Effect of Electromagnetic Field on Microstructure ofNi-Based Single Crystal Superalloys

doi:10.11900/0412.1961.2017.00539

Acta Metall Sin

2018, Vol. 54

Issue (10): 1428-1434 DOI: 10.11900/0412.1961.2017.00539

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Effect of Electromagnetic Field on Microstructure ofNi-Based Single Crystal Superalloys

Chenglin LIU, Haijun SU(

), Jun ZHANG, Taiwen HUANG, Lin LIU, Hengzhi FU

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

Cite this article:

Chenglin LIU, Haijun SU, Jun ZHANG, Taiwen HUANG, Lin LIU, Hengzhi FU. Effect of Electromagnetic Field on Microstructure ofNi-Based Single Crystal Superalloys. Acta Metall Sin, 2018, 54(10): 1428-1434.

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Abstract

With the increase of the alloying degree and structural complexity as well as larger size in Ni-based superalloy blades, it is essentially important to suppress the solidification defects. When the electromagnetic field is introduced into solidification process, the solidification properties of alloy can be modified without changing the alloy composition, which can well eliminate the casting defects, such as the composition segregation, and optimize the solidification microstructure and improve properties. The effect of induction coil magnetic field on solidification structure of DD90 single crystal superalloy is studied by changing the thickness of graphite sleeve. The distribution of magnetic field and flow field in alloy melt are analyzed by Ansys finite element analysis (FEM). The results show that when the thickness of the graphite sleeve is 10~30 mm, the monocrystalline remains intact and the primary dendrite arm spacing increases with increasing the thickness, while the second dendrites are the opposite rule. Moreover, the as-cast microstructures of γ′ phase size, eutectic structure and content increase significantly, and the element segregation increases simultaneously with increasing the graphite sleeve thickness. The Ansys FEM shows that the magnetic field and flow velocity in the melt decrease with the increase of the thickness of graphite sleeve. Based on the thermoelectric magnetic convection induced by the magnetic field during solidification and the effect of the convection on the microstructure, the above phenomenon is analyzed and discussed.

Key words: single crystal superalloy magnetic field flow field thermoelectric magnetic convection

Received: 15 December 2017

ZTFLH:

TG146.1

Fund: Supported by National Natural Science Foundation of China (Nos.51690163 and 51331005)

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	Chenglin LIU
	Haijun SU
	Jun ZHANG
	Taiwen HUANG
	Lin LIU
	Hengzhi FU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00539 OR https://www.ams.org.cn/EN/Y2018/V54/I10/1428

Fig.1 FEM model used in the simulation

Table 1 Material parameters for simulation

Fig.2 Transverse (a, c, e, g, i) and longitudinal (b, d, f, h, j) microstructures of DD90 superalloy with graphite sleeve thicknesses D=10 mm (a, b), 15 mm (c, d), 20 mm (e, f), 25 mm (g, h) and 30 mm (i, j)

Fig.3 The relationships between the primary (a) and secondary (b) dendrite arm spacing with the thickness of graphite

Fig.4 SEM images of γ′ phase in the dendrite core of DD90 superalloy with D=10 mm (a), 15 mm (b), 20 mm (c), 25 mm (d) and 30 mm (e)

Fig.5 SEM images of eutectic structure in DD90 superalloy with D=10 mm (a), 15 mm (b), 20 mm (c), 25 mm (d) and 30 mm (e)

Fig.6 Microsegregation coefficients of DD90 superalloy with different graphite sleeve thicknesses

Fig.7 The magnetic field (B) distributions in the melt of DD90 superalloy with D=10 mm (a), 15 mm (b), 20 mm (c), 25 mm (d) and 30 mm (e)

Fig.8 Flow field (v) distributions in the melt of DD90 superalloy with D=10 mm (a), 15 mm (b), 20 mm (c), 25 mm (d) and 30 mm (e)

Fig.9 Seebeck effect (a) and the thermal electromagnetic convection (b) in the interdendritic region (ΔT—temperature gradient; ΔV—potential gradient; F_T—thermal electromagnetic force; J_T—thermal electromagnetic flow; B—magnetic field )

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