The heat treatment process of Si Mn alloyed ductile iron is similar to that of other ductile iron, which can be generally divided into three stages: heating, quenching, tempering or isothermal. The heating process curve is shown in Figure 1. The heating at the low temperature stage shall be...
The quenching medium used for nodular cast iron grinding ball should have the following two characteristics: 1) The quenching medium has a fast cooling rate at the high temperature stage of the grinding ball; 2) The quenching medium has a slow cooling rate at the low temperature stage of...
In order to overcome the shortcomings in the traditional production of ADI grinding balls, it is necessary to find cheap alloy combinations from materials to replace Mo, Cu and other precious alloy elements. Through years of practice, research and improvement, the production of nodular cast iron grinding balls with...
In recent ten years, based on the research on the development of grinding ball materials at home and abroad, China has developed a kind of ductile iron material to make ball mill grinding balls, which has achieved remarkable results. Among them, Si Mn alloyed ductile iron grinding balls and...
Fig. 1 a) ~ F) shows the change process of mold filling temperature field of top injection trial production scheme. Similarly, figure a) shows that only 0.135 seconds of molten metal fills the hollow sprue. Since the top injection hollow sprue is shorter than the bottom injection, the filling...
Fig. 1 is a sectional view of the solidification time distribution during bottom injection. It can be seen that the slag inclusion riser, fork tip and sprue solidify the earliest and the solidification time is the shortest; The solidification time at the junction of the two fork arms and...
Figure 1 a) ~ g) shows the change process of mold filling temperature field of bottom injection trial production scheme. Figure a) it can be seen that the molten metal is filled with hollow runner just for 0.17 seconds, and the high temperature metal starts to connect with the...
By individually adjusting the corresponding parameters of the example, we can intuitively understand the influence of these conditions on the accuracy of the judgment results of shrinkage cavity and porosity of nodular iron. 1) Comparison with uncoupled micro Set the micro switch to 0 (off) and 1 (on) respectively....
Graphite expansion will occur in the solidification process of iron castings. While the liquid metal shrinks, the graphite expansion in the mold can play the role of feeding. How about the effect of this expansion and feeding? We can simulate it in two ways with ProCAST. The first is...
The metallographic samples of nodular cast iron No. 1 ~ 3 nodular cast iron corroded by 4% nitric acid alcohol solution are magnified by 100 times and 500 times, as shown in Fig. 1 (a) ~ (f). The structure of nodular cast iron studied is composed of pearlite, ferrite...