Document Type : Original Research Article
Authors
1
Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran
2
, Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran. Iran
3
Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran.
4
, Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran.
10.22034/frj.2026.548798.1212
Abstract
Accurate determination of the beta transus temperature is essential for the appropriate design of thermomechanical and heat treatment processes, which directly influence the mechanical performance of titanium alloys. In the present work, the beta transus temperature of a near-alpha titanium alloy, Ti-811, was identified through detailed microstructural investigations. Samples were solution-treated at 1000, 1020, 1040, 1050, and 1060 °C for 1 h, followed by water quenching. Microstructural characterization was performed using optical microscopy and scanning electron microscopy. Metallographic analyses, aimed at determining the onset temperature of grain boundary alpha precipitation and tracking microstructural evolution during phase transformation, revealed the presence of secondary alpha and grain boundary alpha phases between 1000 and 1050 °C, consistent with the alloy’s dual-phase characteristics. In contrast, no secondary or grain boundary alpha phases were detected at 1060 °C, where the microstructure was fully composed of beta grains. Based on these observations, the beta transus temperature of Ti-811 alloy investigated in this study was determined to lie within the range of 1050–1060 °C.
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