Carbon is originally an element of graphite. Increasing the carbon content can increase the homogeneous energy of graphite, increase the undissolved graphite debris in the ferrofluid, increase the inhomogeneous energy of graphite, and thus increase the specific crystallization temperature of the ferrofluid. So carbon, carbon cast iron is the element that drives graphite. However, too much carbon will increase the graphitization level of cast iron, enhance graphite, reduce spheroidal in the substrate, increase the metallographic organization and reduce the mechanical properties of cast iron. In order to improve the strength of cast iron, optimize the graphite in the organization, reduce the quantity and improve the ferrite, the carbon content in cast iron must be moderately reduced.
Investment mold precision casting parts manganese sulfide melting point is high, mainly present in the ferrofluid, low density, beautiful ferrofluid floating, or cast iron with granular inclusions, and then weaken the harmful effects of sulfur. In the production of spherical water glass casting, often use the manganese to sulfur phase offset characteristics to adjust the manganese sulfur ratio, in order to make full use of the harmful effects of manganese phase offset sulfur. The effect of sulfur on the graphitization of cast iron is related to its storage method. If sulfur is present in the form of ternary eutectic or iron-rich sulfate, the low melting point and the diffusion of crystals along crystal boundaries impede the diffusion of iron and oxygen atoms, effectively hindering the development of graphitization.
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