Abstract
The critical event of cleavage is variable for different types of specimens made of the same steel. In notched specimens (Charpy V or 4 PB) over a wide temperature range as low as -196°C, the critical event is the propagation of a ferrite grain-sized crack (30-40µm). In precracked specimens at a moderately low temperature (around -110°C) it is the propagation of a second phase particle-sized crack (< 10µm). At ever lower temperatures (-150°C - -196°C) the cleavage fracture is nucleation-controlled.
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