REVIEW PAPER |
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Current Research Status of Electromagnetic Rail Materials Surface Failure and Strengthen Technology |
Tao YAN1,2(),Guimin LIU2,Shuo ZHU2,Linfei DU2,Yang HUI2
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1 Key Laboratory on Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072 2 Department of Equipment Maintenance and Remanufacturing Engineering, Academy of Armored Forces Engineering, Beijing 100072 |
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Abstract The performance of rail materials is the key to the application of the electromagnetic rail-gun. Under high carrier current and high temperature, the main surface failure forms of the electromagnetic rail are surface gouging, transition and the arc erosion, the current carrying friction and wear. This paper reviews the phenomenon, reasons and microscopic mechanism of gouging. A comprehensive summary of transition and arc erosion are expounded. The characteristics of current carrying friction and wear in the EM rail-gun are also summarized. The aim is to provide basis and reference for the development of new rail materials.
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Published: 10 January 2018
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Sketch map of electromagnetic rail-gun
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Gouge dents on the rail of copper alloy and arc erosion morphology
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Gouge threshold velocity of different armature materials (rail material is AISI1080 steel)
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Gouge threshold velocity of different rail materials (armature material is 7075 Al alloy)
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Comparison of gouging on (a) flat and (b) indented rail surfaces
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Connection between gouge threshold velocity and hardness of different materials
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Mechanism of the gouge happening
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Sketch map of transition happening
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Arc erosion morphology on Cu-W rail surface
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Part of CuCr and Dural rail surfaces after multishot experiments(applied energy: 1.45 MJ)
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SEM photomicrograph of Al fused coating with large pores on the copper rail
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Mutual fusion layer of Al armature and copper rail
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An actual brush armature
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Relationship between density specific heat capacity and melting point
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Relationship between electrical resistivity and volume/melt energy
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