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Casting and heat treatment of ductile iron piston

Ductile iron piston is mainly used in medium speed diesel engine. It is the key component of diesel engine. It needs to bear high compressive stress and thermal alternating load when working, and its working condition is very bad. Because the piston works at high temperature, metal parts are...

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Casting heat treatment process of ductile iron piston

Normalizing ductile iron piston Normalizing, also known as normalizing, is to heat the workpiece to Ac3 or Accm above 30~50 C for a period of time, and then remove the metal heat treatment process from the furnace in the air or spray water, spray or blow cooling. The difference...

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Casting technology of ductile iron piston

The casting properties of ductile iron have the following characteristics ① The content of sulfide and oxide in molten iron is high. In addition, oxides are easily produced if exposed to air and gas. ② Graphitization expansion is easy to cause casting swell, and the dimensional accuracy is easily...

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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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