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Formation of the Fe2Hf Laves Phase through Eutectoid Type Reaction of δ→γ+Fe2Hf in Ferritic Heat Resistant Steels

Published online by Cambridge University Press:  02 March 2015

Satoru Kobayashi
Satoru Kobayashi*
Affiliation:
National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, 305-0047, JAPAN
*
*(Currently Tokyo Institute of Technology, 2-12-1 Ookayama Meguro-ku, 152-8552, JAPAN kobayashi.s@mtl.titech.ac.jp)
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Abstract

Periodically arrayed rows of fine Fe2Hf Laves phase particles were found to form in 9Cr ferritic steel. Microstructural observation demonstrates that the particles were formed on cooling through the interphase precipitation on the phase transformation from the δ ferrite to the γ austenite along the eutectoid transformation route of δ → γ+Fe2Hf and subsequently a phase transformation from the austenite to the α ferrite took place. This eutectoid route is expected to be effectively used for improving the long term creep strength of ferritic steels with Laves phase.

Keywords

microstructurephase transformationphase equilibria

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Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1760: Symposium YY – Advanced Structural and Functional Intermetallic-Based Alloys , 2015 , mrsf14-1760-yy02-08
Copyright
Copyright © Materials Research Society 2015 

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References

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