Abstract
The present paper prompts to demonstrate the recrystallisation procedure of {h, 1, 1}(1/h, 1, 2)fibre from heavily cold rolled α-fibre structure, or RD //<011> texture. Firstly the partially recrystallised cold rolled steel was analysed with OIM measurement. At the stage of 50% recrystallisation, {100}<011>-{211}<011> α-fibre was remained as deformed structure, and only ND//<111> texture was appeared for the recrystallised area. The slight recrystallisation was observed at the grain boundary of α-fibre grains, therefore, a by-crystal of {100}<011> was employed to simulate the irregular deformation at the grain boundary. After the cold rolling, a warp toward the grain boundary was observed. Although the interior of the {100}<011> single crystal was hardly recrystallised, sharp {411}<148> texture was created along the grain boundary. In order to recreate the phenomenon at the grain boundary, a cold rolled {100}<011> single crystal was bent along the rolling direction and annealed. Very sharp {411}<148> recrystallisation texture was formed again at the bent perimeter. These results suggest that the irregular strain was sufficiently piled at the grain boundary after the heavy deformation and generates {h, 1, 1}(1/h, 1, 2) texture. The orientation relationship in recrystallisation was confirmed by another recrystallisation that a {211}<011> single crystal generated another {h, 1, 1}(1/h, 1, 2), equivalently rotated around RD with the rotation from {100}<011> to {211}<011>. These recrystallisation textures were equivalently scattered around three <100> poles on (100) pole figures, therefore the rotation relationship around <111> axes with the original orientation was discussed.
