An alloy with good hot formability, corrosion resistance, fatigue properties, toughness and weldability

Abstract

The invention relates to the field of aluminum alloys, more specifically an alloy with good thermoformability, corrosion resistance, fatigue performance, toughness and weldability, which consists of the following components: Mg0.6-0.65 wt%, Mn0. 08‑0.25wt%, Cr0.1‑0.2wt%, Si0.70‑0.75wt%, Fe 0.005‑0.2wt%, Cu 0.02‑0.07wt%, Zn<0.1wt%, Ti 0.02‑0.05wt%, V0 .07-0.12 wt%, and the balance is Al and unavoidable impurities. The beneficial effect of the present invention is: the aluminum alloy of the present invention changes the type and content of alloying elements, so that the crystal grains in the alloy of the present invention are more refined, and the structure is more refined. Uniformity, thereby improving the machining performance of the alloy, and through the interaction and coordination between the alloys, the hot formability, corrosion resistance, fatigue performance, toughness and welding performance of the alloy are greatly increased.

Description

technical field [0001] The invention relates to the field of aluminum alloys, in particular to an alloy with good thermal formability, corrosion resistance, fatigue performance, toughness and welding performance. Background technique [0002] The density of pure aluminum is small (ρ=2.7g / cm3), about 1 / 3 of that of iron, and its melting point is low (660°C). Aluminum has a face-centered cubic structure, so it has high plasticity (δ: 32~40%, ψ: 70~90%), easy to process, can be made into various profiles and plates, and has good corrosion resistance; but the strength of pure aluminum is very low, and the σb value in the annealed state is about 8kgf / mm2, so it is not suitable for structural materials. Through long-term production practice and scientific experiments, people have gradually strengthened aluminum by adding alloy elements and using heat treatment. This has resulted in a series of aluminum alloys. Aluminum alloys are the most widely used non-ferrous metal structural m...

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Problems solved by technology

[0003] However, different requirements have different performance requirements for aluminum alloys, such as high-strength aluminum alloys, high-toughness aluminum alloys, corrosion-resistant aluminum alloys, easy-to-weld aluminum alloys, etc., and for aluminum alloys used for high-speed train body profiles, Due to its practical environment and use position, it needs good thermoformability, corrosion resistance, fatigue performance, toughness and welding performance, but there is no alloy with such comprehensive properties at present.

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