Journal
ACTA MATERIALIA
Volume 81, Issue -, Pages 230-240Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.08.008
Keywords
Tempered martensite ferritic steels; Creep; Laves phase; Transmission electron microscopy; Atom probe tomography
Funding
- International Max Planck Research School for Surface and Interface Engineering in Advanced Materials, IMPRS-SurMat
- Max-Planck Fellow Group of High Temperature Materials at MPIE
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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.
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