DC04钢冷轧退火过程中的组织及织构演变

Microstructure and texture evolution of DC04 steel during cold rolling and annealing process

采用光学显微镜观察及电子背散射衍射对DC04钢热轧卷取、冷轧、退火阶段的显微组织,钢板全厚度区域以及不同厚度层的织构类型及含量进行了分析。结果表明,热轧卷取样品各类型织构均较弱,{111}〈112〉、{111}〈110〉两种织构在不同厚度层含量变化不明显,而{112}〈110〉、{001}〈110〉两种织构的含量呈现由表层到中心方向递增趋势,且表层与中心织构含量差异明显。冷轧过程中,不同厚度层{112}〈110〉、{001}〈110〉两种织构含量的差异逐渐缩小。冷轧后,试验钢中{111}〈112〉、{111}〈110〉、{112}〈110〉、{001}〈110〉这4种织构均有所增强。退火过程中,试验钢中的{112}〈110〉、{001}〈110〉织构不断向{111}〈112〉、{111}〈110〉织构转化。退火后,{111}〈112〉、{111}〈110〉织构明显增强,各织构组分在不同厚度层的分布较为均匀。

Microstructure,texture type and content of DC04 steel at the stage of hot rolled coiling,cold rolling and annealing were investigated by using optical microscope and electron backscattered diffraction,which contained the whole thickness and the different depth zones of the steel sheets. The results show that all the types of texture are weak at the stage of hot rolled coiling. The texture content of { 111} 112 is almost equivalent to that of { 111} 110 in different thicknesses,while the contents of { 112} 110 and { 001} 110 are increased from surface to center,which shows significant differences. During the cold rolling process,the content differences of { 112} 110 and { 001} 110 gradually reduce. The intensity of four texture components of tested steel increases after cold rolling. The texture of tested steel transforms from { 112} 110 and { 001} 110 to { 111} 112 and { 111} 110 during annealing. The contents of { 111} 112 and { 111} 110 of tested steel increase obviously,while each texture component symmetrically distributes in different depth.