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Basic measures to prevent shrinkage porosity of castings

The causes of shrinkage cavity and porosity of nodular cast iron are complex. The main factors affecting primary shrinkage, volume expansion and secondary shrinkage are metallurgical quality and cooling rate of molten iron, as well as the effect of spheroidizing and inoculation treatment. The metallurgical quality of nodular cast...

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Causes of shrinkage porosity in ductile iron castings

The solidification process of ductile iron is generally a process of shrinkage, expansion and re shrinkage. Although the precipitation of graphite can bring volume expansion in the solidification process of ductile iron, due to its paste solidification mode (the precipitation of a large number of dendrites separates the liquid...

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Prevention method of valve casting shrinkage

Shrinkage is the physical nature of the alloy. Under normal pouring temperature, the shrinkage volume of the alloy with fixed composition cannot be changed, but this does not mean that the shrinkage cavity of the casting is inevitable. It has been proved that the compact castings without shrinkage cavity...

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