Effect of hot rolling reduction on microstructure, texture and ductility of strip-cast grain-oriented silicon steel with different solidification structures
Effect of hot rolling reduction on microstructure, texture and ductility of strip-cast grain-oriented silicon steel with different solidification structures
复制标题
热轧压下量对不同凝固组织带铸取向硅钢组织、织构和塑性的影响
DOI：
10.1016/j.msea.2014.03.052
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发表时间：
2014-05-27
期刊：
影响因子：
6.4
通讯作者：
Wang, Guo-Dong
中科院分区：
文献类型：
--
作者：
Song, Hong-Yu;Liu, Hai-Tao;Wang, Guo-Dong
采用双辊薄带连铸工艺生产了铁素体平均晶粒尺寸为161 μ m和367 μ m的取向硅钢铸态薄带。然后将铸态带材再加热并以5- 50%的不同压下率进行热轧。采用光学显微镜、X射线衍射和电子背散射衍射等方法研究了合金的微观结构和织构演变。通过拉伸试验检测了热轧带钢的延伸率，并用扫描电镜观察了断口形貌。结果表明，两种铸态钢带的显微组织均由铁素体和马氏体组成。热轧后的组织均由铁素体和珠光体组成，且随热轧压下量的增加，组织逐渐细化，但初始凝固组织不同。在相同的热轧压下量下，热轧细晶带材的显微组织要细小得多，因此延伸率较高。细晶粒带材达到较好的塑性需要总压下量超过30%，而粗晶粒带材的总压下量高达50%。随着热轧压下量的增加，α和γ纤维织构逐渐增强，而初始{001} 0 vw纤维织构在所有热轧板中逐渐消失。尽管初始凝固组织不同，但仅在50%热轧带中形成了相对较强的戈斯织构，而50%热轧粗晶带显示出更强的戈斯织构。(C)2014爱思唯尔有限公司版权所有。
Grain-oriented silicon steel as-cast strips with the average ferrite grain sizes of 161 mu m and 367 mu m were produced by twin-roll strip casting. Then the as-cast strips were reheated and hot rolled with different reductions of 5-50%. The microstructure and texture evolution were investigated by optical microscopy, X-ray diffraction, and electron backscattered diffraction methods. The elongations of the hot rolled strips were examined by the tensile tests and the fracture surfaces were observed by scanning electron microscope. It was found that the microstructure of both as-cast strips consisted of ferrite and martensite. The microstructure of all the hot rolled strips was composed of ferrite and pearlite and it was gradually refined with increasing hot rolling reduction in spite of different initial solidification structures. The hot rolled fine-grained strips showed much finer microstructure at the same hot rolling reduction and thus gave rise to higher elongations. A total reduction of more than 30% was required for the fine-grained strips to achieve relatively good ductility, while that for the coarse-grained strips was as high as 50%. With increasing hot rolling reduction, alpha and gamma fibre textures were gradually enhanced at the expense of initial {001} 0vw fibre texture in all the hot rolled strips. Relatively strong Goss texture only evolved in the 50% hot rolled strips in spite of the different initial solidification structures, though the 50% hot rolled coarse-grained strip showed much stronger Goss texture. (C) 2014 Elsevier B.V. All rights reserved.