Hiroshi Kaneko, Tatsuya Morikawa, Masaki Tanaka, Hirofumi Inoue, Kenji Higashida
The effect of controlling the crystal orientation distribution (= texture) with respect to the bending workability of the metal materials and its mechanism are reported. In this study, at first, the crystal orientation map in the material after bending was analyzed in detail, and it was elucidated that the shear bands concentrate in the planar region at a 35-40° inclination from the surface. Bending cracks occur along this shear bands and are an important control factor for the workability. Next, it was found that by controlling the texture of the workpiece, the development of the shear band is suppressed and the bending workability is remarkably improved. For these mechanisms, the assumption of applying the principle of the minimum plastic work to the multiple slip deformation of the crystal is effective, and the angle of the shear deformation and the crystal orientation in which the shear deformation hardly occurs could be explained consistently.
Furukawa Electric has been engaged in the business in many areas such as infrastructure, automobiles, electronics and others from materials. The new technology, found this time, to control the crystal state of the metallic materials will be further developed in a number of applications, and we will address to various requests from customers on improvement of design freedom, productivity development etc..
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