Composite toughening technology of cast aluminum alloy wheel hub

Abstract

The invention relates to a composite toughening technology of a cast aluminum alloy wheel hub, comprising the following steps of: melting aluminium alloy melt into an aluminum alloy solution; adding Al-Sr intermediate alloy, mischmetal (Re) and Al-Zr intermediate alloy to the solution when the solution temperature reaches 710-730 DEG C under the condition of stirring to carry out composite modifying and refining treatment; and meanwhile, blowing nitrogen into the solution to remove harmful gas out of the solution. The technology not only can reduce alloy getter and improve the flowability of an aluminum solution, but also can ensure that the tissues and the performance of castings doe not fluctuate, thereby improving the quality of products.

Description

Technical field: [0001] The invention relates to a composite strengthening and toughening technology for cast aluminum alloy wheel hubs. Background technique: [0002] For high-performance aluminum alloy automobile wheels, it is not enough to improve the purity level of molten aluminum only through purification treatment. Modification and grain refinement treatment are also needed to eliminate the influence of impurity elements and coarse crystal structure in aluminum alloy. among them: [0003] The modification is mainly for the eutectic Si in the aluminum alloy. When it is not modified, the eutectic Si appears in the form of thick needles. These thick needles will cause cracks in the aluminum alloy, thereby reducing the mechanical properties of the aluminum alloy and undergoing modification treatment. , Can change the morphology and size of eutectic Si, so that the eutectic Si is transformed from thick needle-like into thin fiber or lamellar. At present, Sr is generally used fo...

AI Technical Summary

Problems solved by technology

However, the phase composition, morphology and distribution of the Al-Ti-B refiner are extremely sensitive to factors such as the structure, solidification and solid-state treatment of the aluminum alloy melt, resulting in large differences in the microstructure and refinement effect, that is, in completely the same Under the conditions of alloy composition and casting process, due to the difference in the structure of the micro-auxiliary materials used, the structure and performance of aluminum products fluctuate unpredictably, and it is difficult to control the production quality of aluminum products.