Observations on the Upper Shelf Crack Tip Blunting Behavior of Ultra High Strength Steels.

摘要

Crack tip blunting has been investigated for two steel in the as-quenched conditions and after tempering at 565 C. The as-quenched microstructures blunt smoothly while the tempered microstructures blunt to vertices. The results indicate that if two microstructures have the same plane strain ductility and the same inclusion distributions and one blunts smoothly while the other blunts to vertices, the microstructure which blunts to vertices can have considerably higher toughness than the microstructure which blunts smoothly. Reprints.