轴向取向组织BFe10-1-1管材冷轧加工过程中组织、织构与力学性能的变化  

Evolution of microstructure,texture and mechanical properties of BFe10-1-1 tube with microstructure along axial orientation during cold-rolling

作　　者：梅俊[1,2] 刘新华[1,2] 姜雁斌[1,2] 谢建新[1,2] 

机构地区：[1]北京科技大学材料先进制备技术教育部重点实验室,北京100083 [2]北京科技大学新材料技术研究院,北京100083

出　　处：《中国有色金属学报》2012年第9期2529-2538,共10页The Chinese Journal of Nonferrous Metals

基　　金：国家"十二五"科技支撑计划资助项目(2011BAE23B00)

摘　　要：采用热冷组合铸型（HCCM）水平连铸技术制备具有轴向取向组织的BFe10-1-1管材，对管材进行冷轧加工，研究管材的组织、织构与性能的变化。结果表明：HCCM水平连铸管材不需铣面便可直接冷轧加工；无中间退火的累积冷轧变形量可达80％以上；冷轧管表面质量好，轧制过程中无裂纹、裂口和飞边等缺陷；随着变形量的增加，取向组织晶粒内一次枝晶主干间距逐渐减小，由铸态的100-200μm减小到变形量60％时的10-20μm；当冷变形量为60％时，组织中可观察到剪切带，当冷变形量为80％时，组织呈波浪状，枝晶、晶界很难辨认；冷轧过程中管材由铸造织构（主要取向{012}（621））、经过渡型织构{012}（100）（变形量为20％）和{057}〈372〉（变形量为40％），转变为变形量为60％时的Cube织构，当变形量为80％时转变为G织构；随着变形量的增加，冷轧管的抗拉强度和硬度分别由铸态的234MPa和70HV增加至变形量80％时的372UPa和152HV，伸长率由铸态的46．5％降低至80％变形量时的13％。BFe10-1-1 cupronickel tubes with the microstructure along axial orientation were fabricated by a heating-cooling combined mold （HCCM） technology. The tubes were cold-rolled to study the evolution of microstructure, texture and mechanical properties during cold rolling. The results show that the tubes produced by the HCCM can be directly used for subsequent cold rolling without surface milling and the accumulated cold-rolling deformation approaches to 80% without intermediate annealing. The cold-rolled tubes have good surface quality without defects of crack, breach and flash. The primary dendrite arm space in the oriented grains decreases gradually with an increase in the deformation, i.e. 100-200 pm of the casting tube is decreased to 10-20 pm of the tube with 80% deformation. When the deformation reaches 60%, the shear band can be observed, and when the deformation reaches 80%, the grain is of a wavy-structure, and the dendrite and grain boundary are difficult to be identified. During cold rolling, the cast texture ofthe casting tube （main orientation{012}（ 621 ）） transforms into Cube texture after 60% deformation and into G texture after 80% deformation, through the transition type textures of {012}（100） （20% deformation） and {057}（ 372 ） （40% deformation）. With increasing the deformation, the tensile strength （243 MPa） and hardness （70HV） of the casting tube are increased to 372 MPa and 152HV of the tube with 80% deformation, respectively, while the elongation （46.5%） of the casting tube is reduced to 13% of the tube with 80% deformation.

关 键 词：BFe10合金 水平连铸 热冷组合铸型 冷轧管 轧制织构 

分 类 号：TG146.1[一般工业技术—材料科学与工程] TG335.1[金属学及工艺—金属材料]