High elongation rate and high-strength alloy aluminium end cap for multiple unit and casting method thereof

Abstract

The invention discloses a high-extensibility and high-strength alloy aluminum end cover used for multiple units, and a casting method thereof; the material consists of components in the following weight percent: 3.5 percent to 4.5 percent of Mg, 0.2 percent to 0.4 percent of Cu, 0.1 percent to 0.2 percent of Ti, equal to or less than 0.1 percent of Zn, equal to or less than 0.21 percent of Fe, equal to or less than 0.6 percent of Mn, equal to or less than 0.1 percent of Ni, equal to or less than 0.1 percent of Pb, equal to or less than 0.15 percent of Si, and the rest is Al. The invention is a high-extensibility and high-strength alloy aluminum end cover used for multiple units which has quite good high-temperature mechanical property and extensibility, and can bear quite heavy load; the casting method of the end cover has low cost and is easy to be controlled.

Description

Technical field [0001] The invention relates to a high-elongation and high-strength alloy aluminum end cover of an EMU. The invention also relates to a casting method of the high-elongation and high-strength alloy aluminum end cover of the EMU. technical background [0002] At present, the non-transmission end cover and middle end cover of the traction motor of the EMU with a speed of 300 kilometers per hour developed in our country, the working conditions are: the working temperature is below 150 ℃, it needs to bear a certain dynamic load, and it needs to be able to resist roadside flying stones The striking ability requires that it has good high temperature mechanical properties and elongation, and can withstand larger loads. Aluminum-magnesium cast aluminum alloy is a metal material with excellent corrosion resistance, cutting performance and welding performance, so it is widely used in aerospace, aviation, marine vessels, food machinery and other fields. At present, the alumi...

AI Technical Summary

Problems solved by technology

The former type can be strengthened by heat treatment to obtain higher comprehensive mechanical properties, and its mechanical properties can reach σb≥280 (MPa), δ5≥8%, but the casting performance of this type of alloy is very poor, and the smelting process is relatively poor. Complex, so its production is difficult and the cost is relatively high

The latter type of alloy cannot be strengthened by heat treatment, so its mechanical properties are not high, σb≥150 (MPa), δ5≥1%, but the casting performance is better than the former type, and the production cost is lower

Images