Hostname: page-component-586b7cd67f-rcrh6 Total loading time: 0 Render date: 2024-11-24T18:46:57.383Z Has data issue: false hasContentIssue false
  • English
  • Français

Microstructure Control Using Precipitate Phases for the Development of Heat Resistant Fe3Al-based Alloys

Published online by Cambridge University Press:  26 February 2011

Satoru Kobayashi  and
Stefan Zaefferer
Satoru Kobayashi
Affiliation:
[email protected], Institute for Materials Research, Tohoku University, Osaka Center for Industrial Research, Gakuen-cho 1-1, Naka-ku, Sakai, Osaka, 599-8531, Japan
Stefan Zaefferer
Affiliation:
[email protected], Max Planck Institut fuer Eisenforschung GmbH, Max Planck Str. 1, Duesseldorf, 40237, Germany
Get access

Abstract

A thermomechanical process (TMP) was performed to create a fine grained and recovered structure with densely formed fine particles in Fe3Al-Cr-Mo-C alloys. The TMP consists of two parts; the first part is to obtain fine recrystallised grains using coarse particles and the second to produce deformed/recovered structure using fine particles. It was found that k-Fe3AlC (E21) carbide phase tends to precipitate coarsely, which is effective to refine grain size in the first process. In a special composition range, the k carbide phase is thermo- dynamically stable in the Fe3Al matrix only at higher temperatures and fine M(Mo,Cr,Fe)2C (B81) carbide phase precipitates at lower temperatures. This fine M2C particles stabilize recovered structure by inhibiting the migration of subboundaries in the second process. This result suggests that if the fine particle density remains high, recovered structure can be maintained at 700°C.

Keywords

microstructurephase transformationscanning electron microscopy (SEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II01-03
Copyright
Copyright © Materials Research Society 2007

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

[1] Morris, D.G.. In: Schneibel, J.H., Crimp, M.A., editors. Processing, properties and applications of iron aluminides. Warrendale, PA: TMS; 1994. p. 3.Google Scholar
[2] Stoloff, N.S.: Mater Sci Eng A Vol. 258 (1998) p.1.10.1016/S0921-5093(98)00909-5Google Scholar
[3] Viswanathan, R.: Advanced Materials & Processes August (2004) p. 73.Google Scholar
[4] Kobayashi, S., Zaefferer, S., Schneider, A., Raabe, D., Fommeyer, G.: Intermetallics Vol. 13 (2005), p. 1296.10.1016/j.intermet.2004.10.016Google Scholar
[5] Kobayashi, S., Zaefferer, S., Schneider, A.. In: Miller, M. J. et al, editors. Materials Research Society Symposium Proc. Vol. 842, MRS, (2005) pp. 47–52.Google Scholar
[6] Kobayashi, S., Zaefferer, S.: Intermetallics Vol. 13 (2006), p. 1252.10.1016/j.intermet.2005.11.034Google Scholar
[7] Kobayashi, S., Zaefferer, S.: Journal of Alloys and Compounds submitted.Google Scholar
[8] Kobayashi, S., Zaefferer, S.: To be published.Google Scholar
[9] Humphreys, F.J.: Acta Metall. Vol. 25 (1977), p. 1323.Google Scholar