回答：
Influence of Factors on White Cast Iron Aperites Original Austrian State
White cast iron is composed of austenite, ferrite, and some carbides, so the shape of white cast iron after solidification is closely related to the proportions of these components. The shape of white cast iron aperite or austenite will affect its mechanical properties and service life. Therefore, the factors that affect the original shape of white cast iron austenite are worth studying.
First, the composition of white cast iron has an important impact on the shape of the austenite, especially the carbon equivalent and silicon equivalent composition.
The higher the carbon equivalent and silicon equivalent in white cast iron, the more prone it is to produce austenite pearlite structure. The austenite pearlite structure is fine and the strength is strong, but the plasticity is relatively low. When the carbon equivalent is low and the silicon equivalent is high, the austenite primary body structure tends to form a white cast iron aperite containing a large amount of austenitic film, which has high plasticity, but low strength.
Second, after the white cast iron is poured, its cooling rate has a great influence on the shape of the austenite.
When the cooling rate is low, the transformation of austenite and iron carbide is slow, and the austenite film is abundant and uniform. When the cooling rate is high, the proportion of pearlite increases, which is conducive to the precipitation of iron carbide particles, so that the pearlite does not increase and the austenite film is reduced.
Third, the austenite grain size also affects the molding of white cast iron austenite.
As the austenite grain size increases, the amount of austenite film observed by optical microscope increases. The grain size of the austenite after the casting of white cast iron is small at the same cooling rate, and the austenite film observed by the optical microscope is large.
Fourth, the nitrogen content in the molten steel has an important influence on white cast iron aperite.
At a given cooling rate, when the nitrogen content in the molten steel is high, the transformation of austenite and austenite pearl is slow, the austenite grain size is coarse, and the optical microscope can observe more austenite films.
Fifth, white cast iron has a certain degree of sensitivity to steelmaking.
If the temperature control of steelmaking is improper, unstable and even over-temperature, the austenite grain size will increase, the austenite film will increase, and more pearlite will form, so it is easy to cause the shape of white cast iron aperite to change.
These were the main factors that influence the shape of white cast iron aperite. By controlling the above factors and choosing suitable steelmaking technology and cooling mode, stable production of white cast iron can be achieved.
