Titanium aluminum alloy blade blank continuous cold crucible directional solidification casting device

Abstract

Heat-resistant lightweight titanium alloy blades are needed urgently in aerospace ship power systems, however a traditional directional solidification device can cause serious impurity pollution, and plasticity index of the blades are damaged. For giving play to efficient pollution-free characteristics of an existing cold crucible directional solidification device and overcoming the defect that blades in complicated shapes cannot be solidified directionally, the invention provides a titanium aluminum alloy blade blank continuous cold crucible directional solidification casting device. An upper induction coil used for stimulating an alternating magnetic field is wound on the outer portion of a continuous water-cooling copper crucible, and hot areas are generated through diffusion towards the inner portion of the continuous water-cooling copper crucible through seams. The titanium aluminum alloy blade blank continuous cold crucible directional solidification casting device further comprises a lower drawing rod arranged in a crystallizer, a mold casing with cross section in the shape of a titanium aluminum alloy blade blank is fixed on the upper end face of the lower drawing rod, and the mold casing is heated by an external induction graphite sleeve. The titanium aluminum alloy blade blank continuous cold crucible directional solidification casting device achieves continuous melting, continuous filling and continuous solidification of titanium aluminum alloy, can greatly shorten contact time of high-activity alloy melt and the mold casing, and prevents the titanium alloy blades from being polluted by the mold casing.

Description

technology field [0001] The invention relates to a continuous cold crucible directional solidification casting device. Background technique [0002] one. Background and Significance of the Invention [0003] With the rapid development of social economy, there is an urgent demand for materials and processing technologies with higher performance and special functions. As a sign of the times, aerospace, petrochemical and electric power industries are in great need of high temperature resistance, low density, ultra- Lightweight new material with high strength and high modulus of elasticity. Due to its low density, good oxidation resistance and excellent high temperature performance, titanium aluminum alloy is a kind of material with great potential for high temperature components. Especially titanium aluminum alloy with full lamellar structure (room temperature structure is γ-TiAl+α-Ti 3 Al duplex structure) shows good comprehensive mechanical properties and has attracted p...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that it is difficult to shape directionally solidified structures with complex shapes due to the limitation of the shape of the crucible.

[0034] In summary, the traditional directional solidification method requires long-term contact between the metal melt and the ceramic mold shell. Although the method of directional solidification using a cold crucible avoids the pollution of the metal melt by the mold shell material, it cannot form titanium. Castings with complex shapes such as aluminum alloy blades

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