Modificator for changing growth morphology of primary austenite of gray cast irons, preparation method and application thereof
A gray cast iron and modifier technology, applied in the field of modifiers, can solve problems such as shrinkage porosity, large shrinkage of molten iron, and poor casting process performance
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[0020] 1. Melting in a 500Kg power frequency melting furnace, thermocouple temperature measurement, molten iron temperature 1530°C, inoculated and deteriorated in the ladle, fully stirred and poured in the resin sand mold for tensile strength measurement and tissue analysis samples, sample size Φ30mm ×300mm. The amount of modificator added is 0.3% to 0.6%. The composition of the tested alloy is shown in Table 1.
[0021] Table 1 Chemical composition of test alloys
[0022]
[0023] Figure 1~4 To test the microstructure of gray cast iron after austenitizing annealing. Among them, the black strips are graphite, the bright white ones are primary austenite structures, and the gray-black ones are pearlite structures.
[0024] It can be seen that in the sample A that does not add the modificator of the present invention ( figure 1 ), the graphite is evenly distributed, almost no obvious eutectic group can be seen, or the size of the eutectic group is very large, and a compl...
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