Developing a phenomenological equation to predict yield strength from composition and microstructure in β processed Ti-6Al-4V

Abstract

A constituent-based phenomenological equation to predict yield strength values from quantified measurements of the microstructure and composition of β processed Ti-6Al-4V alloy was developed via the integration of artificial neural networks and genetic algorithms. It is shown that the solid solution strengthening contributes the most to the yield strength (~80% of the value), while the intrinsic yield strength of the two phases and microstructure have lower effects (~10% for both terms). Similarities and differences between the proposed equation and the previously established phenomenological equation for the yield strength prediction of the α+β processed Ti-6Al-4V alloys are discussed. While the two equations are very similar in terms of the intrinsic yield strength of the two constituent phases, the solid solution strengthening terms and the 'Hall-Petch'-like effect from the alpha lath, there is a pronounced difference in the role of the basketweave factor in strengthening. Finally, Monte Carlo simulations were applied to the proposed phenomenological equation to determine the effect of measurement uncertainties on the estimated yield strength values. AbstractA constituent-based phenomenological equation to predict yield strength values from quantified measurements of the microstructure and composition of β processed Ti-6Al-4V alloy was developed via the integration of artificial neural networks and genetic algorithms. It is shown that the solid solution strengthening contributes the most to the yield strength (~80% of the value), while the intrinsic yield strength of the two phases and microstructure have lower effects (~10% for both terms). Similarities and differences between the proposed equation and the previously established phenomenological equation for the yield strength prediction of the α+β processed Ti-6Al-4V alloys are discussed. While the two equations are very similar in terms of the intrinsic yield strength of the two constituent phases, the solid solution strengthening terms and the 'Hall-Petch'-like effect from the alpha lath, there is a pronounced difference in the role of the basketweave factor in strengthening. Finally, Monte Carlo simulations were applied to the Final document prior to publication in Materials Science and Engineering A Available at http://dx.doi.org/10:1016/j.msea.2016.02.052proposed phenomenological equation to determine the effect of measurement uncertainties on the estimated yield strength values.

Application of ASTAR/precession electron diffraction technique to quantitatively study defects in nanocrystalline metallic materials

“…). The effect of microstructure and chemical composition on the yield strength of Ti-6Al-4V alloy (which is an / titanium alloy) was investigated by an integration of artificial neural networks and genetic algorithms[161,162]. The results of this integration are in close agreement with the reported values by Williams et al[163].…”

“…38. Micrographs of (a) basketweave microstructure, (b) colony microstructure and (c) equiaxed alpha precipitates in a transformed beta matrix are presented (micrograph "b" belongs to ref [161]…”

Characterization of the near-surface nanocrystalline microstructure of ultrasonically treated Ti-6Al-4V using ASTAR™/precession electron diffraction technique

“…The surface-treated area can be studied more quantitatively by determining the dislocation density distributions of geometrically necessary dislocations [39,40] and disclinations [59], developing phenomenological equations to correlate microstructure and composition with the mechanical response (e.g., yield strength) [60,61] as well as investigating the microstructure and texture evolutions as a function of surface deformation (e.g., indentation) [62].…”

Microstructure, Texture Evolution and Mechanical Properties of VT3-1 Titanium Alloy Processed by Multi-Pass Drawing and Subsequent Isothermal Annealing

“…[4,14,33]. In order to test these effects, tensile properties (i.e., UTS: ultimate tensile strength, YS: yield strength, RA: reduction in area, and EL: elongation) for VT3-1 alloy in various states were evaluated.…”