Abstract
Ti80 (Ti-6Al-3Nb-2Zr-1Mo) is a recently developed near-α titanium alloy that is generally applied in marine applications. In this study, the feasibility of producing the Ti80 alloy via the blended elemental powder metallurgy (BEPM) press-and-sinter method was demonstrated. Generally, the presence of elements with low diffusion mobility in titanium (Mo, Nb) creates difficulties with diffusion-controlled healing of the porosity and the realization of microstructural uniformity. These issues were minimized by using titanium hydride powder instead of titanium powder to activate the sintering, as well as by the proper selection of complex alloying powders rather than elemental powders to promote alloy uniformity. The time-temperature conditions to obtain a chemically and microstructurally homogeneous and nearly-dense alloy microstructure were determined. Special attention was given to the microstructural peculiarities of the sintered material to regulate its mechanical characteristics. Finally, the processing parameters were determined to reach the properties required by alloy specifications. This enabled both the fully beta transformed lamellar microstructure inherent to beta phase field sintering and one that could be modified via post sintering thermomechanical processing.
Highlights
The development of materials and corresponding manufacturing technologies for marine and aerospace applications has attracted growing attention
One of the titanium alloys used for marine application is Ti80 (Ti-6Al-3Nb-2Zr-1Mo, mass%), a new alloy developed in China, which shows a good combination of strength and weldability characteristics (Huang et al, 2011)
Coupled plasma (ICP) analysis of the sintered material revealed that its average chemical composition was comparable with the proportions expected for the Ti80 alloy (Table 2)
Summary
The development of materials and corresponding manufacturing technologies for marine and aerospace applications has attracted growing attention. Titanium alloys are widely used in notable applications because of their good corrosion resistance, high strength to weight ratio, and other well balanced mechanical characteristics. One of the titanium alloys used for marine application is Ti80 (Ti-6Al-3Nb-2Zr-1Mo, mass%), a new alloy developed in China, which shows a good combination of strength and weldability characteristics (Huang et al, 2011). Titanium products manufactured with traditional ingot metallurgy processing are generally at least 20 times more expensive than carbon steels and ∼4–5 times more expensive than stainless steels (Fang et al, 2017). The increased cost of titanium ingot metallurgy products is a result of the complicated processing required, which includes multi step vacuum remelting, hot deformation, and, machining with significant material waste.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
