Effects of laser surface hardening on microstructure and hardness of high Ni-Cr indefinite chill cast iron roll

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The influence of low frequency electromagnetic field on ingot surface quality and as-cast microstructure in horizontal direct chill ( HDC ) casting process were investigated experimentally .

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Formation and Effect of Woven-carbides in Surface Layer of Indefinite Chill Cast-iron Roller

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By the procedure of spraying the Ni-matrix alloy transition layer on the surface of casting defect and using multi-alloying cast iron homogeneous electrode with high welding current and continuous welding technique obtained the homogeneous welding zone in which there is no chill structure and crack .

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The chill depth has the power-law relationship to the surface hardness of the melting zone . The larger the chill depth the higher is hardness value .

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The shrinkage void porosity and surface sinking in Al pattern plate have been eliminated by means of pressurized solidification in connection with technological core and inner chill in heavy thickness in ceramic mold .

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