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On the nucleation of Laves phase particles during high-temperature exposure and creep of tempered martensite ferritic steels

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Isik,  M. I.
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Kostka,  A.
High-Temperature Materials, External Max Planck Fellow, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Isik, M. I., Kostka, A., & Eggeler, G. (2014). On the nucleation of Laves phase particles during high-temperature exposure and creep of tempered martensite ferritic steels. Acta Materialia, 81, 230-240. doi:10.1016/j.actamat.2014.08.008.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0026-B500-1
Abstract
This paper reports on the formation of an Mo-rich Laves phase during high-temperature exposure and creep of a tempered martensite ferritic steel with 12 wt.% Cr and 1 wt.% Mo. The material was exposed to 550 degrees C for time intervals between 864 and 81,984 h. For comparison, a few creep tests were carried out at 550 degrees C and 120 MPa (duration between 864 and 12,456 h). All tests were interrupted after specific time periods and microstructures were investigated using transmission electron microscopy and atom probe tomography. Laves phase formation occurs during both heat treatment and creep. Creep stress and strain have no significant effect on the early stages of Laves phase formation. In the present work we show that prior to Laves phase nucleation Si and Mo segregate to micrograin boundaries, where subsequently Laves phase particles appear next to M23C6 carbides. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.