoid ferrite transformations by standard and analytical electron microscopy.

Table 1 shows the chemical composition of Fe-2Mn-0.2C hypoeutectoid steels with various alloying element additions to change the inclusions/precipitate in austenite. Steel A contains a large density of MnS with the sulfur addition of 470ppm. Steels B and C also contain similar dispersion of MnS as Steel A.

Type
Phase Transformations
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 340 - 341
Copyright
Copyright © Microscopy Society of America

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References

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