The Evolution of Seeding Technique for the Lamellar Orientation Controlling of γ-TiAl Based Alloys

doi:10.11900/0412.1961.2017.00516

Acta Metall Sin

2018, Vol. 54

Issue (5): 647-656 DOI: 10.11900/0412.1961.2017.00516

Special Issue for the Solidification of Metallic Materials

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The Evolution of Seeding Technique for the Lamellar Orientation Controlling of γ-TiAl Based Alloys

Yanqing SU(

), Tong LIU, Xinzhong LI, Ruirun CHEN, Jingjie GUO, Hengzhi FU

National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China

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Yanqing SU, Tong LIU, Xinzhong LI, Ruirun CHEN, Jingjie GUO, Hengzhi FU. The Evolution of Seeding Technique for the Lamellar Orientation Controlling of γ-TiAl Based Alloys. Acta Metall Sin, 2018, 54(5): 647-656.

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Abstract

TiAl-based alloys will be potentially used as light-weight high temperature structural materials in aerospace industry. The comprehensive mechanical properties of TiAl-based alloys can be improved significantly when lamellar orientation is aligned parallel to principle stress. In this paper, the development of seeding technique in directionally solidified TiAl-based alloys is reviewed, including the traditional Ti-43Al-3Si seeding method and some novel seeding methods. Those methods mainly include the second directional solidification method, self-seeding technique, quasi-seeding technique and high-melting metal seeding technique. Those newly developed methods will promote the engineering applications of the lamellar structure controlling technology for TiAl-based alloys. However, the stable growth of different leading phase in its designed direction depends on the coupling of the seed and growth dynamic parameteres. How to discover the influence of the growth dynamic parameteres on the designed growth direction is a key problem.

Key words: TiAl-based alloy directional solidification seeding technique lamellar orientation controlling

Received: 04 December 2017

ZTFLH:

TG146.23

Fund: Supported by National Natural Science Foundation of China (Nos.51425402 and 51331005), National Key Research and Development Program of China (No.2017YFA0403804) and Chang Jiang Scholars Program (No.T2014227)

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	Yanqing SU
	Tong LIU
	Xinzhong LI
	Ruirun CHEN
	Jingjie GUO
	Hengzhi FU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00516 OR https://www.ams.org.cn/EN/Y2018/V54/I5/647

Fig.1 Directional solidified ingot (a) and macrostructures (b) of Ti-47Al alloy obtained by electromagnetic confinement and directional solidification technology (EMCDS) at 10 μm/s with using Ti-43Al-3Si seed^[17]

Fig.2 Longitudinal microstructures of directionally solidified Ti-47Al ingot grown from a Ti-43Al-3Si seed at 36 mm/h^[20](a) more silicide particles existed in the initial part and the lamellar direction inclined small to the directional solidification (DS) direction
(b) silicides obviously decreased in transient part
(c) no silicide appeared in steady state growth stage and the lamellar direction exactly parallel to the DS direction

Fig.3 Microstructures of mush zone of Ti-43Al-3Si alloy after melting and thermal stabilization stage with the time of 0 min (a), 30 min (b) and 120 min (c)^[22]

Fig.4 Microstructure evolution along the growth direction of directionally solidified Ti-47Al-1.0W-0.5Si by Ti-43Al-3Si seeded at growth rate of 10 μm/s (a~d)^[22]

Fig.5 Macrostructures of the directionally solidified Ti-46Al-5Nb alloy after single (a) and double (b) DS processes at a growth rate of 30 μm/s (A—annealing region consisting of equiaxed grains, B—DS region in which columnar grain are found)^[26]

Fig.6 Schematic of growth mode for the Ti-46Al-5Nb alloy at the initial stage of the second DS step^[26]

Fig.7 Schematics of seed making by water cooling copper crucible^[29]
(a) before heating (b) while heating (c) after cooling (d) DS process

Fig.8 Macrostructures of the longitudinal section of the seeds (a) and the DS sample (b)^[30]

Fig.9 Schematics of preparing specimens for lamellar orientation control by self-seeding DS^[31](a) structures of master ingot (b) structures of seeding specimen (c) solidification processing

Fig.10 Microstructures of annealing region (a), initial interface (b) and DS region (c) of the EMCDS sample solidi?ed at 10 mm/s^[17]

Fig.11 TiAl binary phase diagram and the illustration of microstructure transformation upon rapid heating^[17]

Fig.12 Directional solidified ingot with indication of positions where composition transition zone and DS zone (a), and macrostructure of the transitional interface between seeding material and directionally solidified alloy (b)^[40]

Fig.13 Schematics of the β seeding technique in directionally solidified Ti-47Al-0.5W-0.5Si^[40]
(a) the formation of the composition transition zone
(b) the initial DS stage in composition transition zone
(c) the primary β dendrite is transformed peritectically into α grain
(d) the growth of α phase in steady-state growth region

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