From the point of view of thermodynamics, primary carbides should only exist in hypereutectic alloy. But in fact, it can also be observed in the near eutectic alloy 2 #. According to the previous research results, this may be due to the left shift of eutectic point caused by...
Pressure casting is an advanced near net shape casting process. The melt bears high pressure after pouring and filling until the casting is completely solidified. Compared with machining, pressure casting greatly reduces the production cost and has superior production efficiency. Pressure casting technology is often used to manufacture parts...
1. Hardness test (1) Macrohardness Thbrv-187.5 electric broville hardness tester is mainly used for macro hardness analysis of samples. As the sample is chromium white cast iron, HRC Rockwell hardness should be used to test. Check the hardness meter with standard hardness block, and the hardness value checked shall...
1. Sample preparation (1) Sample grinding and polishing Use pg-2da metallographic sample polishing machine to pre grind the sample with metallographic sandpaper, and wash the sample with water continuously during the process to keep the grinding surface free of foreign matters. After the pre grinding, the steel special polishing...
1. Alloy melting The alloy was melted in 500 kg medium frequency induction furnace in air atmosphere. The raw materials used in the experiment are alloy, including 20CrMnTi scrap, high carbon ferrochromium, high carbon ferromanganese, ferromolybdenum and carburizing agent. In the smelting process, the temperature is controlled at 1480...
The main equipment of pressure casting experiment includes liquid die forging machine, special concave convex die, pouring ladle and pouring chute. The hydraulic forging machine is y32-1600t four column vertical liquid forging machine designed and manufactured by Hebei Hongkai Heavy Machine Tool Co., Ltd. its appearance is shown in...
The raw materials used in the experiment are two kinds of alloy composition, including low chromium hypoeutectic white cast iron (alloy 1) and high chromium eutectic white cast iron (alloy 2). In order to reduce the difference of alloy composition caused by different heats, each kind of alloy is...
The purpose of this study is to modify the solidification structure of chromium white cast iron by pressure casting. The effect of solidification pressure on the solidification structure of the alloy was studied, especially on the morphology and distribution of carbides. Secondly, the effect of solidification pressure on the...
The solid-liquid phase transition process changes greatly under pressure. With the increase of the temperature of the solid-liquid phase line, the eutectoid transition point moves to low temperature, the carbon content decreases, and new phases and phase regions appear, which changes the properties of the known phases and the...
Pressure casting is a method that liquid or semi-solid alloy melt is pressed into the mold cavity at high speed under the action of high pressure, and the melt is solidified under pressure, so as to obtain the casting with accurate size and clear outline. Magnesium alloy is especially...