Technology capable of reducing generation of coarse grains on surface of vehicle extrusion-forged bar

Abstract

The invention belongs to the field of aluminum alloy production technologies, and relates to a technology capable of reducing generation of coarse grains on the surface of a vehicle extrusion-forged bar. An aluminum alloy is prepared from the raw materials in percentage by weight: 1.07-1.12% of Si, less than or equal to 0.1% of Fe, 0.01-0.04% of Cu, 0.62-0.65% of Mn, 0.88-0.93% of Mg, 0.15-0.18% of Cr, less than or equal to 0.03% of Zn, 0.02-0.05% of Ti, less than or equal to 0.03% of a single impurity, less than or equal to 0.1% of an impurity total, and the balance of Al, wherein the ratio of the Mg to the Si is 0.79-0.87. An aluminum alloy cast ingot prepared through the formula is subjected to solid solution heat treatment after extrusion, on-line water spray quenching treatment and stretch straightening, each technological parameter is controlled seriously, after an aluminum alloy extrusion bar is subjected to 545 DEG C*1 h solid solution heat treatment, the section has no the coarse grains, and the surface has no the coarse grains; and after the bar is forged, the thickness of a coarse grain layer of the section is less than or equal to 3 mm, and mechanical performance after170 DEG C*8.5 h can reach: the yield strength RP 0.2 is greater than or equal to 320 Mpa, the tensile strength Rm is greater than or equal to 360 Mpa, and the elongation percentage A is greater than or equal to 10%.

Description

technical field [0001] The invention belongs to the field of aluminum alloy production technology, and relates to a technology for reducing coarse crystals on the surface of extruded forged rods for vehicles. Background technique [0002] The 6-series alloy is the most important press-worked alloy among wrought aluminum alloys. It is an aluminum alloy with magnesium and silicon as the main alloying elements, and its main strengthening phase is the intermetallic compound Mg formed by magnesium and silicon. 2 Si is an aluminum alloy that can be strengthened by heat treatment. The 6 series alloys have medium strength, good plasticity, excellent weldability and corrosion resistance, and no tendency to stress corrosion cracking. Therefore, 6 series alloys are the most widely used aluminum alloys in the world. 6082 aluminum alloy is the main alloy member in the 6-series alloy. 6082 belongs to the Al-Mg-Si series heat treatment can strengthen the aluminum alloy. It has good forma...

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Problems solved by technology

[0004] In view of this, in order to solve the problem that the coarse grains that appear on the surface of the existing 6082 aluminum alloy extruded rod before and after solid solution, the customer will sacrifice the mechanical properties during the subsequent forging process, which affects the use of parts after forging, and provides a method that reduces the Process of Coarse Grain Production on the Surface of Forged Rod by Extrusion

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