熔覆速度对AlCoCrFeNi高熵合金等离子熔覆涂层组织和性能的影响OA

To investigate the effect of plasma cladding speed on the microstructure and properties of AlCoCrFeNi high-entropy alloy coatings,AlCoCrFeNi high-entropy alloy plasma cladding coatings were prepared on the surface of 35CrMo steel at cladding speeds of 420 mm/min,300 mm/min,and 180 mm/min,respectively.The microstructure and properties of the coatings obtained at different cladding speeds were characterized and tested using stereomicroscope,metallographic microscope,X-ray diffractometer,and microhardness tester.Results indicate that as the cladding speed decreases,the cross-sectional dimensions of the cladding layer gradually increase,while the dilution rate gradually decreases.In each cladding layer,planar,columnar,dendritic crystals,and equiaxed crystals appear sequentially from the bottom to the top,and the grain size at each position increases with the decrease in cladding speed.Each cladding layer's microhardness and corrosion resistance are significantly superior to those of the 35CrMo substrate.As the cladding speed decreases,the microhardness of the cladding layer gradually decreases,while the corrosion resistance gradually increases.