抄録
In order to study the formation of the deformation and transformation textures during drawing at room temperature, the amount of strain-induced martensite has been estimated from the X-ray diffraction intensity and hardness, and the changes in the fiber axis during drawing have been investigated by means of the pole figure determination and electron diffraction.
The orientation relationship in γ-α′ transformation induced by drawing was found to coincide with the K-s relation, that is {111}γ\varparallel{110}α′ and ⟨110⟩γ\varparallel⟨111⟩α′.
In the case of 18Cr-8Ni steel, the amount of strain-induced martensite (α′) increases markedly by drawing over 30% reduction. The preferred orientation of austenite is of the ⟨111⟩ fiber axis, while that of martensite is of the ⟨210⟩ fiber axis which rotates toward the ⟨110⟩ axis after drawing to higher reductions.
In the case of 17Cr-12Ni steel, the strain-induced martensitic transformation (γ→α′) does not occur. The texture of austenite consists of the ⟨111⟩ fiber axis and the minor orientations of the ⟨511⟩ axis as a twin component and the ⟨100⟩ axis rotated from ⟨511⟩.
In the case of 18Cr-10Ni-3Cu steel, the strain-induced martensitic transformation is detected after drawing over 50% reduction in area. At lower reductions, the ⟨111⟩ fiber axis is developed covering a wide area of austenite, and simultaneously mechanical twins are formed. At higher reductions, the gtrain-induced martensitic transformation occurs both in the matrix and in the twin bands. The fiber axis of the texture transformed from the twin component is ⟨100⟩α′.
