Strength and Toughness of Hot-Rolled TA15 Aviation Titanium Alloy after Heat Treatment

Abstract

To investigate the impact of various heat treatments on the strength and toughness of TA15 aviation titanium alloys, five different heat treatment methods were employed in the temperature range of 810–995 °C. The microstructure of the alloy was examined using a scanning electron microscope (SEM) and X-ray diffraction (XRD), and its mechanical properties were analyzed through tensile, hardness, impact, and bending tests. The findings indicate that increasing the annealing temperature results in an increase in the phase boundary and secondary α phase, while the volume fraction of the primary α phase decreases, leading to a rise in hardness and a decrease in elongation. The tensile strength of heat-treated samples at 810 °C was notably improved, displaying high ductility at this annealing temperature. Heat treatment (810 °C/2 h/WQ) produced the highest tensile properties (ultimate tensile strength, yield strength, and elongation of 987 MPa, 886 MPa, and 17.78%, respectively). Higher heat treatment temperatures were found to enhance hardness but decrease the tensile properties, bending strength, and impact toughness. The triple heat treatment (810 °C/1 h/AC + 810 °C/1 h/AC + 810 °C/1 h/AC) resulted in the highest hardness of 601.3 MPa. These results demonstrate that various heat treatments have a substantial impact on the strength and toughness of forged TA15 titanium alloys.

Microstructure and Properties in Metals and Alloys

“…L. Li et al [9] investigate the impact of various heat treatments on the strength and toughness of TA15 aviation titanium alloys. Five different heat treatment methods were employed in the temperature range of 810-995 • C. The microstructure of the alloy was examined using a scanning electron microscope (SEM) and X-ray diffraction (XRD), and its mechanical properties were analyzed through tensile, hardness, impact, and bending tests.…”

Microstructural Evolution and Mechanical Behavior of TA15 Titanium Alloy Fabricated by Selective Laser Melting: Influence of Solution Treatment and Aging

“…Heat treatment can effectively improve the microstructure of titanium alloys and regulate their mechanical properties. Li et al [14] annealed the forged TA15 titanium alloy at 810 • C to 995 • C and found that the content of the primary α phase decreased while the content of the secondary α phase increased, resulting in a decrease in the plasticity of the specimen but an increase in the strength. Sun et al [15] performed a two-phase field heat treatment on a conventionally forged TA15 titanium alloy.…”

Uncertainty Assessment in Temperature Uniformity Survey of Thermal Processing Equipment According to AMS2750 Aerospace Specification

“…The most common materials are aluminium alloys, titanium alloys, steel, magnesium and composite materials [6][7][8]. The different materials require specific heat treatments that provide the necessary properties and characteristics to the different components to be assembled [9][10][11]. The heat treatments to be applied can be diverse, including solution, ageing, annealing, normalising, austenising, tempering, precipitation and stress relieving.…”