Effect of HIP Treatment on Fatigue Crack Growth Behavior of Ti-6Al-4V Alloy Fabricated by Electron Beam Melting

doi:10.1007/s40195-017-0665-5

Abstract

Abstract:

The effect of hot isostatic pressing treatment on the fatigue crack growth behavior of Ti-6Al-4V alloy fabricated by electron beam melting was investigated. The results indicate that the fatigue crack growth rate of the HIPed samples is higher than that of the as-fabricated one under certain stress intensity factor (ΔK < 18 MPa m^1/2). With further increase in ΔK, the fatigue crack growth rates of the studied two samples become similar. The variation of α lamella thickness and the pore defects distribution have an effect on the fatigue crack growth rates in the studied samples, and the latter plays the dominant role.

Key words: Electron beam melting, Ti-6Al-4V, Fatigue crack growth rate, α;, Lamella, Pores

Yan Liu, Jun Zhang, Shu-Jun Li, Wen-Tao Hou, Hao Wang, Qin-Si Xu, Yu-Lin Hao, Rui Yang. Effect of HIP Treatment on Fatigue Crack Growth Behavior of Ti-6Al-4V Alloy Fabricated by Electron Beam Melting[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(12): 1163-1168.

Figures/Tables 8

Table 1 Chemical compositions of Ti-6Al-4V alloy powders used in this study (in wt%)

	Al	V	Ti	Fe	C	N	H	O
GB/T3620.1-1994	5.5-6.8	3.5-4.5	Balance	0.3	0.1	0.05	0.015	0.2
EBM powder	6.04	4.05	Balance	0.07	0.013	< 0.005	< 0.005	0.13

Fig. 1 Geometries of fatigue crack growth samples for EBM Ti-6Al-4V alloy in this investigation

Fig. 2 Optional microstructures of as-fabricated a, HIPed b heat treated c Ti-6Al-4V samples

Fig. 3 Micro-CT results of as-fabricated a, HIPed b, heat-treated c samples, and pore distribution d of the as-fabricated sample

Table 2 Tensile properties of the studied EBM Ti-6Al-4V samples

Conditions	UTS (MPa)	YS (MPa)	EL (%)	RA (%)
As-fabricated	1036 ± 5	955 ± 3	14.7 ± 0.6	42.6 ± 0.2
EBM + HIP	979 ± 2	887 ± 5	16.7 ± 0.5	51.7 ± 0.1
EBM + Heat treatment	930 ± 4	866 ± 7	18.2 ± 0.3	75.3 ± 0.1

Fig. 4 Fatigue crack growth curves of the studied EBM Ti-6Al-4V samples

Fig. 5 Fatigue crack propagation paths of as-fabricated a HIPed b samples

Fig. 6 SEM images of the fracture surfaces of the as-fabricated a, HIPed b heat-treated c samples

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