A heat treatment method for lead-free free-cutting aluminum alloy extruded rods
A heat treatment method and aluminum alloy technology, applied in the field of metal heat treatment, can solve the problems of increasing the production cost of aluminum alloy extruded bars, reducing the production efficiency of lead-free free-cutting aluminum alloy extruded bars, and consuming large energy.
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Embodiment 1
[0040] A lead-free free-cutting aluminum alloy extruded rod, composed of the following components by mass percentage: Mg 1.45%, Si1.26%, Cu 1.36%, V0.07%, Sb 0.17%, Ba0.25%, Ga0. 68%, Rb 0.24%, Fe 0.14%, the balance is Al and unavoidable impurity elements, the individual content of impurity elements is ≤0.05%, and the total amount of impurity elements is ≤0.15%;
[0041] The heat treatment method for lead-free free-cutting aluminum alloy extruded rods includes the following steps in sequence:
[0042] (1) Heat the extruded aluminum alloy bar to 405°C at a heating rate of 20°C / min and hold it for 15 minutes, then continue to heat it up to 545°C at a heating rate of 15°C / min and hold it for 25 minutes, then quench the water Cool to room temperature;
[0043] (2) Heat the aluminum alloy extruded bar to 215°C at a heating rate of 20°C / min and hold it for 30 minutes, then cool it down to 190°C at a cooling rate of 10°C / min and hold it for 2.5 hours, then cool to room temperature ...
Embodiment 2
[0045] A lead-free free-cutting aluminum alloy extruded rod, composed of the following components by mass percentage: Mg 1.49%, Si1.23%, Cu 1.39%, V0.05%, Sb 0.19%, Ba0.22%, Ga0. 71%, Rb 0.21%, Fe 0.16%, the balance is Al and unavoidable impurity elements, the content of individual impurity elements is ≤0.05%, and the total amount of impurity elements is ≤0.15%;
[0046] The heat treatment method for lead-free free-cutting aluminum alloy extruded rods includes the following steps in sequence:
[0047] (1) Heat the extruded aluminum alloy bar to 400°C at a heating rate of 20°C / min and hold it for 10 minutes, then continue to heat it up to 550°C at a heating rate of 15°C / min and hold it for 20 minutes, then quench the water Cool to room temperature;
[0048] (2) At a heating rate of 20 °C / min, heat the aluminum alloy extruded rod to 220 °C and keep it for 25 minutes, then cool it down to 195 °C at a cooling rate of 10 °C / min and keep it for 2 hours, then cool to room temperatu...
Embodiment 3
[0050] A lead-free free-cutting aluminum alloy extruded bar, consisting of the following components by mass percentage: Mg 1.43%, Si 1.29%, Cu 1.34%, V 0.09%, Sb 0.19%, Ba0.27%, Ga 0.66% , Rb 0.26%, Fe 0.12%, the balance is Al and unavoidable impurity elements, the individual content of impurity elements is ≤0.05%, and the total amount of impurity elements is ≤0.15%;
[0051] The heat treatment method for lead-free free-cutting aluminum alloy extruded rods includes the following steps in sequence:
[0052] (1) Heat the extruded aluminum alloy bar to 410°C at a heating rate of 20°C / min and hold it for 20 minutes, then continue to heat it up to 540°C at a heating rate of 15°C / min and hold it for 30 minutes, then quench the water Cool to room temperature;
[0053] (2) Heat the aluminum alloy extruded bar to 210°C at a heating rate of 20°C / min and hold it for 35 minutes, then cool it down to 185°C at a cooling rate of 10°C / min and hold it for 3 hours, then cool to room temperatur...
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