Ti6321合金丝成形过程中组织结构和性能演变研究

Variation of Microstructure and Mechanical Properties of Ti6321 Alloy Wire duringthe forming process

摘要:

采用孔模热拉拔工艺制备Ti6321合金Ф2.9mm丝材,研究了丝材成形过程中组织结构和力学性能的演变规律。研究结果表明,初生α相平均晶粒尺寸由10.5μm减小至2.1μm左右,微观组织得了显著的细化,抗拉强度由1035MPa提高至1250MPa。采用扫描电镜观察了丝材的拉伸断口,为典型的韧性断裂。并采用EBSD研究了丝材内部织构,存在(0001)⊥轴向织构和{0001}<10-10>织构,晶粒细化和织构是造成丝材强化的主要原因。

Abstract:

Ti6321 alloy wire with a diameter of Ф2.9mm was produced by hole die drawing process, and the evolution of microstructure and mechanical properties in the forming process of Ti6321 alloy wire was studied in the paper. The results show that the average grain size of primary α phase decreases from 10.5μm to about 2.1μm, and the tensile strength increased from 1035MPa to 1250MPa. The tensile fracture surface with a typical ductile fracture of the wire was observed by scanning electron microscope,. And the texture in the wire was analyzed by EBSD, and found that there are (0001) ⊥ axial texture and {0001} <10-10> texture. It can be concluded that grain refinement and texture are the main cause for wire reinforcement.