Quantitative Phase Field Simulation of α Particle Dissolution in Ti-6Al-4V Alloys Below β Transus Temperature

doi:10.1007/s40195-017-0562-y

Abstract

Abstract:

A quantitative phase field method of multi-component diffusion-controlled phase transformations coupled with the Kim-Kim-Suzuki model was applied to study the effect of initial particle size distribution (PSD) in 3D and space distribution in 2D on dissolution of α particles in Ti-6Al-4V alloy below β transus temperature in real time and length scale. The thermodynamic and mobility data were obtained from Thermo-Calc and DICTRA softwares, respectively. The results show that the volume fractions of α particles decay with time as: f=f_eq+（f_o-f_eq）exp（-Ktⁿ） for four cases of PSD. The sequence of dissolution kinetics from fast to slow is: uniform PSD, normal PSD, lognormal PSD and bimodal PSD. The space distribution is found to be a major factor affecting the dissolution kinetics and the microstructures. When the distance of the particles is less than critical value, the dissolution rates reduce with the decrease in distance. The Al and V concentration fields around the particles appear more obvious soft impingement.

Key words: Dissolution, Phase field model, Ti-6Al-4V, Initial PSD, Space distribution

Mei Yang, Gang Wang, Tao Liu, Wen-Juan Zhao, Dong-Sheng Xu. Quantitative Phase Field Simulation of α Particle Dissolution in Ti-6Al-4V Alloys Below β Transus Temperature[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(8): 745-752.

Figures/Tables 8

Fig. 1 Dissolution of α phase in PFM and DICTRA. a The dissolution kinetics, b evolution of concentration V, c evolution of concentration Al

Fig. 2 Initial PSD and microstructural evolution in the process of solution treatment with corresponding initial PSD in Ti-6Al-4V alloy: a, e, i uniform; b, f, j normal; c, g, k lognormal; d, h, l bimodal; initial PSD a-d; microstructure at 0 s e-h; microstructure at 1000 s i-l

Fig. 3 Evolution of concentration field Al a-d and V e-h in the middle cross section with initial lognormal PSD in Ti-6Al-4V alloy: a, e 0 s; b, f 500 s; c, g 1000 s; d, h 2000 s

Fig. 4 Temporal evolution of volume fraction of α particles with four initial PSD

Table 1 Values of K and n with different initial PSD

PSD	K	n
Uniform	0.0656	0.5617
Normal	0.0681	0.5195
Lognormal	0.0684	0.5120
Bimodal	0.0591	0.5046

Fig. 5 Temporal evolution of the average particle radius with four initial PSD

Fig. 6 Microstructure of two circular α particles in four cases of space distribution in the dissolution process: a, e 13.42 μm; b, f 4.48 μm c, g 2.24 μm; d, h 0 μm; a-d 0 s; e-h 1500 s

Fig. 7 Dissolution kinetic of two circular α particles in four cases of space distribution

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