Different from equilibrium solidification, the solidification process of alloy melt under pressure is controlled by nucleation and subsequent crystal growth. […]
It has been proved that different types of carbides have different hardness. The purpose of different casting processes is to
Besides discussing the interface structure, which is the mechanism of atom stacking and crystal morphology, we also need to discuss
Crystal growth is a process in which the atoms in the liquid phase migrate and stack to the surface of
From the point of view of thermodynamics, primary carbides should only exist in hypereutectic alloy. But in fact, it can
Because the composition of low chromium white cast iron alloy 1 is far away from eutectic point, the carbides are
In the solidification process of Hypoeutectic chromium white cast iron, the primary phase is austenite, the carbides in the solidification
The total amount of carbides, eutectic carbides and primary carbides in alloy 2 are shown in the figure. The content
In order to better compare the solidification structures of different sampling positions under different pressures, the solidification structures of top,
(1) Solidification structure of specimens at different positions under atmospheric pressure The solidification structure of alloy 2 under normal pressure
The results show that the pressure, fluidity and cooling rate of liquid metal at different positions are different during solidification.
The stability of solid-liquid interface affects the morphology of microstructure and determines the final properties of materials. The expression of
The relationship between pressure and solute diffusion coefficient can be described as follows Where: DP — solute diffusion coefficient under
Through the characterization and analysis of the morphology of the above hypoeutectic alloy 1 # eutectic structure, the eutectic morphology
Because the primary phase in the solidification structure of alloy 1 is austenite, the eutectic austenite in the divorced eutectic
Through the quantitative characterization of eutectic structure under different pressures, it can be seen that the morphology of each phase
The metallographic structure shown in the figure is the metallographic structure photo of near eutectic alloy 2. It can be
1. Hardness test (1) Macrohardness Thbrv-187.5 electric broville hardness tester is mainly used for macro hardness analysis of samples. As
1. Sample preparation (1) Sample grinding and polishing Use pg-2da metallographic sample polishing machine to pre grind the sample with
1. Alloy melting The alloy was melted in 500 kg medium frequency induction furnace in air atmosphere. The raw materials
The main equipment of pressure casting experiment includes liquid die forging machine, special concave convex die, pouring ladle and pouring
The raw materials used in the experiment are two kinds of alloy composition, including low chromium hypoeutectic white cast iron
The purpose of this study is to modify the solidification structure of chromium white cast iron by pressure casting. The
The solid-liquid phase transition process changes greatly under pressure. With the increase of the temperature of the solid-liquid phase line,
The effects of pressure on solidification structure, including nucleation rate, undercooling and diffusion coefficient of alloy elements, provide a good
The solidification process can be regarded as a binary system with solid-liquid two-phase equilibrium. The degree of freedom of the
Many studies have shown that the tool life of cutting vermicular graphite cast iron is 1/10 of that of cutting
Uniform and stable coating composition is the basis to ensure the coating process performance, which belongs to static control for
For different casting defects (such as sand sticking, porosity, sintering, veining, shrinkage porosity at hot spot, etc.), the foundry should
The gray cast iron cylinder body adopts the traditional horizontal pouring process, the sand core is dipped with coating respectively
