The Solidification Technology of Pulsed Magneto Oscillation

doi:10.11900/0412.1961.2017.00536

Acta Metall Sin

2018, Vol. 54

Issue (5): 757-765 DOI: 10.11900/0412.1961.2017.00536

Special Issue for the Solidification of Metallic Materials

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The Solidification Technology of Pulsed Magneto Oscillation

Yongyong GONG^1,², Shumin CHENG², Yuyi ZHONG², Yunhu ZHANG¹, Qijie ZHAI¹(

)

1 State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China
2 College of Science, Shanghai University, Shanghai 200444, China

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Yongyong GONG, Shumin CHENG, Yuyi ZHONG, Yunhu ZHANG, Qijie ZHAI. The Solidification Technology of Pulsed Magneto Oscillation. Acta Metall Sin, 2018, 54(5): 757-765.

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Abstract

With the development of metallurgical technology, some requirements such as high homogenization, high purification, superfine crystallization and low consumption have been put forward for the properties of metal materials. The pulse electromagnetic field has become the development direction of the new generation of metallurgy due to its energy saving, convenient application and refinement effect. The technology of pulse electromagnetic field in solidification includes electric current pulse, pulsed magnetic field and pulsed magneto oscillation (PMO). Based on the theories of pulsed current and electromagnetic stirring, the pulse current is applied to the induction coil in PMO technique. The melt is induced by magnetic field to produce electromagnetic force, and thereby, the non-contact treatment can be achieved to avoid dirtying the melt. In this paper, PMO technique is introduced, including invention process, theoretical basis, refinement mechanism, research status and its applications.

Key words: electromagnetic field pulsed magneto oscillation (PMO) equiaxed grain crystalnucleus crystal shower Lorentz force flow velocity

Received: 14 December 2017

ZTFLH:

TG111.4

Fund: Supported by National Natural Science Foundation of China (Nos.51504048, 50574056 and U1760204), and National Key Research and Development Program of China (No.2017YFB0701800)

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	Yongyong GONG
	Shumin CHENG
	Yuyi ZHONG
	Yunhu ZHANG
	Qijie ZHAI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00536 OR https://www.ams.org.cn/EN/Y2018/V54/I5/757

Fig.1 The structures of sample in axial when isolation network is placed horizontally^[46]
(a) untreated (b) treated by pulsed magneto oscillation (PMO)
(c) treated by PMO when isolation network is unused=

Fig.2 The device of surface pulsed magneto oscillation (SPMO)^[38]
(a) pulse generator (b) SPMO is imposed on the melt

Fig.3 The temperature curve under PMO^[49]

Fig.4 Morphologies of solidified tissue refinement untreated (a) and treated (b) by PMO at 1.3 K above the melting point^[54]

Fig.5 Relationship between the cooling rate and average grain size of samples treated and untreated by PMO^[53]

Fig.6 Schematics of cooling curve (a) and local enlarged curve (b) when using PMO^[53]

Fig.7 Grain size (a) and optical images (b) of samples after PMO treatment applied at various segments (Mean values in Fig.7a are presented above columns)^[53]

Fig.8 The structures of sample in axial when isolation network is placed vertically untreated (a) and treated (b) by PMO^[46]

Fig.9 Nucleation in a cylindrically shaped cavity (r_cis cavity root radius; α, β and S are liquid, solid and foreign phases, respectively; θ is the contact angle; h is the height)^[54]

Fig.10 The schematic of pulse magnetic oscillation test in second cold zone^[57]

Fig.11 Macrostructures of cross section of GCr15 bearing steel billet treated (a) and untreated (b) by PMO (b)^[57]

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