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Grain refinement effect of pulsed magnetic field on solidified microstructure of superalloy IN718

Published online by Cambridge University Press:  31 January 2011

Xiaoping Ma ,
Yingju Li  and
Yuansheng Yang
Yuansheng Yang*
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The refinement mechanism of pulsed magnetic field (PMF) was discussed by experimental investigation, and the effects of exciting frequency, exciting voltage, and delay time of PMF on grains refinement of superalloy were studied. The experimental results show that, as exciting frequency or exciting voltage is increased, the grains are refined. However, the grains become coarse when frequency increases further. As delay time of PMF increases, the grain size increases. The refinement effect of PMF is attributed to the detachment of heterogeneous nuclei on the mold wall and subsequently separation of nuclei in the melt. The Joule heat can prolong the continuous nucleation process. However, the refinement effect will be impaired if the Joule heat is strong enough to remelt the detached nuclei.

Keywords

CastingGrain sizeNucleation & growth
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 10 , October 2009 , pp. 3174 - 3181
Copyright
Copyright © Materials Research Society 2009

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