Abstract
In this chapter, essential contents of the micromechanism of cleavage fracture are addressed first. Then, a general description of microscopic cracking processes in cleavage fracture is drawn. This is followed by a detailed elucidation of crack nucleation and propagation, including: the mechanism of crack nucleation and types of crack nucleation entities; the criterion for the crack nucleation; the mechanisms of crack propagation in three subregions in the lower shelf toughness-transition temperature region, that is, lower than −130°C, in the range of −130°C to −80°C, and in the range of −80°C to −60°C; and the mechanism of propagation of a grain-sized crack into contiguous grains at higher temperature.
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