2019 Volume 60 Issue 701 Pages 167-174
In the manufacturing process of large forged steel products, internal quality must be improved by introducing stress and strain. The effect of the forging pass schedule on the consolidation behavior of internal defects can be evaluated using consolidation parameter Q-value calculated from the hydrostatic stress and the equivalent strain. In this study, we performed the actual steel ingot test to clarify the consolidation behavior and threshold of Q-value. Subsequently, the effect of the void distribution on the Q-value was investigated. The density distributions of initial defects were determined by solidification simulation calculation and the change in density distribution with increasing Q-value was investigated by forging simulation. After conducting this preliminary study, we report the result of verifying void closure using a tool for actual forging process design.