抄録
The textures of Fe-30.2 wt%Ni alloy sheets rolled at 150°C and subjected to a sub-zero treatment and annealings were determined by the X-ray pole figure method to study the selection of the orientation relationships in the martensitic transformation of the deformed γ-phase and the correlation between the α→γ transformation and the recrystallization.
The texture of the α-phase transformed from the deformed γ-phase by the sub-zero treatment cannot be explained in terms of the equal probability for the 24 crystallographically equivalent Greninger-Troiano’s orientation relations.
The preferred orientations estimated from the maxima of the pole density in the observed pole figure of the α-phase coincide with the orientations derived from (321)[658]γ and (211)[\bar111]γ by the relation: (111)γ\varparallel(101)α, [\bar110]γ 2.6° from [\bar1\bar11]α, [0\bar11]γ 7.9° from [1\bar1\bar1]α, and [1\bar21]γ 2.6° from [10\bar1]α.
On annealing after the sub-zero treatment, the α→γ transformation occurs at 500°C and the γ-phase recrystallizes at 600°C.
The recrystallization texture is not altered by the sub-zero treatment. Main orientations represented by the maxima of the pole density in the recrystallization texture are related to the (211)[\bar111] orientation in the rolling texture by 30°∼40° rotations about ⟨111⟩ axes.
