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以含Nb细晶高强IF钢热轧板为研究对象,研究了冷轧压下率对实验钢冷轧织构以及再结晶织构形成影响。结果表明,退火后铁素体晶粒细化,强度提高。实验钢经冷轧后主要的织构为{112}<110>、{111}<112>、{111}<110>、{001}<110>,并且随冷轧压下率增加,织构组分无变化,各组分强度整体增加。再经退火后,在α线上织构减弱,甚至一些织构逐渐消失。提高冷轧压下率时,织构峰值逐渐由{001}<110>转为{111}<110>。对于γ取向线,峰值由{111}<110>取向变为{111}<112>取向,最终{111}<112>比{111}<110>取向强度大。实验钢再结晶机制由定向形核和选择生长共同作用的结果,并且随冷轧压下率增大,{111}面织构强度增大,所以r(塑性应变比)值增大,深冲性能提高。
The effect of cold rolling reduction on cold-rolled textures and recrystallized textures of cold-rolled Nb-containing high-strength IF steel was investigated. The results show that the ferrite grain refinement after annealing, the strength increased. The main textures of experimental steel after cold rolling were {112} <110>, {111} <112>, {111} <110> and {001} <110> No change in composition, the overall strength of the components increased. After annealing, the texture weakened in the α-line, and even some of the texture gradually disappeared. When the cold rolling reduction was increased, the texture peak gradually changed from {001} <110> to {111} <110>. For the γ-orientation line, the peak changes from the {111} <110> orientation to the {111} <112> orientation and the final {111} <112> orientation is greater than the {111} <110> orientation. The recrystallization mechanism of the experimental steel is a result of the combination of directional nucleation and selective growth. As the cold rolling reduction rate increases, the texture strength of the {111} plane increases, so the value of r (plastic strain ratio) increases. Improve performance.