Conclusions
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1.
Precipitation of ferrite in hypoeutectoid steel in the form of large needles and plates with a specific orientation lowers the fracture toughness.
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2.
The fracture toughness of steel 35 with excess ferrite in the form of thin needles growing from a boundary network is at the same level as (or somewhat higher than) the fracture toughness of samples with equiaxed ferrite.
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3.
Increasing the percentage of quasieutectoid and reducing the grain size by rapid cooling compensate the harmful effect of Widmanstatten ferrite on the fracture toughness of steel 35.
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Additional information
Institute of Ferrous Metallurgy, Dnepropetrovsk. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 32–34, February, 1979.
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Koval'chuk, G.Z., Geichenko, V.N., Yarmosh, V.N. et al. Effect of Widmanstatten ferrite on some properties of hypoeutectoid steel. Met Sci Heat Treat 21, 114–117 (1979). https://doi.org/10.1007/BF00801483
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DOI: https://doi.org/10.1007/BF00801483