Formation and Decomposition Mechanism of Carbides in AISI M35 High-Speed Steel Produced by ESR

The morphology of carbides in AISI M35 high-speed steelHigh-speed steel electroslag remeltingElectroslag remelting ingot, as well as decompositionDecomposition mechanism of the carbides at high temperatureHigh temperature were investigated by thermodynamic calculations, microscopy analyses, and phase analyses. The calculation results indicated that the main types carbides formed in steelSteel during solidificationSolidification were MC and M2CM2C. Through observation, it was found that there were lots of network eutectic carbidesNetwork eutectic carbides in the electroslag ingot, and the size of carbides at the center was larger than that at the edge. The micro morphologies of carbides in the ingot mainly had two types: a lath-like shape and a brain one, and both phases were identified as M2CM2C. They could be decomposed and formed new phases MC and M6C at high temperaturesHigh temperature. The decompositionDecomposition of M2CM2C carbides occurred obviously with the increasing holding temperatureTemperature, especially at 1,423 to 1,473 K. Which were more easily broken and deformed in the subsequent working.