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Effect of E21-Fe3AlC Precipitation on Mechanical Properties of γ -Austenite Stabilized by Addition of Mn and Co

Published online by Cambridge University Press:  21 March 2011

Seiji Miura ,
Hiroaki Ishii  and
Tetsuo Mohri
Seiji Miura*
Affiliation:
Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060–8628, Japan.
Hiroaki Ishii
Affiliation:
Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060–8628, Japan.
Tetsuo Mohri
Affiliation:
Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060–8628, Japan.
*
1 Corresponding author, [email protected]
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Abstract

Effects of Co addition on the phase relation and mechanical properties of an E21-Fe3AlC phase in the Fe-Mn-Al-C system are investigated. The relation between the γ-austenite and E21 phases is the same with Co-free alloys. Two kinds of precipitation processes of E21 phase from γ-austenite matrix are observed: a fine E21 phase precipitation and a cellular structure formation from grain boundaries. The cellular structure formation is explained in relation to the lattice mismatch evaluated by XRD.

The lattice mismatch is estimated to be ∼3%, rather higher than that of γ/γ′ in Ni-based superalloys, and the volume fraction of the E21-Fe3AlC phase precipitated in the γ-austenite phase is as large as 30%. The micro-vickers hardness increases with increasing Al or C, caused by the increase in the volume fraction of the E21-Fe3AlC phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N5.20.1
Copyright
Copyright © Materials Research Society 2001

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Footnotes

2

Graduate Student, Graduate School of Engineering, Hokkaido University.

References

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