Abstract
The effect of hot deformation plus aging treatment on the microhardness of a solid solution TC18 titanium alloy is investigated. First, the microstructure evolution during hot deformation and aging treatment stages is analyzed. Additionally, the influence of deformation parameters on microstructure evolutions of the aged alloy is further studied. After aging treatment, the alloy exhibits a trimodal microstructure, which contributes to its excellent mechanical performance. Aging treatment significantly refines the microstructure, which is also influenced by deformation parameters. The microhardness variations at different stages are subsequently analyzed and how deformation conditions affect the microhardness of the aged alloy is examined. Aging treatment substantially enhances microhardness through the precipitation of acicular α phases. Deformation parameters also have a significant impact. A predictive model for the microhardness of the aged alloy is established using machine learning methods, achieving high accuracy. This research is significant for tailoring the desired microhardness of TC18 alloys during die forging and subsequent aging treatment.
Published Version
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