Effect of electromagnetic centrifugal casting on solidification microstructure of cast high speed steel roll

摘要

Using self-made electromagnetic centrifugal casting machine, optical microscopy (OM) and D/ max2200pc X-ray diffraction, the solidification microstructure and phases of as-cast high speed steel(HSS) roll made by sand casting, centrifugal casting and electromagnetic centrifugal casting were investigated. The experiment results show that the phases of as-cast high speed steel (HSS) roll are alloy carbide (such as W_2C, VC, Cr_7C_3), martensite and austenite. The centrifugal casting and electromagnetic centrifugal casting can apparently improve the solidification structure of HSS roll. With the increase of electromagnetic field intensity (B), the volume fraction of austenite in the HSS solidification structure increased obviously and eutectic ledeburite decreased, the secondary carbide precipitated from the austenite is more fine and distribution of secondary carbide is more even.