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Aluminum alloy A356 Chemical Composition and Heat Treatment are frequently encountered in Permanent mold casting; as you know, this material have great yield strength; mechanical properties; and great filling; next, let’s talk about this material and its treatment.
Aluminium Alloy Material is very common in Sand Casting Foundry and permanent mold aluminum castings Foundry. There are 3 Brands, A356.0; A356.1; A356.2. Below please find the Chemical Properties.
| Brand | Si | Mg | Fe | Cu | Zn | Mn | Ti | Ai |
|---|---|---|---|---|---|---|---|---|
| A356.0 | 6.5-7.5 | 0.25-0.45 | 0.2 | 0.2 | 0.1 | 0.1 | 0.2 | Rest |
| A356.1 | 6.5-7.5 | 0.3-0.45 | 0.15 | 0.2 | 0.1 | 0.1 | 0.2 | Rest |
| A356.2 | 6.5-7.5 | 0.3-0.45 | 0.12 | 0.1 | 0.05 | 0.05 | 0.2 | Rest |
| Material | Yield Strength | Fracture Strength | Elongation | Section Shrinkage |
|---|---|---|---|---|
| A356.2 | 216.64MPa | 224MPa | 1.086％ | 0.194％ |
Advantage
Cast ability and high strength, elongation is suitable for thin parts and places where pressure resistance is required, Performance advantages Has good fluidity, no hot cracking tendency, small linear shrinkage, good air tightness and other good casting properties, small specific gravity, good corrosion resistance.
Applications
Various casings, aircraft pump parts, aircraft joints, automotive transmissions, pulleys, fuel tanks, High heat resistance branch stress parts, other machine tool parts.
T2 Annealing
The important position is to remove the inner pressure of the casting (casting pressure and pressure because of machining), stabilize the measurement of the casting, and spheroid the Si crystal of the Al-Si collection alloy to enhance its plasticity. The impact on Al-Si alloy is obvious, the annealing temperature is 280-300 ℃, and the preserving time is 2-4h.
T4 solution treatment (quenching) plus natural aging
By heating and holding, the soluble segment is dissolved, after which quenched, in order that a big variety of strengthening levels are strong-dissolved withinside the α strong strategy to attain a supersaturated strong answer to enhance the hardness, power and corrosion resistance of the alloy. The very last warmth remedy is for Al-Mg collection alloys, and the initial warmth remedy is for different alloys that require synthetic aging.
T5 solution treatment (quenching) plus incomplete artificial aging
It is used to acquire better power and plasticity, however the corrosion resistance might be reduced, specifically the intergranular corrosion might be increased. The ageing temperature is low and the conserving time is short. The ageing temperature is set 150-170 ° C and the conserving time is 3-5h.
T6 solution treatment (quenching) plus full artificial aging
It is used to acquire the best strength, however the plasticity and corrosion resistance are reduced. Performed at better temperatures and for longer durations of time. Suitable for parts requiring excessive load, growing old temperature is set 175-185 ℃, retaining time is extra than 5h.
T7 solution treatment (quenching) plus stabilization tempering
It is used to stabilize the scale and shape of castings, enhance the resistance to corrosion (specifically strain corrosion resistance), and preserve excessive mechanical properties. It is normally completed close to the operating temperature of the part. Suitable for components operating at excessive temperature beneath 300 ℃, tempering temperature is 190-230 ℃, maintaining time is 4-9h.
| 6061-T6 Aluminum | A356. 0 Aluminum | 6082-T6 Aluminum | |
|---|---|---|---|
| Elongation at Break | 10% | 3-6% | 10% |
| Fatigue Strength | 96 MPa | 50-90 MPa | 96 MPa |
| Shear Modulus | 26 GPa | 26 GPa | 26 GPa |
| Ultimate Tensile Strength | 310 MPa | 160-270 MPa | 310 MPa |
| Yield Tensile Strength | 270 MPa | 83-200 MPa | 260 MPa |
| Melting Onset | 580℃ | 570℃ | 555℃ |
| Thermal Conductivity | 170 W/m-K | 150 W/m-K | 180 W/m-K |
| Thermal Expansion | 24 μm/m-K | 21 μm/m-K | 24 μm/m-K |
| Density | 2. 7g/cm3 | 2. 6g/cm3 | 2. 7g/cm3 |
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