Proposal and use of a void model for inclusion cracking for simulating inner fracture defects in drawing of ferrite–pearlite steels

• An ellipsoidal void model for inclusion cracking is proposed.
• The model is applied to the simulation of ductile fracture of ferrite–pearlite steels.
• Material density at fracture by the model agrees with the experimental value.
• Material density by the previous model does not agree with the experimental value.

A void model for inclusion cracking is proposed and used for simulating inner fracture defects in the drawing of ferrite–pearlite steels. First, a void model for inclusion cracking is proposed based on the void model for inclusion-matrix separation previously proposed by the author. Next the simulation and experiment of the multipass drawing are performed using four types of ferrite–pearlite steels. The inner diameter of the die at which the material fractures, the material density distribution in the radial direction after drawing through the die preceding that at which the material fractures, and the material shape in the longitudinal section after drawing through the die at which the material fractures calculated from the simulation, are compared with those obtained experimentally. Finally, the validity of the proposed void model is confirmed by comparing the simulation and experimental results.

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