Abstract
The phase transformation and dilatometric curves in Fe microalloyed Ti6Al4V alloy (Ti6Al4V-Fe) during continuous heating at 1 ℃ /min heating rate had been studied by dilatometer and metallographic methods, and β phase transition temperatures of alloy were obtained. In order to validate the accuracy of these β phase transition temperature and microstructure evolution, the relative phase concentration and the evolution of microstructure which were acquired by cooling after tempering were analyzed by metallographic microscope. The results illuminated that the expansion method was able to accurately measure the β transformation temperature of Ti6Al4V-Fe alloy. The lathy-shaped α phase decreased significantly disappeared in the range of 838℃ to 988℃, and the α→β phase transformation occurred.
Highlights
Ti6Al4V titanium alloy is one kind of attractive material for aerospace applications because of its high strength-to-density ratio, good hardenability and cold formability, excellent fatigue/crack propagation, and corrosion resistance [1]
Along with the temperature increases, the alloy expansion rate was approximate to linear when the temperature is less than 838°C, and there was a slight increase in the dilatation law from 838 to 988°C (TA to TB), which is caused by α→β phase transformation
It can be concluded that, with the temperature of the Ti6Al4V-Fe alloy rises, a α→β phase transition occurs in the temperature range of 838-988 °C, it can be said that the transformation is basically completed when the temperature reaches 988°C and the corresponding temperature can be considered as β phase transition temperature
Summary
Ti6Al4V titanium alloy is one kind of attractive material for aerospace applications because of its high strength-to-density ratio, good hardenability and cold formability, excellent fatigue/crack propagation, and corrosion resistance [1]. With the increasing of the concentration of Fe in titanium alloy, the flow stress and deformation resistance drop significantly and increase the alloy’s working suitability and lower the cost. This interesting result can cut the titanium alloy’s working budget and is of great significance for the development of low-cost and high performance Ti6Al4V-Fe alloys. The morphology and volume fraction of α precipitates, which signi cantly affect mechanical properties, are related to phase transformation of alloys.More scholars have adjusted and controlled α phase structure of α+β titanium alloys such as Ti6Al4V, TC11(Ti-6.5Al-3.5Mo-1.5Zr0.3Si) and TC18(Ti-5Al-5V-5Mo1Cr-1Fe) by heat treatment, and obtained good matching of alloy strength and plasticity [4,5,6]. Dilatometry method was used to study the α→β phase transformation of Ti6Al4V-Fe titanium alloy during continuous heating, β phase transition temperature of Ti6Al4V-Fe alloy was obtained
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