期刊
ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES
卷 73, 期 -, 页码 115-123出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S2053273316020350
关键词
orientation relationships; Nishiyama-Wassermann; Kurdjumov-Sachs; Pitsch; Greninger-Troiano; Bain; inverse Greninger-Troiano; steel; ratio of tetragonality; transformation strains; f.c.c. to b.c.c. transformations; f.c.c. to b.c.t. transformations
资金
- European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013)/ERC [291053]
The identification of orientation relationships (ORs) plays a crucial role in the understanding of solid phase transformations. In steels, the most common models of ORs are the ones by Nishiyama-Wassermann (NW) and Kurdjumov-Sachs (KS). The defining feature of these and other OR models is the matching of directions and planes in the parent face-centred cubic gamma phase to ones in the product body-centred cubic/tetragonal alpha/alpha ' phase. In this article a novel method that identifies transformation strains with ORs is introduced and used to develop a new strain-based approach to phase-transformation models in steels. Using this approach, it is shown that the transformation strains that leave a close-packed plane in the gamma phase and a close-packed direction within that plane unrotated are precisely those giving rise to the NW and KS ORs when a cubic product phase is considered. Further, it is outlined how, by choosing different pairs of unrotated planes and directions, other common ORs such as the ones by Pitsch and Greninger-Troiano can be derived. One of the advantages of our approach is that it leads to a natural generalization of the NW, KS and other ORs for different ratios of tetragonality r of the product body-centred tetragonal alpha ' phase. These generalized ORs predict a sharpening of the transformation textures with increasing tetragonality and are thus in qualitative agreement with experiments on steels with varying alloy concentration.
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