Defects in Forged Parts

DEFECTS IN FORGED PARTS

1.Unfilled Sections.

In this some of the die cavity are not completely filled by the flowing metal.

2.Cold Shuts.

This appears as small cracks at the corners of the forging. Caused due to improper design of die.

3.Scale Pits.

This is seen as irregular depositions on the surface of forging. This is primarily caused because of improper cleaning of the stock used for forging.

The oxides and scales gets embedded into the finish forging surface.

When the forging is cleaned by pickling, these are seen  as deputations  on the forging surfaces.

4.Die Shifts.

This is caused by the mis-alignment of the half dies, making the two halves of te forging to be of improper shape. It is also called as mismatch.

5..Flakes.

These are basically ruptures caused by the improper cooling of the large forging. Rapid cooling causes the exterior to cool quickly causing internal fractures.

6.Improper Grain Flow.

Due to improper design of the die, which makes the flow of the metal to be not in the final intended direction?

7.Laps.

Laps are formed by webbuckling during forging. To avoid laps web thickness should be increased and properly edesigned.