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Effect of nitrogen substituting carbon on high-temperature mechanical properties and wear performance of Cr-Mo-V hot-working die steel
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DOI：10.1016/j.jmrt.2024.12.033.png)
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Abstract
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The effect of nitrogen substituting carbon on the high-temperature mechanical properties and wear performance of Cr-Mo-V hot-working die steel (HWDS) at 500-600 degrees C was investigated. The results indicate that nitrogen substitution for carbon significantly increased the quantity and stability of undissolved V(C, N), enabling the quenching temperature of the steel to increase from 1030 degrees C to 1100 degrees C while obtaining grains of similar size. Nitrogen substitution for carbon could increase both the strength and plasticity of Cr-Mo-V steel at 500 degrees C, while decreasing the plasticity at 600 degrees C due to weaker bonding force between the undissolved V-rich carbides and matrix. The influence of nitrogen substituting carbon on high-temperature wear resistance is consistent with its influence on high-temperature plasticity. Nitrogen substitution for carbon intensifies the degree of hightemperature oxidation, improving wear-resistance of HWDS at 500 degrees C, but reduces the wear resistance at 600 degrees C. These different effects are mainly attributed to the different roles played by undissolved V-rich carbides at different temperatures.
Keywords:
Hot-working die steel
Nitrogen substituting carbon
High-temperature wear performance
Oxidative wear
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