日本金属学会誌

J. Japan Inst. Metals, Vol. 54, No. 4 (1990),
pp. 372-380

Coincidence Lattice Relationships and Secondary Recrystallization Textures Composed of (100)[001] and (100)[011] Orientations in 3%Si-Fe Alloy

Jirou Harase1, Ryo Shimizu1 and Nobuyuki Takahashi1

1Electrical Steel Lab., R & D Laboratories III, Nippon Steel Corporation, Kita-Kyushu

Abstract:

Secondary recrystallization textures composed of (100)[001] and (100)[011] orientations are evolved from a cross-rolled (60% reduction) and annealed 3%Si-Fe. The (100)[011] secondary recrystallization texture is mainly evolved when cross rolled with 70% reduction.
(1) In the case of 60% reduction, (100)[001] grains are evolved as this orientation has the highest value of IC Σ 7 in a matrix texture before grain growth and the intensity of the (100)[001] nucleus (IN) is higher than a critical value. Here IC Σ 7 is a intensity of Σ 7 oriented grains in relation to the (100)[001] orientation in a matrix texture before grain growth.
(100)[011] grains are evolved as this orientation has the highest PCN Σ 7 value in a matrix texture before grain growth. Here the PCN Σ 7 value is a product of a intensity of a nucleus orientation (IN), namely, (100)[011], and IC Σ 7 in relation to the (100)[011] orientation in a matrix texture before grain growth.
(2) In the case of 70% reduction, (100)[011] grains are evolved by the same mechanism mentioned above. The (100)[001] secondary texture is scarcely evolved in spite of the highest IC Σ 7 value in relation to the (100)[001] orientation. This is due to the low IN value of the (100)[001] orientation in a matrix texture before grain growth.
(3) The present results support a grain growth theory proposed by the present authors that the texture evolution by grain growth are closely associated with the intensity of the grains in coincidence lattice relationships and the intensity of the inhibitor.


(Received 1989/8/9)

Keywords:

recrystallization, secondary recrystallization, coincidence boundary, grain boundary migration, inhibitor, texture


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