Recrystallisation of heavily cold rolled RD//(011) structure in BCC iron

The present paper prompts to demonstrate the recrystallisation procedure of h, 1, 11(1/h, 1,2 fibre from heavily cold rolled a-fibre structure, or RD// 01 1) texture. Firstly the partially recrystallised cold rolled steel was analysed with OIM measurement. At the stage of 50% recrystallisation, I I 001}{011)- 21 1)(011) a-fibre was remained as deformed structure, and only ND H (I 11) texture was appeared for the recrystallised area. The slight recrystallisation was observed at the grain boundary of a-fibre grains, therefore, a by-crystal of I 1001(0 11 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 1001(01 1) 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 ( 1001(0 11 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}(l1h,I,2) texture. The orientation relationship in recrystallisation was confirmed by another recrystallisation that a 12111(011) single crystal generated another {H,I,1}(1,h,l,2), equivalently rotated around RD with the rotation from { I 001 {{ 11) to 1211 {(01 1). These recrystallisation textures were equivalently scattered around three (I 00 poles on (100) pole figures, therefore the rotation relationship around (I 11) axes with the original orientation was discussed.