Effect of HIP Treatment on Fatigue Notch Sensitivity of Ti-6Al-4V Alloy Fabricated by Electron Beam Melting

doi:10.1007/s40195-018-0850-1

Abstract

Abstract:

The effect of hot isostatic pressing (HIP) treatment on the fatigue notch sensitivity of Ti-6Al-4V alloy fabricated by electron beam melting (EBM) was investigated. The results indicate that the fatigue notch sensitivity of the as-fabricated samples is much lower than that of HIPed samples. The variation of α lamella thickness and the distribution of pore defects have an effect on the fatigue strength in smooth and notched EBM Ti-6Al-4V samples, resulting in the divergence of the as-fabricated and HIPed samples on fatigue notch sensitivity.

Key words: Electron beam melting, Ti-6Al-4V, Fatigue notch sensitivity, α Lamella;, Pores

Tao Sun, Yan Liu, Shu-Jun Li, Jian-Ping Li. Effect of HIP Treatment on Fatigue Notch Sensitivity of Ti-6Al-4V Alloy Fabricated by Electron Beam Melting[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(7): 869-875.

Figures/Tables 11

Fig. 1 Morphology of Ti-6Al-4V ELI alloy powder

Table 1 Chemical compositions of Ti-6Al-4V alloy powder used in this study

Sample	Al	V	Ti	Fe	C	N	H	O
GB/T3620.1-1994	5.50-6.80	3.50-4.50	Bal.	0.300	0.100	0.050	0.015	0.20
EBM powder	6.04	4.05	Bal.	0.070	0.013	<?0.005	<?0.005	0.13

Fig. 2 Geometry and dimension of fatigue notch sample of Ti-6Al-4V fabricated by EBM

Fig. 3 Optical microstructures of as-fabricated a, HIPed b Ti-6Al-4V samples fabricated by electron beam melting

Fig. 4 TEM bright-field images a, dark-field images b, SAED pattern c of as-fabricated EBM Ti-6Al-4V

Fig. 5 Micro-CT results of as-fabricated a, HIPed b samples fabricated by EBM, pore distribution of as-fabricated sample c

Table 2 Tensile properties of EBM Ti-6Al-4V alloy

Material	UTS (MPa)	YS (MPa)	EL (%)	RA (%)
As-fabricated	1036?±?5	955?±?3	14.7?±?0.6	42.6?±?0.2
HIPed	979?±?2	887?±?5	16.7?±?0.5	51.7?±?0.1

Fig. 6 Maximum stress-number of cycles to failure (S-N) curves of as-fabricated and HIPed smooth EBM Ti-6Al-4V samples

Fig. 7 S-N curves of as-fabricated and HIPed notched EBM Ti-6Al-4V samples

Table 3 Fatigue notch sensitivities of EBM Ti-6Al-4V samples in different conditions

	Fatigue strength of smooth sample (MPa)	Fatigue strength of notched sample (MPa)	Fatigue notch sensitivity
As-fabricated	450	350	0.14
HIPed	550	300	0.42
Wrought [33]	550	280	0.48

Fig. 8 SEM images of fracture surfaces of as-fabricated a, c; HIPed b, d EBM Ti-6Al-4V samples at low a, b; high c, d magnification

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