Physical simulation of internal crack healing in a heavy-forged billet

The healing behavior of internal cracks in an ingot during the forging process was investigated using laboratory and industrial simulation studies. During the laboratory experiment, specimens with artificial cracks were hot compressed by a Gleeble simulator, and the effect of temperature and deformation ratio on inner crack healing was studied. The experimental result shows that the higher the deformation temperature or greater the deformation, the better the healing effect. To verify the accuracy and applicability of the result in an actual forging process, an industrial experiment was designed and performed. The result shows that internal cracks can be effectively metallurgically bonded at a temperature of 1200℃ and deformation ratio of 40%.