High-strength toughness aluminum brass alloy and manufacturing method thereof

Abstract

The invention relates to a high-strength toughness aluminum brass alloy and a manufacturing method of the high-strength toughness aluminum brass alloy. The chemical composition of the alloy comprises,by weight, 63-68% of copper, 2-4% of iron, 5-7.5% of aluminum, 2.5-5% of manganese, 1-6% of nickel 0.02-0.1% of yttrium, vanadium and boron, and the balance zinc (containing other inevitable impurities with the content smaller than or equal to 0.5%). Aluminum and copper are added in sequence for alloy smelting, it is ensured that the amount ratio of copper to aluminum is smaller than or equal to2, heating smelting is carried out, the density of the alloy liquid formed by copper and aluminum is smaller than or equal to 7g / cm<3>, in this way, aluminum film covering protection is achieved, manganese can be conveniently immersed in the alloy melt for melting, copper-manganese alloy is formed at first, iron dissolving is added after the temperature is increased, and hard brittle iron-rich particles are reduced or eliminated. An alloy casting has high hardness, has high strength, high hardness, high ductility and good wear resistance, and is widely applied to parts such as bearings, shaftsleeves, thrust nuts and the like which are difficult to lubricate and replace.

Description

technical field [0001] The invention relates to a complex aluminum-brass alloy and a manufacturing method thereof, in particular to a high-strength and toughness aluminum-brass alloy and a manufacturing method thereof. Background technique [0002] Complex aluminum brass has high strength, generally up to 760Mpa, and can withstand high loads. At the same time, the hardness HB is over 160, so it has good wear resistance and is widely used in bearings, shaft sleeves, thrust nuts and other parts that are not easy to lubricate and replace. . Due to the high zinc equivalent of multi-component complex aluminum brass, the casting grains are coarse, in addition to the α phase, there are a large amount of hard β phase in the structure, and there is also a small amount of γ brittle phase. Therefore, castings such as bearings, bushings, and nuts in the general complex aluminum-brass casting state have sufficient strength and hardness, but insufficient strength and toughness, difficult...

AI Technical Summary

Problems solved by technology

Therefore, castings such as bearings, bushings, and nuts in the general complex aluminum-brass casting state have sufficient strength and hardness, but insufficient strength and toughness, difficult machining, and sometimes fracture, which also affects the anti-adhesive wear performance of castings such as thrust nuts. and service life

[0003] Chinese patent CN201810998830.6 discloses a high-strength, toughness and corrosion-resistant aluminum brass alloy, clearly pointing out that adding an appropriate amount of aluminum to the alloy can significantly improve the strength and corrosion resistance of the material, and the Al weight content exceeding 2% will significantly improve The strength and hardness of the alloy material, but the hard and brittle γ phase appears in the alloy, which greatly reduces the plasticity of the alloy and deteriorates the toughness, so the best choice is 0.8-2%

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