Abstract
The proposed prediction model on a cleavage fracture initiation in ferrite–cementite steels is applied to the fracture toughness tests using notched specimens of steels with various sizes of ferrite grain and cementite particle. The prediction results of fracture toughness and fracture initiation site showed good agreement with the experimental results for all the steels and temperatures tested. The results of parametric studies using hypothetical steels successfully show the influence of the sizes of microstructures on fracture toughness. The results also show that the transition of bottleneck process in the fracture initiation with increasing temperature.
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