Influence of Duplex Annealing on the Microstructure and Mechanical Properties of Ti62421S Titanium Alloy Plate

Abstract:

The effects of different duplex annealing treatments on the microstructure and mechanical properties of Ti62421S alloy plate were studied by optical microscope (OM), scanning electron microscope (SEM), electron probe microanalysis (EPMA) and tensile tests, The experimental results indicated that the original microstructure of Ti62421S was composed of primary α phase (α_p) and intergranular β phase. With the increase of first-stage annealing temperature, the volume fraction of equiaxed α_p phase decreased. In contrast, the content of transformed β structure (β_t) increased, and the width of lamellar secondary α phase (α_s) in β_t increased. Consequently, the yield strength (σ_0.2) and ultimate tensile strength (σ_b) at room temperature and 600°C increased, while the elongation (δ₅) declined. After 1000°C/2h/AC+ 600°C/2h/AC duplex annealing treatment, Ti62421S alloy plate showed superior tensile properties. The values of σ_b and δ₅ at room temperature reached 1133MPa and 6%, as well as the value of σ_b at 600°C exceeded 710MPa.

• Periodical: Materials Science Forum (Volume 816)
• Pages: 804-809
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.816.804
• Online since: April 2015
• Authors: Xiao Yun Song*, Yong Ling Wang, Wen Jing Zhang, Song Xiao Hui, Wen Jun Ye
• Keywords: Duplex annealing, High-Temperature Titanium Alloy, Mechanical Properties, Microstructure, Ti62421S Alloy

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