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- Title
ω-Fe particle size and distribution in high-nitrogen martensitic steels.
- Authors
Ping, D. H.; Ohnuma, M.
- Abstract
Systematical transmission electron microscopy (TEM) studies of the martensitic substructure in quenched Fe-C binary alloys have revealed that the initially formed martensite has twinning structure, and the twin is body-centered cubic {112}<111>-type twin regardless of the carbon concentrations. A metastable hexagonal ω-Fe(C) phase with an ultrafine particle-like morphology is distributed at the twin boundary region. In order to explore the common existence of the ω-Fe in nitrogen steels, the martensitic substructures in high-nitrogen martensitic stainless steels at various conditions (as-quenched, subzero-treated and tempered) have been investigated in detail by means of TEM. The ω-Fe with an ultrafine particle size of 1-3 nm has been observed in all the samples. TEM tilting experiment and electron diffraction analysis have revealed that each martensitic lath or plate is composed of {112}<111>-type twin structure with the ω particles at the twin boundary region. The martensite morphology and the relationship between the twin and the ω phase particles have been discussed crystal geometrically. The ω particle size variation with subzero and tempering treatment has also been discussed based on a proposed dilation and split mechanism. The existence of large amount of twins up to 550 °C simply suggests that the nitrogen atoms have much stronger effect than carbon atoms on the ω phase stability. The present investigation will provide a very clear image about the martensitic substructure in high-nitrogen martensitic stainless steels.
- Subjects
IRON ions; PARTICLE size distribution; MARTENSITIC stainless steel; NITROGEN content of metals; PHYSICS experiments
- Publication
Journal of Materials Science, 2018, Vol 53, Issue 7, p5339
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-017-1938-0