Research on the influence of aging treatment on the folding behavior and mechanical behavior of rolling silk in titanium alloy wire

As a critical component in the field of aerospace assembly, the mechanical and processing properties of titanium alloy wire are pivotal indicators determining the performance of fasteners. In this research, Ti6Al4V wire, post-drawing, was subjected to solution treatment at 960 ± 8°C for 1 hour, followed by aging treatments at 540°C, 560°C, 580°C, and 620°C. The microstructural characteristics and mechanical behavior of the wire post-heat treatment were thoroughly characterized. The findings revealed that the solution and aging treatments significantly enhanced the mechanical properties of the Ti6Al4V wire. Specifically, the tensile yield strength increased from 882 MPa to 1060 MPa, and the average axial compressive performance, Rpc0.2, improved from 859 MPa to 1020 MPa. It was observed that the resistance to thread fold formation, as well as the tensile and shear properties of the bolts, gradually declined with increasing aging temperatures. However, it was also noted that lower shear performance effectively mitigated the occurrence of rolling-induced folding defects during processing. The research demonstrated that an optimized heat treatment regimen can effectively address the issue of rolling-induced folding in titanium alloy wires, thereby enhancing the mechanical performance of fasteners.