Study of grain refinement of Ti6Al4V alloy after aging, annealing and tempering heat treatment
DOI:
https://doi.org/10.63103/k73agx12Keywords:
Titanium, Microstructure, Heat treatmentAbstract
Heat treatment of titanium alloys, such as Ti-6Al-4V, is essential to adjust their mechanical and microstructural properties. Thus, heat treatments are essential to improve the properties of titanium alloys. This work aimed to investigate and characterize the effect of aging, annealing and tempering heat treatments on the grain refinement of Ti6Al4V alloy. Through aging, annealing and tempering heat treatment, the microstructure and hardness of 7 samples were analyzed. The analyzed samples were prepared for micrograph and microhardness analysis through metallographic technique after heat treatment. Their microstructures and microhardness were analyzed through optical microscopy and Vickers microhardness test. This research found a phase transition occurred above the β-transus temperature (1050°C) that resulted in two microstructures: martensite and widmanstätten, with sudden cooling and slow cooling respectively. Three more samples were heated below the β-transus temperature (550°C, 650°C and 750°C) and cooled to room temperature after solution treatment, which resulted in a bimodal microstructure. There was a considerable increase in microhardness in relation to the base sample, with a decrease only in the bimodal structure after 650°C due to overaging. The results for the microstructure varied according to the heat treatment. Different structures could be evaluated, obtaining the widmanstätten, martensite and bimodal structures. It was found that the modification in the microstructure of the Ti-6Al-4V alloy influences the microhardness in a specific way for each treatment performed.
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