Abstract
AbstractThe solution-aging treatment parameters, including solution temperature, cooling rate and aging temperature, have significant influences on the microstructures and comprehensive mechanical properties of titanium alloy. In this work, the detailed microevolution behaviors of Ti–10V–2Fe–3Al alloy under different solution and aging conditions have been investigated through a series of heat-treatment experiments. The results of solution-treatment experiments reveal that the content of αp-phase is reduced to zero as the solution temperature is raised to a certain α → β critical transformation point. Recrystallized β-grains can be observed at the solution temperature of 820°C. In addition, the cooling way (air cooling or water cooling) has little influence on the microevolution behaviors for this alloy during the solution-treatment process. As for the solution-aging-treatment experiments, the results reveal that αs-phases are precipitated from the supersaturated β-phase, and the fraction of αs-phase increases with increasing aging temperature. However, the precipitated α-grains intend to coalesce and coarsen as the aging temperature raises above 510°C. Therefore, the advocated solution-aging-treatment program is solution treatment at 820°C with air cooling followed by aging treatment at 510°C with air cooling.
Highlights
Titanium and its alloys have been extensively applied in aeronautics, astronautics and marine industry due to their excellent fracture toughness, good corrosion resistance and high strength-to-weight ratio [1,2]
The advocated solution-aging-treatment program is solution treatment at 820°C with air cooling followed by aging treatment at 510°C with air cooling
As the solution temperature is raised to 760°C, most of the lamellar αpphases are dissolved into the β-phase, and some newly formed αGB phases appear around the primary β-grain boundaries, which infers that basket-weave αp-phases are more stable than lamellar αp-phases
Summary
Titanium and its alloys have been extensively applied in aeronautics, astronautics and marine industry due to their excellent fracture toughness, good corrosion resistance and high strength-to-weight ratio [1,2]. The mechanical performance of titanium alloy components mainly depends on their microstructure features. The desired combination of mechanical properties of titanium alloys can be obtained through adjusting the microstructures by means of suitable heat treatment processes such as solution-aging treatments [3,4], annealing treatments [5,6], etc. Many researches have paid attention to the heat treatment process of titanium alloy. Qiang et al [8] have obtained the nanoscaled lamellar structure in an as-cast titanium alloy by the multistep heat treatment method. Most researches only focused on the microevolution of single phase (α-phase or β-phase) during the heat treatment process of titanium alloy.
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