| 1. |
The increase of the fracture toughness with increasing amounts of pearlite up to 20% coincides with the rapid increase in strength due to the sharp reduction of the distance between pearlite inclusions. With larger amounts of pearlite, leading to an increase in the size of the inclusions, the inclusions tend to split under the influence of local stress concentrations at the tip of the moving crack, facilitating fracture.
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| 2. |
The fracture toughness of structural steel with a polygonal ferritic—pearlitic structure is highest with about 20% pearlite.
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All-Union Institute of Aviation Materials, Moscow. Translated from Problemy Prochnosti, No. 2, pp. 87–92, February, 1978.