PRODUCT
Raw material impact on the quality of forgings
by:Waxing
2020-09-30
The good quality of raw materials is a prerequisite to ensure the quality of forgings, such as raw material defect, will affect the quality of forgings and forging forming process of the final.
Such as raw materials of chemical elements beyond the prescribed scope, or impurity element content is too high, the quality of forgings forming and will bring great influence, for example: S, B, Cu, Sn elements such as formation of low melting point phase, forging heat brittle is seen.
04% (
The mass fraction)
。
Content is too little, don't control the effect of grain growth, often easy to make the essence of the forgings unqualified grain size;
Aluminum content too much, the pressure process under the condition of the formation of fibrous tissue formation of wood grain fracture, tear mark fracture, etc.
As another example, in 1 cr18ni9ti austenitic stainless steel, Ti, Si, Al, Mo content, the more the ferrite phase, the more the more easily when forging forming banded crack, and make the parts with magnetism.
Residual, subcutaneous bubbles exist inside such as the raw material shrinkage tube, serious carbide segregation, bulky non-metallic inclusions (
Slag)
Defects, such as forging when make the forging cracks easily.
Raw materials of dendritic crystal, severe osteoporosis, non-metallic inclusion, white spots, oxide film, segregation and different metal mixed defects such as, easy cause forging performance degradation.
The surface crack of raw materials, folding, scarring, coarse grain ring and so on easy to cause the surface of the forging cracks.
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