Retaining {100} fibre texture in electrical steel via strain-induced boundary migration recrystallisation.
Retaining {100} fibre texture in electrical steel via strain-induced boundary migration recrystallisation.
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DOI：
10.1088/1742-6596/1270/1/012009
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发表时间：
2019-08
期刊：
影响因子：
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通讯作者：
M. Ji;C. Davis;C. Slater
中科院分区：
文献类型：
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作者：
M. Ji;C. Davis;C. Slater
在本文中，研究了通过应变诱导边界迁移（SIBM）机制促进再结晶，从铸态柱状{100}晶粒中保留非晶粒取向（NGO）电工钢的首选{100}纤维织构的可行性。在最终退火之前进行中间退火阶段的轧制用于在最终再结晶步骤之前通过恢复来减少储存的能量。在样品中观察到强的{100}纤维再结晶织构，即面积分数为32%，该样品经5个中间退火阶段热变形至1.6应变，然后在950°C下退火5分钟（以观察再结晶的早期阶段）或1小时。而在单一退火阶段或无中间退火阶段的 1.2 应变后，仅观察到 12 - 14% {100} 纤维成分。研究发现，由于SIBM再结晶机制，在具有{100}纤维织构的母体变形晶粒附近的区域中形成了{100}纤维再结晶织构。 EBSD 成像分析用于跟踪同一微观结构区域中使用间断热处理的再结晶过程，可以看出，{100} 织构晶粒在变形后携带非常低的存储能量，这意味着这些晶粒中的亚晶粒膨胀到具有较高存储能量的周围晶粒中。由于其重结晶成核速率慢，因此优选较低的总存储能量来促进通过 SIBM 再结晶机制形成 {100} 织构的重结晶晶粒。
In this paper, the feasibility of retaining the preferred {100} fibre texture for non-grain oriented (NGO) electrical steel from the as-cast columnar {100} grains by encouraging recrystallisation via the strain induced boundary migration (SIBM) mechanism was investigated. Rolling with intermediate annealing stages before the final anneal was used to reduce the stored energy through recovery before the final recrystallisation step. A strong {100} fibre recrystallisation texture, i.e. 32% area fraction, was seen in the sample which was warm deformed to 1.6 strain with 5 intermediate annealing stages then annealed at 950 °C for 5 minutes (to observe the early stages of recrystallisation) or 1 hour. Whereas only 12 - 14% {100} fibre component was observed after 1.2 strain with a single or with no intermediate annealing stage. It was found that the {100} fibre recrystallisation texture was formed in regions adjacent to parental deformed grains with {100} fibre texture due to the SIBM recrystallisation mechanism. EBSD imaging analysis was used to follow the recrystallisation process in the same microstructural region using interrupted heat treatments and it was seen that the {100} texture grains carried very low stored energy after deformation, which meant the subgrains in these grains bulged into the surrounding grains with higher stored energy. Due to its slow recrystallisation nucleation rate, a low overall stored energy is preferred to encourage {100} texture recrystallised grains to form via the SIBM recrystallisation mechanism.