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The Development of Recommendations for Machinability of Ti-6Al-4V Titanium Alloys by Optimizing the Heat Treatment Modes


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DOI: https://doi.org/10.15866/ireme.v12i9.15593

Abstract


The results of the studies for the effect of various forging temperatures and heat treatment modes on the structure, phase composition, mechanical properties and machinability of the α+β-titanium alloy Ti-6Al-4V are generalized. This paper denotes that forging and heat treatment are an effective means of providing different levels of mechanical properties of alloys and defining their various machinability. After forging at different temperatures, higher machinability is observed for samples with a fine structure formed during the deformation process in the α+β region at 9500С. The formation of a coarse-grained lamellar structure in the forging process at high temperatures in the β-region leads to a deterioration in machinability. It is shown that the highest machinability characteristics of cutting have been found after quenching from critical temperatures (~875oC), when the maximum amount of metastable β-phase is formed. After quenching and aging, the machinability of the Ti-6Al-4V alloy is generally worse than after forging and quenching. Based on the research it has been found that in the heat-strengthened state, machinability is improved with an increase in the temperature of heating for quenching from 700 to 900 °С, an aging temperature from 400 to 600 °С, a reduction in the duration of aging from 6 to 1 hour, and a decrease in the size of β-grain. Taking into account the requirements of normative documentation for heat treatment of semi-finished products from Ti-6Al-4V alloy, it is advisable to carry out rough machining after quenching from temperatures of 880-900 °С, and finishing – after aging at 550 °C, 2 hour.
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Keywords


Titanium Alloys; Forging; Heat Treatment; Structure; Mechanical Properties; Machinability

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