S. Tamirisa, FMW Composite Systems Inc., Bridgeport, WV; D. B. Miracle, V. Sinha, Air Force Research Laboratory, Wright-Patterson AFB, OH; R. Srinivasan, Wright State University, Dayton, OH
Small additions of boron (£1 wt %) to titanium alloys provide important benefits. These boron additions result in dramatically finer grain sizes in the as-cast condition. In addition, grain growth is inhibited, even above the beta transus. Together, these features offer the potential to develop disruptive thermo-mechanical processing paths for titanium. The finer grain size improves hot workability, and inhibited grain growth above the beta transus may open up the processing window, enabling higher deformation rates and lower press forces. The boron is essentially insoluble in titanium and precipitates as fine (~1 mm diameter) TiB whiskers that increase the strength and stiffness by up to 30% while retaining acceptable tensile ductility, fracture toughness, and fatigue properties. A current overview of the progress achieved toward establishing thermo-mechanical processes and applications of boron-modified titanium alloys will be presented.
Summary: Small additions of boron („T1 wt %) to titanium alloys provide important benefits. These boron additions result in dramatically finer grain sizes in the as-cast condition. In addition, grain growth is inhibited, even above the beta transus. Together, these features offer the potential to develop disruptive thermo-mechanical processing paths for titanium. The finer grain size improves hot workability, and inhibited grain growth above the beta transus may open up the processing window, enabling higher deformation rates and lower press forces. The boron is essentially insoluble in titanium and precipitates as fine (~1 ƒÝm diameter) TiB whiskers that increase the strength and stiffness by up to 30% while retaining acceptable tensile ductility, fracture toughness, and fatigue properties. A current overview of the progress achieved toward establishing thermo-mechanical processes and applications of boron-modified titanium alloys will be presented.
