Effect of pulsed magnetic field on solidification structures of metals
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Metal Solidification Research Group, Shanghai University. Effect of Pulsed Magnetic Field on Solidification Structures of Metals. Zhai Qi-Jie *, Gao Yu-Lai, Li Qiu-Shu. *Corresponding author, email: qjzhai@staff.shu.edu.cn Personal website: http://www.foundrymate.com. October 11, 2004.

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Effect of Pulsed Magnetic Field on Solidification Structures of Metals

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  • Metal Solidification Research Group, Shanghai University

Effect of Pulsed Magnetic Field on Solidification Structures of Metals

Zhai Qi-Jie *, Gao Yu-Lai, Li Qiu-Shu

*Corresponding author, email: qjzhai@staff.shu.edu.cn

Personal website: http://www.foundrymate.com

October 11, 2004


  • Metal Solidification Research Group, Shanghai University

Four Parts:

  • Background

  • Experimental procedure

  • Results and discussion

  • Conclusions


  • Metal Solidification Research Group, Shanghai University

Background:

  • Can obviously refine the solidification structure

  • No research on pure metal, e.g. Al

  • No consensus is acquired about the effect of

    magnetic field

  • Little information is available about the

    refinement mechanism


  • Metal Solidification Research Group, Shanghai University

Experimental procedure:

  • High-voltage pulsed power source

    and the solidification equipment

  • Materials choose: pure Al, gray iron and

    stainless steel

  • Analysis methods: OM, TA


(b)

(a)

10mm

10mm

10mm

10mm

(c)

(d)

  • Metal Solidification Research Group, Shanghai University

Results and Discussions——Effect on Al

  • B=0T

  • (b) B=0.3T

  • (c) B=0.38T

  • (d) B=0.51T

Macrostructure of the solidified samples under the pulsed magnetic field with different intensities


  • Metal Solidification Research Group, Shanghai University

Results and Discussions——Effect on Al

Relation between the intensity of the pulsed magnetic field and the average grain size


  • Metal Solidification Research Group, Shanghai University

Results and Discussions——Effect on Al

Distribution of the magnetic induction intensity in the intense magnetic generator


  • Metal Solidification Research Group, Shanghai University

Results and Discussions——Effect on Al

Relationship between the intensity of pulsed magnetic field and solidification temperature


  • Metal Solidification Research Group, Shanghai University

Results and Discussions——Effect on gray iron

Chemical composition of experimental gray iron


(a)

(b)

75 μm

75 μm

75 μm

75 μm

(d)

(c)

  • Metal Solidification Research Group, Shanghai University

Results and Discussions——Effect on gray iron

(a) B=0T

(b) B=1.2T

(c) B=3.1T

(d) B=6.4T

Graphite morphology of hypoeutectic gray iron under different pulsed magnetic field parameters


(b)

(a)

75 μm

75 μm

75 μm

75 μm

(c)

(d)

  • Metal Solidification Research Group, Shanghai University

Results and Discussions——Effect on gray iron

(a) B=0T

(b) B=0.3T

(c) B=1.2T

(d) B=2.6T

Graphite morphology of hypereutectic gray iron under different pulsed magnetic field parameters


  • Metal Solidification Research Group, Shanghai University

Results and Discussions——Effect on gray iron

Effect of the magnetic intensity on the

length of the graphite

Effect of the magnetic intensity on the thickness of the graphite


  • Metal Solidification Research Group, Shanghai University

Results and Discussions——Effect on gray iron

B=3.1T

B=0T

Relation between the temperature and time for solidification of gray iron


(c)

(b)

(d)

(a)

(g)

(e)

(f)

(h)

10mm

10mm

10mm

10mm

10mm

10mm

10mm

10mm

  • Metal Solidification Research Group, Shanghai University

Results and Discussions——Effect on stainless steel

(a)B=0T

(b)B=0.78T

(c)B=1.10T

(d) B=1.35T

(e)B=1.8T

(f)B=3.00T

(g) B=3.24T

(h) B=3.84T


  • Metal Solidification Research Group, Shanghai University

Conclusions:

The solidified structure of pure aluminum evolved from columnar grains to equi-axed ones, and the grain size becomes smaller as the augment of the intensity of pulsed magnetic field. The effect of the pulsed magnetic field on the solidification temperature of Al can be neglected.

The pulsed magnetic field can refine and improve the graphite morphology of the gray iron. Also, the pulsed magnetic field can decrease its undercooling of the eutectic transformation.


  • Metal Solidification Research Group, Shanghai University

Conclusions:

The solidification structures of austenitic stainless steel are changed from coarse columnar crystals to narrow and thin ones after adding pulsed magnetic field. However, equi-axed grains can’t be obtained.


  • Metal Solidification Research Group, Shanghai University

Acknowledgement:

Financially supported by

(1) National Natural Science Foundation of China, (2) Science and Technology Committee of Shanghai

Municipality


The end. Thank you!


  • Metal Solidification Research Group, Shanghai University

Experimental equipments:


3

2

1

4

10

5

6

7

9

8

  • Metal Solidification Research Group, Shanghai University

Schematic of the solidification equipment:

1-Magnetic field generator 2− Pouring cup

3−Liquid metal

4−Mould

5−Cooling System 6−Computer-controlled

thermometric system

7−Pad

8−Mobile platform

9-Thermal couples

10-Pulse power source


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