The addition of small amounts of boron (0.002%) and its distribution in the boundaries of zones and its interaction with carbon make it possible to obtain a substructure of martensite that is finer and more even in size after quenching of highly deformed medium-carbon steel, and a more dispersed substructure of martensite and carbides precipitated during low-temperature tempering of the steel.
The effect of boron on the structural parameters facilitates, along with other factors, obtaining high values of the notch toughness (a=8 kg-m/cm2) and high values of the work of crack propagation in medium-carbon steel of the 40G type with high strength (ob=180 kg/mm2).
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Pyatakova, L.L., Mints, I.I., Berezina, T.G. et al. Structure and toughness of medium-carbon steel with boron. Met Sci Heat Treat 18, 47–51 (1976). https://doi.org/10.1007/BF00663749
- Notch Toughness