Mo, V, Zr, Cr, Fe, Al, Si and O were the principle determinants of beta transus. The 'r2' (92.0% vs. 90.7%) and mean predicted error [training (1.4% vs. 2.8%) and testing (2% vs. 2.4%)] pattern in ANN and MLR models suggest superior performance of ANN model. Multifactor ...
Beta21S and Beta21S-0.1B alloys were annealed above the beta transus temperature for different times to investigate the effect of boron on grain size stability.The TiB precipitates were very effective in restricting the beta grain boundary mobility by Zener pinning. A model has been developed ...
Beta titanium alloys were recognized as a distinct materials class in the 1950s, and following the introduction of Ti-13V-11Cr-3Al in the early 1960s, inte
The material used for this study is a b-forged Ti-6242 alloy. Forging, above b transus gives a purely lamellar microstructure with a mixture of Widmanstätten (Figure 1(a)) and basketweave zones, referred “Microstructure A” in Figure 2. Nevertheless, ...
transus isothermal forging of Ti–5Al–5Mo–5V–3Cr for three different starting microstructur es and pointed out that the initial flow behavior and the dominating deformation mechanis m de- pended on the morphology and volume fraction of a precipitates . ...
The microstructural evolution of titanium alloys during subtransus isothermal forging (IF) has been effectively demonstrated using a testing methodology developed at Imperial College London. Double truncated cone specimen geometries were isothermally deformed at near beta transus temperatures to obtain ...
Post-processing heat treatments are a useful tool to specifically tailor the microstructure and mechanical properties according to the application needs. In general, the most important factor to consider when heat treating the Ti-6Al-4V alloy is its β-transus temperature (Tβ), over which the ...
The β-transus temperatures of the three alloys were 840 °C, 810 °C and 830 °C, respectively. The specific composition of the alloys is shown in Table 1. Table 1. The composition of three alloys (wt%). The as-received ingots were machined into different shapes for compressive and ...
Though the TiB phase did not provide any additional nucleation sites for alpha precipitation, the grain refinement obtained by boron additions resulted in accelerated aging.;An investigation of the thermomechanical processing behavior showed different deformation mechanisms above the beta transus temperature...
The microstructures of the alloy solution treated at different temperatures are shown inFigure 2. The sample solution treated at 790 °C exhibited a typical microstructure of β grains with a small number of primary α because the solution temperature was below the β-transus temperature. The prim...