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Abstract
The influence of chemical composition and thermomechanical processing parameters on the Charpy impact energy of grade 420/460 TMCR (thermomechanically controlled rolled) steels was investigated using fuzzy modelling technology. Fuzzy modelling was applied to develop generic models for the prediction of Charpy impact properties. The fuzzy models obtained, which involved chemical compositions, processing conditions, and Charpy impact energy, were used to reveal correlations between individual influence factors and Charpy impact toughness. Numeric analysis shows that low carbon equivalent value (CEV), low sulphur residual, and low processing temperature are all beneficial to impact toughness, predictions which fit with known metallurgical knowledge thus demonstrating the integrity of the model.