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Directional Solidification Microstructure of a Ni-Based Superalloy: Influence of a Weak Transverse Magnetic Field
- Source :
- Materials, Materials; Volume 8; Issue 6; Pages: 3428-3441, Materials, Vol 8, Iss 6, Pp 3428-3441 (2015)
- Publication Year :
- 2015
- Publisher :
- MDPI, 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.
- Subjects :
- crystal structure
Materials science
directional solidification
magnetic fields
segregation
Nucleation
lcsh:Technology
Article
Phase (matter)
Thermoelectric effect
General Materials Science
lcsh:Microscopy
Eutectic system
Directional solidification
lcsh:QC120-168.85
Condensed matter physics
lcsh:QH201-278.5
lcsh:T
Metallurgy
Microstructure
Magnetic field
Superalloy
lcsh:TA1-2040
lcsh:Descriptive and experimental mechanics
lcsh:Electrical engineering. Electronics. Nuclear engineering
lcsh:Engineering (General). Civil engineering (General)
lcsh:TK1-9971
Subjects
Details
- Language :
- English
- ISSN :
- 19961944
- Volume :
- 8
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- Materials
- Accession number :
- edsair.doi.dedup.....253fc5d94499edd63bf120d32c196155