Abstract
The dissolution and precipitation behaviours of M7C3 and M23C6 carbides in 8Cr13MoV steel were calculated using Thermo-Calc software. The mechanical properties of carbides were calculated using the Vienna Ab-initio Simulation Package. Results showed that M7C3 carbides were ductile and M23C6 carbides were brittle. High holding temperature provided favourable conditions for M7C3 carbides to precipitate and promoted the dissolution of bulky M23C6 carbides. Two heat treatment sequences were designed. During aging treatment, dispersive rodlike nanoscale M7C3 carbides precipitated from matrix, which improved wear resistance and the retention ability of the cutting edge of knives by 56 and 22%, respectively.
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