Forging of ultrafine grained commercial purity titanium orthopaedic implantsTuesday (05.11.2019) 15:20 - 15:40 Part of:
The increasing demand for advanced orthopaedic implants increases healthcare spending worldwide. One possible way of limiting this cost is through replacing titanium alloy Ti-6Al-4V ELI, often used for orthopaedic implants, with pure titanium, which is approximately 50% cheaper and more biocompatible because of the lack of harmful alloying elements. However, pure titanium has to be made stronger by refining its grain structure before it can be used in such applications.
Advanced Forming Research Centre, at University of Strathclyde in Glasgow, produced ultrafine grained commercial purity titanium while Orchid Orthopedic Solutions from Sheffield, forged it into a generic femoral stem implant. To assess feasibility of this approach, mechanical testing of commercial purity ultrafine grained titanium was carried out at three temperatures and three strain rates using a Gleeble testing machine. The material was also examined in terms of its structure produced during Gleeble testing. After forging, the femoral stem had lower tensile strength than Ti-6Al-4V ELI but identical high cycle fatigue strength. The proposed approach enables cost reduction realised through cheaper material, dramatically reduced forging temperature, longer tool life and avoiding chemical etching after forging.