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Can inherited textures in the B.c.c. phase furnish information about the type of transformation from the F.c.c. phase?
Author(s) -
Jung V.
Publication year - 1983
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889883010961
Subject(s) - crystallography , phase (matter) , materials science , diffraction , cylinder , deformation (meteorology) , neutron diffraction , orientation (vector space) , slipping , transformation (genetics) , distribution (mathematics) , physics , geometry , optics , chemistry , composite material , mathematics , mathematical analysis , biochemistry , quantum mechanics , gene
Stretching annealed cylindrical 18/8 Cr Ni steels produces transformed h.c.p. and b.c.c. phases, both showing major textural contributions with increasing stretching of the cylindrical specimens. After stretching, the original f.c.c. phase shows two orientations: [100] f.c.c. ] || cylinder axis and [111] f.c.c. = || cylinder axis, i.e. direction of stress. In both cases, the martensitic phase is produced by slipping and shear in the f.c.c. → h.c.p. → b.c.c. sequence by Nishiyama–Wasserman (N–W) or Kurdjumov–Sachs (K–S) transformations in the (111) f.c.c. planes, which enclose angles ≠ 0, 90° with the direction of stress, i.e. the cylinder axis. The orientation distributions of the (110) b.c.c. reflexion, calculated by means of a very simple model, are compared with the distribution measured by neutron diffraction to obtain information on the bulk material. The special K–S transformation with only six (110) b.c.c. orientations in the ω scan together with the special N–W transformation with six orientations in the ω scan show relatively good agreement with the measured distribution. Both transformation processes are based on continuous tilting of the newly formed (110) b.c.c. planes in the direction of the cylinder axis during the deformation process.