期刊
ACTA MATERIALIA
卷 90, 期 -, 页码 94-104出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2015.01.027
关键词
Tempered martensite ferritic steels; Laves phase; M23C6 carbides; Transmission electron microscopy (TEM); Atom probe tomography (APT)
资金
- International Max Planck Research School for Surface and Interface Engineering in Advanced Materials, IMPRS-SurMat
- Max-Planck-Gesellschaft through the Max-Planck Fellow Group on High Temperature Materials at MPIE, Dusseldorf
We study the nucleation of Mo-rich Laves phase particles during aging and creep of 12 wt.% Cr tempered martensite ferritic steels (TMFS). Recently, in Isik et al. (2014) we reported that Laves phase particles tend to form at micrograin boundaries of TMFSs after Mo and Si had segregated from the ferritic matrix to these internal interfaces. In the present work, we employ transmission electron microscopy (TEM) and atom probe tomography (APT) to study the formation of Laves phase particles. We investigate the preference of Laves phase particles to nucleate next to M23C6 micrograin boundary carbides. Our results suggest that this joint precipitation effect is due to the combined segregation of Mo and Si from the matrix to the micrograin boundaries and Si and P enrichment around the growing carbides. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
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