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Duplex process and crystal structure of superalloy castings

Released on Sep. 06, 2019

Duplex process and crystal structure of superalloy castings

Steel Casting Pump Body during the operate its manufacturing technology and processing technology constantly improve and develop, such as its thermal control solidification, fine crystal technology, such as the laser forming repair technology, wear-resistant metal casting technology, the original technical level enhances unceasingly perfect so as to improve the quality of all kinds of high temperature alloy casting product consistency and reliability.

High temperature alloy castings in the use of no or less containing Aluminum Casting, titanium high temperature alloy casting, generally use arc furnace or non-vacuum induction furnace smelting. High temperature alloys containing aluminum and titanium, such as melting in the atmosphere, the element loss is not easy to control, gas and inclusions into more, so it should be used vacuum smelting. In order to further reduce the inclusion content, improve the distribution of inclusion and the crystal structure of the ingot, the combined process of smelting and secondary remelting can be used. The main means of smelting are arc furnace, vacuum induction furnace and non-vacuum induction furnace. The main means of remelting are vacuum consumptive furnace and electroslag furnace.

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Forging can be used for the solid solution strengthened alloy of superalloy casting and alloy ingot with low content of aluminum and titanium (the total amount of aluminum and titanium is less than 4.5%). Alloys containing high levels of aluminum and titanium are generally extruded or rolled, and then hot rolled into products, some products need further cold rolling or cold drawing. Larger diameter alloy ingots or cake materials need to be forged by hydraulic press or fast forging hydraulic press.

In order to reduce or eliminate grain boundaries perpendicular to the stress axis and to reduce or eliminate porosity in Aluminum Casting Pump Housing, directional crystallization technology has been developed in recent years. In this process, grains grow in one direction during the solidification of the alloy to obtain parallel columnar crystals without transverse grain boundaries. The primary process conditions for the realization of directional crystallization are to establish and maintain a sufficiently large axial temperature gradient and a good axial heat dissipation condition between the liquid-phase line and the solid-phase line. In addition, in order to eliminate all grain boundaries, it is necessary to study the manufacturing technology of single crystal blade.


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