Heat treatment process of low-alloying Al-Mg-Si alloy
A low-alloy, aging heat treatment technology, applied in the direction of improving process efficiency, improving energy efficiency, etc., can solve the problems of free electron directional movement obstruction, increase in strength of difficult alloys, and underutilization, etc., to suppress the second phase coarsening. the effect of
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Embodiment 1
[0026] (1) Extrusion: processing and forming by conventional forward hot extrusion method, controlling the heating temperature and extrusion speed of the billet, so that the alloy temperature of the extrusion die is 530~560°C, preferably, the alloy of the extrusion die The temperature is 530°C, 535°C, 540°C, the best is 545°C;
[0027] (2) Quenching: On-line quenching treatment is carried out by adopting a graded cooling method, that is, the extrusion speed and cooling system are controlled, so that the extruded alloy semi-finished product first travels in the air cooling zone for 5~10s, and then the alloy enters the strong wind rapid cooling zone, and the travel time is 20 ~40s, preferably, the travel time is 30s, and the cooling rate is 6~10°C / s; the alloy is cooled to below 250°C by strong wind quenching, and then air-cooled to room temperature;
[0028] (3) Aging: Two-stage artificial aging treatment is adopted, that is, after straightening and cutting the alloy semi-finis...
Embodiment 2
[0035] (1) Extrusion: processing and forming by conventional forward hot extrusion method, controlling the heating temperature and extrusion speed of the billet, so that the alloy temperature of the extrusion die is 540~555°C;
[0036] Preferably, the alloy temperature at the extrusion die is 540°C, 545°C;
[0037] Optimally, the alloy temperature at the extrusion die is 545°C.
[0038] (2) Quenching: On-line quenching treatment is carried out by adopting a graded cooling method, that is, controlling the extrusion speed and cooling system, so that the extruded alloy semi-finished product first travels in the air cooling zone for 5~10s, and then the alloy enters the strong wind rapid cooling zone, and the travel time is 25 ~35s, can be 25s, 30s, 35s; the cooling rate is 8~10℃ / s; the alloy is cooled to below 250℃ by strong wind quenching, and then air cooled to room temperature;
[0039] Preferably, the extruded alloy semi-finished product first travels in the air cooling zone ...
Embodiment 3
[0047] (1) Extrusion: processing and forming by conventional forward hot extrusion method, controlling the heating temperature and extrusion speed of the billet, so that the alloy temperature of the extrusion die is 550°C;
[0048] (2) Quenching: On-line quenching treatment is carried out by adopting a graded cooling method, that is, the extrusion speed and cooling system are controlled, so that the extruded alloy semi-finished product first travels in the air cooling zone for 5~10s, and then the alloy enters the strong wind rapid cooling zone, and the travel time is 30s , the cooling rate is 6~10°C / s; the alloy is cooled to below 250°C by strong wind quenching, and then air-cooled to room temperature;
[0049] (3) Aging: Two-stage artificial aging treatment is adopted, that is, after straightening and cutting the alloy semi-finished products that have been quenched online, they are placed in a resistance furnace that has been heated to 230°C for primary aging heat treatment, a...
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