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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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Solidification characteristics of ductile iron casting

Nodular cast iron (ductile iron for short) is the 50th century A kind of high strength cast iron developed in the S. after spheroidizing and inoculation, carbon atoms precipitate in the form of spheroidal graphite and are evenly distributed in the middle of ferrite structure (Fig. 1), which can...

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Selection of riser position for ductile iron castings

The design of feeding system is the key content of this paper. We discussed the main factors that affect the shrinkage porosity of casting, which are hot metal quality, mold strength and mold technology. The quality of molten iron is greatly affected by the quality of raw materials, the...

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Corrosion resistance of high nickel ductile iron

The surface of high nickel ductile iron samples during corrosion process was observed. The results are similar to that of high silicon molybdenum ductile iron. No obvious bubbles were found on the surface of the samples. After testing, the surface basically maintains the original metallic gloss. No point corrosion...

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Corrosion resistance of high silicon molybdenum ductile iron

By observing the surface of the sample during the corrosion process, no obvious bubbles were found on the surface of the sample. The surface of the test basically maintains the original metallic gloss, and no pitting corrosion and corrosion cracks were found. The corrosion is relatively uniform, which indicates...

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