期刊
MICRON
卷 108, 期 -, 页码 11-18出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.micron.2018.02.008
关键词
Laves phase; Microstructure; Intermetallic particles; Ferritic steel; Advanced Ultra Supercritical (AUSC) power plants; Dislocations; Particle-free zones
类别
In the present study a stainless, high strength, ferritic (non-martensitic) steel was analysed regarding microstructure and particle evolution. The preceding hot-rolling process of the steel results in the formation of sub grain structures, which disappear over time at high temperature. Besides that the formation of particle-free zones was observed. The pronounced formation of these zones preferentially appears close to high angle grain boundaries and is considered to be responsible for long-term material failure under creep conditions. The reasons for this are lacking particle hardening and thus a concentration and accumulation of deformation in the particle free areas close to the grain boundaries. Accordingly in-depth investigations were performed by electron microscopy to analyse dislocation behaviour and its possible effect on the mechanical response of these weak areas.
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