Effect of electromagnetic stirring on the microstructure and wear behavior of iron-based composite coatings

Jiangbo Cheng1,2), Binshi Xu2), Xiubing Liang2), Yixiong Wu1), and Zhengjun Liu3) 1) School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China 2) National Key Laboratory for Remanufacturing, Academy of Armored Force Engineering, Beijing 100072, China 3) School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110023, China

摘 要：The effect of electromagnetic stirring on the microstructure and wear behavior of coatings has been investigated. A series of iron-based coatings were fabricated by the plasma-transferred arc cladding process by applying different magnetic field currents. The microstructure and wear resistance of the composite coatings were characterized by scanning electron microscope （SEM）, energy dispersive X-ray analysis （EDAX）, X-ray diffraction （XRD）, and wet sand rubber wheel abrasion tester. The experimental re- sults showed that the microstructure of the coatings was mainly the γ-Fe matrix and （Cr, Fe）7C3 carbide reinforced phase. The coatings were metallurgically bonded to the substrate. With increasing magnetic field current, the amount of the block-like （Cr, Fe）7C3 carbide reinforced phase increased at first, reached a local maximum, and then decreased sharply. When the magnetic field current reached 3 A, the block-like （Cr, Fe）7C3 carbides with high volume fraction were uniformly distributed in the matrix and the coating displayed a high microhardness and an excellent wear resistance under the wear test condition.

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