J. Phys. IV France
Volume 112, October 2003
Page(s) 209 - 212

J. Phys. IV France
112 (2003) 209
DOI: 10.1051/jp4:2003867

Grouping of $\{15\, 3\, 10\}$ and $\{225\}$ martensite crystals and 3-D geometrical model of filling austenite grains by martensite

M.N. Pankova

G.V. Kurdyumov Institute for Metal Physics and Functional Materials, I.P. Bardin State Science Center for Ferrous Metallurgy, 2$^{\rm nd}$ Baumanskaya 9/23, 105005 Moscow, Russia

New variant of grouping of martensite platelets was observed experimentally for the $\{15. 10. 3\}$ and $\{522\}$ martensites. This variant represents a closed rhombic bipyramid faced eight habit planes of the same type united around one common direction $\langle 110\rangle$. The space of an austenite grain is filled by joining bipyramids with common edges into larger bipyramids of the next hierarhical level. Different variants of outgrowing faces in pyramidal groups in combination with different sectioning plane of the specimen allow to explain all observed morphological variants of the grouping martensite.

© EDP Sciences 2003