Properties and casting temperature requirements of superalloy castings shared by Steel Casting Bearing Housing Manufacturer.
The pouring temperature of superalloy castings is lower, generally 700 ~ 800mm in the length of helical line at 680℃. Aluminum alloy is easy to be aspirated and oxidized at high temperature, which affects its mechanical properties.
Properties of superalloy casting:
In the process of production of high temperature alloy casting, the technological performance presented is called casting performance, which is an important factor to ensure casting quality to some extent. The casting performance of the alloy mainly has fluidity, shrinkage, segregation tendency and so on.
Fluidity the flow capacity of a molten metal is called fluidity. Liquid metal with good fluidity and strong filling ability, it is easy to obtain castings with complete shape, accurate size, clear outline or thin and complex wall.
There are many factors affecting metal fluidity, such as high casting temperature, which can keep metal in liquid state for a long time, but too high casting temperature will lead to the increase of total shrinkage of metal and excessive absorption of gas, resulting in shrinkage cavity, porosity and other defects. In short, pouring temperature should not be too high and too low. Alloy composition also has a great influence on fluidity, such as eutectic alloy with low melting point and good fluidity.
2. Steel Casting Company in China shares that the property of shrinking metal when it cools is called shrinkage. The contraction of metals can be divided into three parts: liquid contraction, solidification contraction and solid contraction. Among them, the liquid shrinkage is produced at high temperature, which only causes the metal liquid level of the casting riser to decrease. Solidification shrinkage will cause shrinkage porosity, shrinkage cavity and other phenomena. When solid state shrinkage is hindered, casting internal stress is generated. In order to prevent shrinkage porosity or shrinkage cavity, the inner runner should be enlarged, and the runner should be used to directly feed, or the riser should be set at the wall thickness, and the solidification shrinkage at the wall thickness should be supplemented by the metal liquid in the riser.
3. Segregation tendency the phenomenon of uneven chemical composition of metal or alloy formed in the solidification process is called segregation. It is related to the temperature interval between liquid and solid phase lines of the alloy. In addition, when the content of sulfur, phosphorus and carbon in gray cast iron is high, it is easy to produce segregation. Segregation can also be caused by high pouring temperature and slow cooling rate. When casting segregation is not serious, it can be eliminated by annealing treatment.
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