Crystal Plasticity Finite Element Method Investigation of the High Temperature Deformation Consistency in Dual-Phase Titanium Alloy

doi:10.11900/0412.1961.2018.00380

Acta Metall Sin

2019, Vol. 55

Issue (7): 928-938 DOI: 10.11900/0412.1961.2018.00380

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Crystal Plasticity Finite Element Method Investigation of the High Temperature Deformation Consistency in Dual-Phase Titanium Alloy

Xuexiong LI^1,²,Dongsheng XU¹(

),Rui YANG¹

1. Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, China
2. University of Chinese Academy of Sciences, Beijing 100049, China

Cite this article:

Xuexiong LI,Dongsheng XU,Rui YANG. Crystal Plasticity Finite Element Method Investigation of the High Temperature Deformation Consistency in Dual-Phase Titanium Alloy. Acta Metall Sin, 2019, 55(7): 928-938.

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Abstract

Based on the rate-dependent crystal plasticity constitutive model considering all slip systems, a series of dual-phase polycrystalline models were established using 3D Voronoi tessellation to investigate the high temperature plastic deformation of Ti-6Al-4V alloy with different microstructure features. The spatial distributions and evolution of stress and strain in various grains and phases were calculated in detail, and a new method was proposed to evaluate quantitatively the deformation consistency in the alloy with two phases. Simulations show that grain boundary region responds preferentially in the early stage of deformation. The encircling structure formed between β and α grains can enhance the differences in the local strain distribution. Increasing the aspect ratio of grains and the fractions of heterogeneous phase interface can reduce the local compatibility of deformation. The stress frequency statistics of both α and β phases show a double peak form, with α phase higher in average strain, and β phase higher in stress distribution. Increasing of the volume fractions of α phase may reduce the tensile yield strength, and cause the stress consistency coefficient to decrease, while the strain consistency coefficient decreases first and then increases. As initial α-basal texture intensity increases, both tensile yield strength and stress consistency coefficient increase, while the strain consistency coefficient decreases first and then increases.

Key words: dual-phase titanium alloy Voronoi crystal plasticity finite element method (CPFEM) distribution of micro stress and strain deformation compatibility

Received: 17 August 2018

ZTFLH:

TG113.25

Fund: National Key Research and Development Program of China(No.2016YFB0701304);Informatization Program of the Chinese Academy of Sciences(No.XXH13506-3040);Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDC01040100)

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00380 OR https://www.ams.org.cn/EN/Y2019/V55/I7/928

Fig.1 Grains and phase distribution in dual-phase polycrystalline titanium alloy

Phase	Slip system type	$γ ˙ 0$	n	q	h₀ / MPa	τ₀ / MPa	τ_s / MPa
α-Ti	<a>	0.001	6.25	1	120.0	8.2	18.0
α-Ti	<c+a>	0.001	6.25	1	120.0	82.0	180.0
β-Ti		0.001	12.5	1	143.1	84.3	96.5

Table 1 Crystal plasticity constitutive parameters of Ti-6Al-4V at 750 ℃^{[24,25,26,27]}

Fig.2 Polycrystalline microstructures and contour maps of dual-phase titanium alloy after high temperature tensile deformation at 750 ℃ (Fig.2c1 has the same legend of Mises stress with Figs.2a1~a3, Fig.2c2 has the same legend of true strain with Figs.2b1~b3. ○□◇▽ mark the grains in specific region in microstructure)

Fig.3 Contour maps of a group of three grains after high temperature tensile deformation at 750 ℃

Fig.4 Statistics of true strain in selected grains after 20% high temperature tension at 750 ℃(a) average true strain (b) total true strain

Fig.5 Frequency distributions of Mises stress (a) and true strain (b) in the dual-phase titanium alloy

Fig.6 High temperature (750 ℃) tensile stress-strain curves for dual-phase titanium alloys with different volume fractions of α phase

Fig.7 Average true strain, average Mises stress and consistency coefficient for polycrystal with different α fractions at 750 ℃ and 20% elongation

Fig.8 High temperature (750 ℃) tensile stress-strain curves for dual-phase titanium alloy (50%α) with different volume fractions of basal-α texture

Fig.9 Effects of volume fraction of basal-α texture on average true strain, average Mises stress and consistency coefficient for dual-phase titanium alloy with 50%α at 750 ℃ and 20% enlongation

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LIANG Wei; YANG Dezhuang( Centre of Testing and Measuring; Taiyuan University of Technologyl Taiyuan 030024)( Harbin Institute of Technology; Harbin 150001)Comspondent: LIANG Wei; prodessor Tel: (0351)6010610 Fax: (0351)6041237. GEOMETRICAL ANALYSIS ON PLASTIC DEFORMATION OF POLYCRYSTALLINE METALS AND THE ROOM TEMPERATURE PLASTICITY OF TOW-PHASE TiAl-BASE ALLOYS[J]. 金属学报, 1998, 34(6): 597-602.

[2]

LIANG Wei;YANG Dezhuang (Harbin institute of Technology; Harbin 150001) (Taiyuan University ofTechnology; Taiyuan 030024). MECHANISMS OF COMPATIBLE PLASTIC DEFORMATION BETWEEN THE γ-LAMELLAE IN TWO PHASE TiAl-BASE ALLOY[J]. 金属学报, 1997, 33(7): 690-696.

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