Defects caused by improper cooling after forging usually include the following:
1. Cooling cracks During the cooling process after forging, large thermal stress will be generated inside the forging due to excessive cooling rate, and large structural stress may also be caused by structural transformation.
If these stresses exceed the strength limit of the forging, smooth and elongated cooling cracks will occur in the forging.
2. Network carbides When forging steel with high carbon content, if the forging stop temperature is high and the cooling rate is too slow, carbides will precipitate in a network along the grain boundaries.
For example, when bearing steel is slowly cooled at 870 to 770°C, carbides will precipitate along the grain boundaries. Reticular carbides can easily cause quenching cracks during heat treatment.
In addition, it also deteriorates the performance of the parts.
Link to this article：Defects often caused by improper cooling process after forging
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