Research Progress on Additive Manufacturing TiAl Alloy

doi:10.11900/0412.1961.2022.00582

Acta Metall Sin

2024, Vol. 60

Issue (1): 1-15 DOI: 10.11900/0412.1961.2022.00582

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Research Progress on Additive Manufacturing TiAl Alloy

CHEN Yuyong¹^,²(

), SHI Guohao¹^,², DU Zhiming², ZHANG Yu¹^,², CHANG Shuai¹

1 State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
2 National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China

Cite this article:

CHEN Yuyong, SHI Guohao, DU Zhiming, ZHANG Yu, CHANG Shuai. Research Progress on Additive Manufacturing TiAl Alloy. Acta Metall Sin, 2024, 60(1): 1-15.

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Abstract

One of the most promising high-temperature structural materials in aerospace and civil industries is the lightweight and heat-resistant TiAl alloys. However, owing to their low ductility and fracture toughness, manufacturing TiAl parts is challenging. At present, additive manufacturing process is considered one of the most promising technologies for manufacturing TiAl parts. Based on the principles and characteristics of additive manufacturing technology, this paper summarizes the process-structure-property relation of laser metal deposition (LMD), selective laser melting (SLM), and electron beam melting (EBM) in the preparation of TiAl alloy. Furthermore, this paper discusses the future development trends of additive manufacturing technology.

Key words: TiAl alloy laser metal deposition selective laser melting electron beam melting

Received: 10 November 2022

ZTFLH:

TG146.23

Fund: National Key Research and Development Project of China(2017YFE0123500)

Corresponding Authors: CHEN Yuyong, professor, Tel: (0451)86418802, E-mail: yychen@hit.edu.cn

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	CHEN Yuyong
	SHI Guohao
	DU Zhiming
	ZHANG Yu
	CHANG Shuai

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https://www.ams.org.cn/EN/10.11900/0412.1961.2022.00582 OR https://www.ams.org.cn/EN/Y2024/V60/I1/1

Fig.1 Schematics of laser metal deposition (LMD) process^[11] (a) and powder bed fusion (PBF) technology^[8] (b)

Table 1 Comparisons of additive manufacturing techniques^[8-11]

Table 2 Optimal process conditions for the manufacture of Ti-47Al-2Cr-2Nb by LMD^[14]

Fig.2 SEM-BSE image of laser deposited Ti-48Al-2Cr-2Nb alloy^[22]

Fig.3 SEM images of Ti-47Al-2Cr-2Nb alloy^[14](a) as-built
(b) after heat treatment of 4 h at 1250^oC followed by 4 h at 900^oC

Table 3 Room temperature tensile properties of Ti-47Al-2Cr-2Nb alloy under different loading directions^[31]

Fig.4 Crack densities and porosities of Ti-40Al-9V-0.5Y alloy processed by SLM at different scanning speeds^[51]

Fig.5 SEM images of the SLM manufactured TNM-B1 sample^[52,53]
(a) as-build
(b) 1230^oC, 1 h, AC + 900^oC, 6 h, FC heat treated (View is perpendicular to the building direc-tion)

Fig.6 Typical SEM images of TNB-V4 samples produced at volumetric energy levels of 300 J/mm³ (a), 110 J/mm³ (b), and 60 J/mm³(c)^[47]

Fig.7 OM image of EBM Ti-48Al-2Cr-2Nb alloy^[73]

Fig.8 Tensile properties of EBM Ti-48Al-2Cr-2Nb alloy subjected to heat treatment (HIP—hot isostatic pressing, DP—duplex, FL—fully lamellar)^[82]
(a) yield strength (R_p0.2) (b) elongation (A) (Inset shows the locally enlarged curve)
(c) ultimate strength (R_m) (d) stress-strain curves at room temperature

Table 4 Summaries of notch toughness and fatigue crack growth results for EBM Ti-48Al-2Cr-2Nb alloy^[67]

Fig.9 TiAl turbo blade fabricated using EBM technique by Avio Aero^[90] (These arcam EBM machines use a powerful 3-kilowatt electron beam to melt the final grains of TiAl powders to build 40 cm long blades)

Fig.10 EBM Ti-48Al-2Cr-2Nb honeycomb made at AVIC Manufacturing Technology Institute^[4]

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