Abstract
The present paper proposes a new computational model in which the Charpy impact property of steels is predicted from the microstructural information and tensile properties. During cleavage fracture, the Charpy impact property is controlled by the presence of a martensite-austenite constituent (MA) in the predominantly upper bainite microstructure in the weld heat-affected zone and is based on the weakest link mechanism and the micromechanics of the cleavage fracture. The cleavage fracture strength equation has been modified to statistically account for microcrack nucleation and propagation. An example calculation reveals that the proposed model reproduces the Charpy absorbed energy transition curve with a scatter in toughness. The validation of the model with experimental data is presented in the companion paper.
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