Nondestructive effect of the cusp magnetic field on the dendritic microstructure during the directional solidification of Nickel-based single crystal superalloy
来源期刊:JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第3期
论文作者:Xiaotan Yuan Tao Zhou Weili Ren Jianchao Peng Tianxiang Zheng Long Hou Jianbo Yu Zhongming Ren Peter K.Liaw Yunbo Zhong
文章页码:52 - 59
摘 要:The mechanical-property improvement of directionally-solidified Nickel-based single crystal(SC) superalloy with the single-direction magnetic fields is limited by their destructiveness on the dendritic microstructure.Here,the work present breaks through the bottleneck.It shows that the application of the cusp magnetic field(CMF) ensures that the dendrites are not destroyed.This feature embodies that the primary dendrite trunks arrange regularly and orderly,as well the secondary dendrite arms grow symmetrically.By contrast,both the unidirectional transverse and longitudinal magnetic field destroy the dendrite morphology,and there are a number of stray grains near the totally-re melted interface.The nondestructive effect is achieved mainly by the combined action of the thermoelectromagnetic force on the dendrites and thermoelectromagnetic convection in the melt during directional solidification.The investigation should contribute a new route for dramatically and effectively improving the crystal quality and mechanical properties of the directionally-solidified alloys.
Xiaotan Yuan1,Tao Zhou1,Weili Ren1,Jianchao Peng2,Tianxiang Zheng1,Long Hou1,Jianbo Yu1,Zhongming Ren1,Peter K.Liaw3,Yunbo Zhong1
1. State Key Laboratory of Advanced Special Steel, College of Materials Science and Engineering, Shanghai University2. Laboratory for Microstructures, Shanghai University3. Department of Materials Science and Engineering, The University of Tennessee
摘 要:The mechanical-property improvement of directionally-solidified Nickel-based single crystal(SC) superalloy with the single-direction magnetic fields is limited by their destructiveness on the dendritic microstructure.Here,the work present breaks through the bottleneck.It shows that the application of the cusp magnetic field(CMF) ensures that the dendrites are not destroyed.This feature embodies that the primary dendrite trunks arrange regularly and orderly,as well the secondary dendrite arms grow symmetrically.By contrast,both the unidirectional transverse and longitudinal magnetic field destroy the dendrite morphology,and there are a number of stray grains near the totally-re melted interface.The nondestructive effect is achieved mainly by the combined action of the thermoelectromagnetic force on the dendrites and thermoelectromagnetic convection in the melt during directional solidification.The investigation should contribute a new route for dramatically and effectively improving the crystal quality and mechanical properties of the directionally-solidified alloys.
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