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<p>Ti-6Al-4V and Ti-6Al-7Nb alloys were melted by an electric arc furnace, followed by tailored heat treatment routes in this study. The temperatures and cooling rates factors affecting the microstructural evolution, phase content and texture, and mechanical properties were evaluated. Thus far, the relationship between microstructure features, surface texture, and corresponding properties of as-cast and thermally treated alloys has not been completely understood. The results of this study revealed that the cooling rate and treatment temperatures significantly affect the properties and amount of phase transformation. Moreover, an approach utilizing bearing area curves (BAC) called Abbott Firestone curves were used to relate the surface texture to the phase content. Among the Ti67 alloys investigated, treatment at 1070&#xa0;°C for 1 hour and water quenching followed by aging at 550&#xa0;°C for 4&#xa0;h followed by furnace cooling to 200&#xa0;°C, then air cooling to room temperature exhibited the highest ultimate compressive strength (1423.7 MPa), consisting of ω phase along with <i>α</i> and <i>β</i> phases due to the precipitation hardening mechanism.</p> Graphical Abstract <p></p>

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Studying the Behavior of Cast and Thermally Treated α + β -Titanium Alloys Using the Abbott Firestone Technique

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月22日

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  • Ahmed H. Awad,
  • Ayman Elsayed,
  • Ahmed I. Z. Farahat,
  • Shimaa El-Hadad

摘要

Ti-6Al-4V and Ti-6Al-7Nb alloys were melted by an electric arc furnace, followed by tailored heat treatment routes in this study. The temperatures and cooling rates factors affecting the microstructural evolution, phase content and texture, and mechanical properties were evaluated. Thus far, the relationship between microstructure features, surface texture, and corresponding properties of as-cast and thermally treated alloys has not been completely understood. The results of this study revealed that the cooling rate and treatment temperatures significantly affect the properties and amount of phase transformation. Moreover, an approach utilizing bearing area curves (BAC) called Abbott Firestone curves were used to relate the surface texture to the phase content. Among the Ti67 alloys investigated, treatment at 1070 °C for 1 hour and water quenching followed by aging at 550 °C for 4 h followed by furnace cooling to 200 °C, then air cooling to room temperature exhibited the highest ultimate compressive strength (1423.7 MPa), consisting of ω phase along with α and β phases due to the precipitation hardening mechanism.

Graphical Abstract