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- Title
Effects of Magnetic Field on Microstructure, Phase Transformation and Ferrite Growth in Directionally Solidified Gray Cast Iron.
- Authors
Wang, Jiantao; Long, Zhipeng; Jiang, Qiuyue; Hou, Long; Yu, Xing; Li, Fei; Li, Xi
- Abstract
Advanced technologies and methods used in artificially tailoring the microstructure of Fe–C-based alloy hold the brilliant application prospect. Here, we demonstrate that the high magnetic field can decrease the flake graphite spacing, induce the disappearance of primary graphite, increase the eutectoid ferrite nucleation sites, and enhance the grain size distribution homogeneity of the eutectoid ferrite in the directionally solidified gray cast iron. These phenomena are mainly attributed to the magnetization behavior of the diffusion boundary layer and the different magnetizations between austenite and ferrite under the application of the magnetic field. Due to the magnetization of the diffusion boundary layer, the diffusion of C atoms is hindered, thus resulting in a decreased graphite spacing. The enhancement of the eutectoid ferrite nucleation is stemming from an increased eutectoid transformation temperature and the reduction of incubation time for the eutectoid transformation under the magnetic field. Further, the increased eutectoid transformation temperature also endows the decreased amount of the deformed ferrite grains and an amplified growth temperature range for ferrite, then the frequency of the low-angle misorientations reduces and that of the low-mobility CSL boundaries increases. In addition, because of the interaction among magnetic dipoles and the magnetocrystalline anisotropy, ferrite grains and graphite tend to align along the magnetic field direction. The current work is a successful demonstration of using the high magnetic field to tailor the solidification microstructure of gray cast iron, and paves a way for the development of the high-performance gray cast iron for industrial applications.
- Subjects
MAGNETIC field effects; CAST-iron; IRON founding; PHASE transitions; PARTICLE size distribution
- Publication
Metallurgical & Materials Transactions. Part A, 2023, Vol 54, Issue 7, p2631
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-023-07042-8