Pure titanium components fabricated by casting have a coarse grain microstructure. To improve the mechanical strength of pure titanium components by refining the grain size, the cast samples were repeatedly heat-treated. During the heat treatment, the titanium samples were repeatedly heated above the alpha-to-beta (α–β) transition temperature and cooled to room temperature to undergo phase transformation. The heating cycle was performed 1, 3, 5, and 7 times. As the number of heating cycles increased, the grain size decreased. The tensile strength was 267.9 MPa in the as-cast sample and improved to 343.4 MPa after 7 heat-treatment cycles owing to the grain size refinement, while the elongation was maintained during the heat treatment.
This paper is part of a thematic issue on Titanium.
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