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The effect of various factors (hydrogenation, segregation of phosphorus, arsenic and other elements), which reduce the cohesive strength of grain boundaries, on the ductile-brittle transition in structural steels is considered. It is shown that during brittle fracture accompanied by weakening of cohesive strength of grain boundaries, the free path length of brittle crack of Λb becomes a variable value,...
The effect of structural characteristics (ferrite, ferrite + pearlite, sorbite) including morphology, size and distribution of nonmetallic inclusions of different morphology, sizes and distribution, on ductile–brittle transition in structural steels is considered. It is shown that an elementary ductile microcrack is initiated by particles of critical size. For steels with ferrite-pearlite and sorbite...
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