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

Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (7): 869-875.DOI: 10.1007/s40195-018-0850-1

收稿日期:2018-08-16 修回日期:2018-09-22 接受日期:2018-11-22 出版日期:2018-11-22 发布日期:2019-06-20

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

Tao Sun¹(), Yan Liu^2,³, Shu-Jun Li³, Jian-Ping Li¹

1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
2. College of Mechanical Engineering, Shenyang University, Shenyang 110044, China
3. Titanium Alloy Laboratory, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2018-08-16 Revised:2018-09-22 Accepted:2018-11-22 Online:2018-11-22 Published:2019-06-20

摘要/Abstract

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

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

. [J]. Acta Metallurgica Sinica (English Letters), 2019, 32(7): 869-875.

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.

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

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