J. Phys. IV France 112 (2003) 333
Morphology and crystallography of nano-sized -martensite in an austenitic stainless steelT. 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
Morphology and crystallography of nano-sized -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 -martensites were 5~10 nm. There are few studies in which such fine -martensites have been observed in detail. The nano-sized -martensites had K-S orientation relationship (OR), i.e., (1 1) // ( 10) , [ 01] //  and their habit plane was (2 2) of the austenite. The shape of the observed nano-sized -martensite seemed to be a bundle of plate-like -martensites which are parallel to (2 2) , a nm in thickness. (2 2) 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 -martensites formed at intersecting twins, even a few nm in thickness, bas a conformity with that of fully-grown one.
© EDP Sciences 2003