Copper alloy forgings may have different defects during use, and the existence of these defects will directly affect the quality of the forgings. The causes of common copper alloy forging defects are described in detail below.
- Cut the seam
In the process of forging copper alloy forgings, due to the shrinkage and distortion of metal molecular volume and other factors, the surface or internal linear cracking occurs, that is, slit. Slit is usually caused by high temperature, uneven cooling, porosity and inclusions. High temperature thermal cracking is one of the main reasons, because when the cross-sectional area is reduced, the temperature is very high, and the metal material is prone to tensile and tearing under the influence of thermal stress. - Slag inclusion
Slag inclusion is caused by the presence of contaminants and impurities in the raw materials, molds and processing equipment themselves, and they are not completely cleaned, and these impurities enter the interior of the copper alloy forgings. Slag inclusion will reduce the strength and stability of copper alloy forgings, it is difficult to meet the design requirements, and may even lead to the fracture of copper alloy forgings. - Holes and pores
The main reason for the formation of holes and pores in copper alloy forgings is the limitation of material processing technology and design specifications. In the process of steel processing, if it is not processed strictly in accordance with the design specifications, it is easy to form holes and pores inside and on the surface of the material. In addition, elements such as oxygen and sulfur inside the material can also cause pores or excessive gas vesicles to form in the material. - Cracks
In the process of production and use, copper alloy forgings are susceptible to external forces, such as extrusion, top adjustment, shear, etc., resulting in the formation of cracks on the surface or inside. The generation of cracks is mainly due to physical stress concentration and structural fatigue and other factors, usually due to the material itself and the processing quality caused.
To sum up, the defects of copper alloy forgings are caused by many factors, among which material processing quality and design specifications are one of the most important factors affecting the quality of copper alloy forgings. Only by ensuring the rigor of material processing and production process can we reduce the probability of defects in copper alloy forgings as much as possible and improve the quality and service life of forgings.
