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Grain Refinement for Strengthening in Fe3Al-based Alloys Through Thermomechanical Processing

Published online by Cambridge University Press:  01 February 2011

Satoru Kobayashi ,
Akira Takei  and
Takayuki Takasugi
Satoru Kobayashi
Affiliation:
kobayashi@imr.tohoku.ac.jp, Tohoku University, Osaka, Japan
Akira Takei
Affiliation:
cm0504@mtr.osakafu-u.ac.jp, Osaka Prefecture University, Osaka, Japan
Takayuki Takasugi
Affiliation:
takasugi@mtr.osakafu-u.ac.jp, Osaka Prefecture University, Osaka, Japan
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Abstract

A thermomechanical process (TMP) for grain refinement was performed in bulk Fe3Al-based alloys containing ˜10% volume fraction of κ-Fe3AlC precipitates. In the TMP, κ particles play an important role in reducing the inhomogeneity of recrystallization due to the matrix orientation. The grain size was refined to ˜20 μm by optimizing the κ particle size. A fine-grained and pancake/recovered microstructure fabricated by the TMP showed more than 1200 MPa tensile strength and 8% tensile ductility at room temperature in air. The tensile strength of this material was higher than those of conventional wrought Fe3Al alloys at temperatures between room temperature and 500 °C, and the specific tensile strength was as high as that of the Ti-6Al-4V alloy at temperatures above 400 °C.

Keywords

microstructuresecond phasesgrain size
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1128: Symposium U – Advanced Intermetallic-Based Alloys for Extreme Environment and Energy Applications , 2008 , 1128-U02-03
Copyright
Copyright © Materials Research Society 2009

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