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, lets talk about this material and its treatment
A356(AlSi7Mg0.3) aluminum alloy chemical composition
Aluminium Alloy A356(AlSi7Mg0.3) Mechanical Properties
|Material||Yield Strength||Fracture Strength||Elongation||Section Shrinkage|
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.
Various casings, aircraft pump parts, aircraft joints, automotive transmissions, pulleys, fuel tanks,High heat resistance branch stress parts, other machine tool parts.
Heat treatment status code and meaning for casting aluminum alloy
T1 Artificial aging
For alloys cast in metal molds or wet sand molds, due to the rapid cooling rate, a certain degree of supersaturated solid solution has been obtained, already have partial quenching effect. after artificial aging and desolation strengthening; can increase the hardness and mechanical strength; also can improve the machinability.
The main role is to eliminate the internal stress of the casting (casting stress and stress caused by machining), stabilize the dimension of the casting, and spheroid the Si crystal of the Al-Si series alloy to improve its plasticity. The effect on Al-Si alloy is obvious, the annealing temperature is 280-300 ℃, and the holding time is 2-4h.
T4 solution treatment (quenching) plus natural aging
By heating and holding, the soluble phase is dissolved, and then quenched, so that a large number of strengthening phases are solid-dissolved in the α solid solution to obtain a supersaturated solid solution to improve the hardness, strength and corrosion resistance of the alloy. The final heat treatment is for Al-Mg series alloys, and the preliminary heat treatment is for other alloys that require artificial aging.
T5 solution treatment (quenching) plus incomplete artificial aging
It is used to obtain higher strength and plasticity, but the corrosion resistance will be reduced, especially the inter-granular corrosion will be increased. The aging temperature is low and the holding time is short. The aging temperature is about 150-170 ° C and the holding time is 3-5h.
T6 solution treatment (quenching) plus full artificial aging
It is used to obtain the highest strength, but the plasticity and corrosion resistance are reduced. Performed at higher temperatures and for longer periods of time. Suitable for parts requiring high load, aging temperature is about 175-185 ℃, holding time is more than 5h.
T7 solution treatment (quenching) plus stabilization tempering
It is used to stabilize the size and structure of castings, improve the resistance to corrosion (especially stress corrosion resistance), and maintain high mechanical properties. It is usually carried out near the working temperature of the part. Suitable for parts working at high temperature below 300 ℃, tempering temperature is 190-230 ℃, holding time is 4-9h.
What is the difference between 6061 and 6082? aluminium alloy a356 and 6082?
|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|
|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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