The influence of vibration frequency on the microstructure and properties of gray cast iron in lost foam casting was studied under the conditions of 3mm amplitude, 0,35,50 and 100mm vibration frequency. Cast pig iron, Q235 steel, reheating charge and carburizing agent are used as furnace charge. When molten iron is discharged from the furnace, it is subject to incubation treatment in the ladle. The amount of incubation agent is 0.4% of the weight of molten iron, and the treatment temperature of molten iron is 1510 ° C.
The research mainly evaluates the structure of gray cast iron from the following three aspects:
① Graphite type, distribution and size in gray cast iron;
② Quantity and morphology of primary austenite in gray cast iron;
③ The proportion of pearlitic structure in the matrix and the size of pearlitic sheet spacing.
The analysis software will be used to measure the length of the longest A-type flake graphite sheet in the metallographic structure of gray cast iron, and then divide this value by 100 as the actual length of graphite of gray cast iron. The influence of vibration frequency on graphite morphology, primary austenite and pearlite structure of grizzly cast iron was studied by comparative analysis, and the reason and mechanism of the change of properties of grizzly cast iron by vibration lost foam casting were discussed.