A simple theory for the Charpy V transition temperature TCV in mild steel is proposed. The yield stress σy and the internal cleavage fracture stress σf play an important role in the theory and, therefore, have been the subject of detailed experimental and theoretical studies. Experimentally recorded values of TCV in a C-Mn steel of varying grain size and a microalloyed steel are compared with the corresponding theoretical values. The results are critically discussed.
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