Aluminum alloy material for hot precision forging connection rod and preparation method thereof

Abstract

The invention discloses an aluminum alloy material for a hot precision forging connection rod. The aluminum alloy material comprises the following components in percentage by weight: 0.6-1.2% of Si, 0.1-0.7% of Fe, 3.8-4.7% Cu, 0.4-1% of Mn, 0.4-0.8% of Mg, 0.01-0.3% of Zn, 0.01-0.15% of Ti, 89.5-93.6% of Al, 0.05-0.1% of impurities and 0.65-1.45% of a rare earth composite additive containing a mixture of Re, Er and Zr. The rare earth composite additive is the mixture of Re, Er and Zr. The Re contains 75-80% of Ce and 20-25% of La. The invention also discloses a preparation method of the material, comprising the following steps: smelting at the temperature of 710-750 DEG C; adding the rare earth composite additive into the solution, stirring, preserving heat and pouring; fetching out the casting and forging at 400-420 DEG C; and finally performing annealing, solution treatment, quenching and artificial aging. The invention has the advantage that the mechanical performance of the casting by forging at low cost.

Description

technical field [0001] The invention relates to a nonferrous alloy material and a preparation method thereof, in particular to an aluminum alloy material for hot precision forging connecting rods and a preparation method thereof. Background technique [0002] The connecting rod is the main moving part of the piston diesel engine, gasoline engine and compressor. One end is connected to the crankshaft, and the other end is connected to the piston through the piston pin. The quality of the connecting rod directly affects the performance of the whole machine. From the perspective of performance parameters such as specific strength and specific modulus, the materials suitable for making connecting rods are titanium, magnesium, aluminum and iron. For civil engines, the main factor restricting the selection of connecting rod materials is price. Among the above-mentioned metal materials, aluminum has low density, light weight, high strength, and the cheapest price. Therefore, alumi...

AI Technical Summary

Problems solved by technology

[0003] The present invention mainly aims at the defects of coarse grain, poor plasticity, low strength, poor toughness and inability to forge existing aluminum alloy castings, and proposes a method of adding a small amount of rare earth alloy to the aluminum alloy melt to denature it to form a hot precision forging connecting rod. Aluminum alloy material is used for castings with refined grains, dense metallographic structure, wear resistance and corrosion resistance, and can significantly improve strength and toughness after forging