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Numéro
J. Phys. IV France
Volume 112, October 2003
Page(s) 333 - 336
DOI https://doi.org/10.1051/jp4:2003895


J. Phys. IV France 112 (2003) 333
DOI: 10.1051/jp4:2003895

Morphology and crystallography of nano-sized $\alpha'$-martensite in an austenitic stainless steel

T. Inamura1, K. Takashima2 and Y. High2

1  Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
2  Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan


Abstract
Morphology and crystallography of nano-sized $\alpha'$-martensites, which were formed at intersections of twin-plates in a commercially available Fe-17Cr-10Ni-1.4Mn-2.1Mo-0.06C alloy (316-type austenitic stainless steel), were examined by transmission electron microscopy. The cross sectional diameter of the observed $\alpha'$-martensites were 5~10 nm. There are few studies in which such fine $\alpha'$-martensites have been observed in detail. The nano-sized $\alpha'$-martensites had K-S orientation relationship (OR), i.e., (1 $\bar{1}$1) $\gamma$ // ( $\bar{1}$10) $\alpha$, [ $\bar{1}$01] $\gamma$ // [111] $\alpha$ and their habit plane was (2 $\bar{5}$2) $\gamma$ of the austenite. The shape of the observed nano-sized $\alpha'$-martensite seemed to be a bundle of plate-like $\alpha'$-martensites which are parallel to (2 $\bar{5}$2) $\gamma$, a nm in thickness. (2 $\bar{5}$2) $\gamma$ is a unique habit plane to the martensite having the K-S OR described above, in this alloy system. It is revealed that the morphology of the nano-meter sized $\alpha'$-martensites formed at intersecting twins, even a few nm in thickness, bas a conformity with that of fully-grown one.



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