Abstract
A considerable scattering of impact toughness of low-alloy steel in two structural states have been studied in the ductile-brittle transition temperature region. It is shown that maximal impact toughness levels have a linear thermal dependence in the ductile-brittle transition temperature region. The increased scattering of impact toughness can be considered a characteristic of the ductile-brittle transition temperature region. Frequency distributions of impact toughness are aggregations of frequency distributions with different characteristics, which implies the existence of several simultaneously active mechanisms of cleavage initiation.
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