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The dissolution and precipitation behaviours of M 7 C 3 and M 23 C 6 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 M 7 C 3 carbides were ductile and M 23 C 6 carbides were brittle. High holding temperature provided favourable conditions for M 7 C 3 carbides to precipitate and promoted the dissolution of bulky M 23 C 6 carbides. Two heat treatment sequences were designed. During aging treatment, dispersive rodlike nanoscale M 7 C 3 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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Zhang et al. (2019) studied this question.
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