Effect of Applied Pulsed Magnetic Field during Directional Solidification on Solidified Structure of H13 Steel

doi:10.11901/1005.3093.2016.226

Chinese Journal of Materials Research

2017, Vol. 31

Issue (10): 721-727 DOI: 10.11901/1005.3093.2016.226

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Effect of Applied Pulsed Magnetic Field during Directional Solidification on Solidified Structure of H13 Steel

Jianwei ZHANG, Yingju LI, Yuansheng YANG(

)

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

Jianwei ZHANG, Yingju LI, Yuansheng YANG. Effect of Applied Pulsed Magnetic Field during Directional Solidification on Solidified Structure of H13 Steel. Chinese Journal of Materials Research, 2017, 31(10): 721-727.

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Abstract

The effect of pulsed magnetic field (PMF) on the solidified structure of H13 steel during directional solidification with various growing rates was investigated. It was found that the primary dendrite arm spacing (λ₁) and the secondary dendrite arm spacing (λ₂) both decreased under the PMF with exciting voltages in a range of 50 V-200 V. λ₁and λ₂decreased with the increase of exciting voltage. With the increase of magnetic field frequency, λ₁ and λ₂firstly decreased and then increased. While with the increase of growing rate, the reduction degree of λ₁ and λ₂ decreased. The PMF causes melt convection during directional solidification, which brings hot melt in the heating zone to the solidification front, thus the temperature gradient near the solidification front increases, leading to the decrease of λ₁ and λ₂.

Key words: metallic materials pulsed magnetic field directional solidification dendrite arm spacing H13 steel

Received: 26 April 2016

ZTFLH:

TG111

Fund: Supported by National Natural Science Foundation of China (Nos.51674236 & 51034012)

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.226 OR https://www.cjmr.org/EN/Y2017/V31/I10/721

Fig.1 Schematic of experimental apparatus

Fig.2 Dendrites in H13 steel directionally solidified with various pulsed voltages Transverse section: (a1), 0 V; (b1), 50 V; (c1), 100 V; (d1), 150 V; (e1), 200 V; Longitudinal section: (a2), 0 V; (b2), 50 V; (c2), 100 V; (d2), 150 V; (e2), 200 V

Fig.3 Dendrite arm spacings of H13 steel directionally solidified with various pulsed voltages

Fig.4 Dendrites in H13 steel directionally solidified with various magnetic field frequencies Transverse section: (a1), 0 Hz; (b1), 2.5 Hz; (c1), 5 Hz; (d1), 10 Hz; (e1), 20 Hz; Longitudinal section: (a2), 0 Hz; (b2), 2.5 Hz; (c1), 5Hz; (d1), 10 Hz; (e1), 20 Hz

Fig.5 Dendrite arm spacings of H13 steel directionally solidified with various magnetic field frequencies

Fig.6 Dendrites in H13 steel directionally solidified at various pulling velocities on transverse section without PMF: (a) 30 μm/s; (c) 70 μm/s; (e) 130 μm/s; with 5 Hz/200 V PMF: (b) 30 μm/s; (d) 70 μm/s; (f) 130 μm/s

Fig.7 Dendrites in H13 steel directionally solidified at various pulling velosities on longitudinal section without PMF: (a) 30 μm/s; (b) 70 μm/s; (c) 130 μm/s; with PMF of 5 Hz/200 V: (d) 30 μm/s; (e) 70 μm/s; (f) 130 μm/s

Fig.8 Dendrite arm spacings of H13 steel directionally solidified with various pulling velocities: (a) primary dendrite arm spacings; (b) secondary dendrite arm spacings

Fig.9 Schematic illustration of the effect of melt flow on the temperature gradient at solidification front: (a) without PMF; (b) with PMF

Fig.10 Dendrites in H13 steel directionally solidified on longitudinal section: (a) without PMF; (b) with 5 Hz/200 V

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