α+β钛合金热拉拔过程中的微观演变与力学性能  

Microscopic Evolution and Mechanical Properties of α+β Titanium Alloys During Hot Drawing

作　　者：关雨童 陈小红[1] GUAN Yu-tong;CHEN Xiao-hong(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学材料与化学学院,上海200093

出　　处：《广州化学》2023年第1期28-35,50,共9页Guangzhou Chemistry

摘　　要：轧制的Ti-6Al-4V棒材通过多道次拉拔工艺加工成Ti-6Al-4V线材,应用EBSD系统、扫描电子显微镜、能谱仪对其组织和结构分析,用拉伸试验机与显微硬度计进行力学性能分析,系统地研究了Ti-6Al-4V合金多道次拉拔过程中的微观组织演变特征与织构演变特征。结果表明,随着变形量的增大,拉长组织演变为细小均匀等轴组织,晶界完全破碎。材料韧性明显提高、塑性下降,表现于热拉后合金伸长率下降、断面收缩率升高。α相发展出<01 10>平行于拉拔方向的纤维织构,织构强度随着应变的增加而增加。The rolled Ti-6Al-4V rods were processed into Ti-6Al-4V wire rod by multi-pass drawing process, and then their organisation and structure were analysed by scanning electron microscope(SEM), electron diffraction backscattering technique(EBSD) and energy spectrometer, and their mechanical properties were analysed by tensile testing machine and micro hardness tester, and the multi-pass drawing process of Ti-6Al-4V alloy was systematically studied. The microstructural and structural characteristics of Ti-6Al-4V alloy during the multi-pass drawing process were systematically investigated. The results show that with increasing deformation, the elongated structure evolves into a fine and homogeneous equiaxial structure with complete breaking of grain boundaries. The tensile strength and elongation of the drawn material decreased, the section shrinkage increased,the plasticity decreased significantly and the toughness increased. α-Phase develops a fibrous weave<01 0>parallel to the drawing direction, and the weave strength increases with increasing strain.

关 键 词：Ti-6Al-4V线材 热处理 拉拔 显微组织 织构 

分 类 号：TB31[一般工业技术—材料科学与工程]