06-05-2017, 01:29 AM
Yes, Mr. Grepper. Strength and ductility of steels are controlled by dislocations. Dislocations are places where atoms are out of the position in the regular crystal lattice.
When a stress is applied dislocations are generated, move through the grains and pile up at boundaries of internal grains. This causes that the surface grains have lower resistance against deformation.
When a stress is applied dislocations are generated, move through the grains and pile up at boundaries of internal grains. This causes that the surface grains have lower resistance against deformation.