On {h,1,1}<1/h,1,2>, the Recrystallisation Texture of Heavily Cold Rolled BCC Steel

Abstract

Heavily cold rolled BCC steel has been indicated to generate {411}&lt;148&gt; recrystallisation texture and its family orientations which might be represented as {h,1,1}&lt;1/h,1,2&gt;. As a-fibre structure, or RD//&lt;011&gt; texture is significantly developed during the cold rolling, it is naturally speculated to be the recrystallisation site of {h,1,1}&lt;1/h,1,2&gt; fibre. The present paper prompts to demonstrate the recrystallisation procedure by utilising EBSP-OIM analysis. The first demonstration was carried out with OIM analysis on partially recrystallised cold rolled steel. At the stage of 50% recrystallisation, only ND//&lt;111&gt; texture has appeared for the recrystallised area. {100}&lt;011&gt; - {211}&lt;011&gt; a-fibre remains as deformed structure, and several {h,1,1}&lt;1/h,1,2&gt; grains could be found at the grain boundaries. Therefore, a bi-crystal of {100}&lt;011&gt; was employed to simulate the irregular deformation at the grain boundary. After cold rolling, a warp toward the grain boundary was observed. Although the interior of the {100}&lt;011&gt; single crystal was hardly recrystallised, sharp {411}&lt;148&gt; texture was created along the grain boundary. In order to confirm the phenomenon, another experiment was carried out that a cold rolled {100}&lt;011&gt; single crystal was bent along the rolling direction and annealed. Very sharp {411}&lt;148&gt; recrystallisation texture was formed again at the bent perimeter. These experimental results lead us to conclude that the irregular strain was sufficiently piled at the grain boundary after the heavy deformation and generates {h,1,1}&lt;1/h,1,2&gt; texture. On {100} pole figures, the recrystallisation textures were equivalently scattered around three &lt;100&gt; poles, therefore the rotation relationship around &lt;111&gt; axes with the original orientation was suggested.

Through process texture evolution and magnetic properties of high Si non-oriented electrical steels

“…The origin and evolution of the α*-fibre during recrystallization are not well understood. The results of the present study are consistent with the literature sources [36][37][38] …”

Texture Evolution in Si‐Alloyed Ultra Low‐Carbon Steels after Severe Plastic Deformation

“…On the one hand, there is the {h11}<1/h,1,2> fibre, of which the skeleton line is parallel to the conventional <110>//RD fibre in the w 2 ¼ 458 section and which runs from the {001}<211> component down to the {111} fibre. The intensity distribution on this fibre shows a maximum in the vicinity of the {113}<136> component identical to that reported by Homma et al [6] and Kestens et al [7] On the other hand, and opposed to expectations, also the {111} fibre is present in these textures with a relative maximum on the {111}<112> component. Although the absolute maximum of the annealing textures is always observed in the vicinity of the {113}<136> component, the minor maximum on the {111}<112> component is of technical relevance as it will decrease the fraction of <100> directions in the plane of the sheet and, therefore, will impair the magnetic properties of the material.…”

“…It has been shown that after accumulated roll bonding (ARB) of interstitial-free (IF) steel to an accumulated true logarithmic strain of 6.9 (corresponding to a reduction of 99.90%, or 10 ARB passes of 50% reduction each) the deformation texture features a particularly intense <110>//RD fibre with a maximum at the rotated cube component ({001}<110>). After recrystallization annealing of specimens reduced to 96.9% (5 passes), the annealing texture is characterized by a developing fibre texture previously described by Homma et al [6] as a {h11}<1/h,1,2> fibre. After a total reduction of 99.6%, the absolute maximum of the ODF (orientation distribution function) shifted towards a component on this {h11}<1/h,1,2> fibre, i.e., the {311}<136> orientation Conventional thermomechanical processing of low-carbon steels leads to a characteristic texture dominated by a strong <111>//ND fiber after recrystallization.…”

Microstructure and texture evolution during the ultra grain refinement of the Armco iron deformed by accumulative roll bonding (ARB)

“…8b). This {311}/136S component is characteristic of the recrystallized state of a highly cold-rolled BCC materials [22][23][24] due to an oriented nucleation from the strained rotated cube component that reveals internal orientation gradients at the deformed state.…”