sharp transition and it is difficult to obtain a precise transition temperature: it is really a transition region. Usually, the Charpy energy decreases as temperature decreases.

An exact DBTT can be derived empirically in several ways, for example, the temperature at which Charpy energy reaches the midpoint between the high-temperature maximum and the low-temperature minimum. It may also be defined qualitatively, as the point at which 50% of the area being cleavage. However, these two definitions may differ .

The relationship

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