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Materials 2015, 8(6), 3428-3441; doi:10.3390/ma8063428

Directional Solidification Microstructure of a Ni-Based Superalloy: Influence of a Weak Transverse Magnetic Field

1
,
1,2,* , 1
,
1
and
3
1
Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
2
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
3
School of Material Science and Engineering, Shanghai University, Shanghai 200240, China
*
Author to whom correspondence should be addressed.
Academic Editor: Jordi Sort
Received: 9 March 2015 / Revised: 29 May 2015 / Accepted: 29 May 2015 / Published: 10 June 2015
(This article belongs to the Section Structure Analysis and Characterization)
View Full-Text   |   Download PDF [6540 KB, uploaded 10 June 2015]   |  

Abstract

A Ni-based superalloy CMSX-6 was directionally solidified at various drawing speeds (5–20 μm·s−1) and diameters (4 mm, 12 mm) under a 0.5 T weak transverse magnetic field. The results show that the application of a weak transverse magnetic field significantly modified the solidification microstructure. It was found that if the drawing speed was lower than 10 μm·s−1, the magnetic field caused extensive macro-segregation in the mushy zone, and a change in the mushy zone length. The magnetic field significantly decreases the size of γ’ and the content of γ-γ’ eutectic. The formation of macro-segregation under a weak magnetic field was attributed to the interdendritic solute transport driven by the thermoelectric magnetic convection (TEMC). The γ’ phase refinement could be attributed to a decrease in nucleation activation energy owing to the magnetic field during solid phase transformation. The change of element segregation is responsible for the content decrease of γ-γ’ eutectic. View Full-Text
Keywords: directional solidification; crystal structure; magnetic fields; segregation directional solidification; crystal structure; magnetic fields; segregation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, X.; Wang, J.; Zhang, J.; Han, Y.; Li, X. Directional Solidification Microstructure of a Ni-Based Superalloy: Influence of a Weak Transverse Magnetic Field. Materials 2015, 8, 3428-3441.

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