You are working for an automobile manufacturer making automatic transmission hou

Question

You are working for an automobile manufacturer making automatic transmission housings using permanent mold casting. The alloy that you are using is A356 Aluminum, a standard casting alloy. Your boss tells you that they normally specify a T6 temper for the alloy because the material operates at slightly elevated temperatures. Since you are new to the company, he wants you to do the following: Determine the composition limits for this material. Determine the expected properties (sigma_ult, sigma_y and percent elongation for A356-T6 material. Specify the appropriate casting temperature for the material and give the reasoning behind your choice. Specify the appropriate heat treatment for the transmission housings to give the above properties. Give the references for any information that you use from other sources.

Explanation / Answer

a) Strandard composition limits of A356 Aluminium:

0.25 Cu max, 0.20 to 0.45 Mg, 0.35 Mn max,6.5-7.5 si, 0.6 Fe max, 0.35 Zn max, 0.25 Ti max, 0.05 others(each)max, 0.15others(total)max

b) Expected properties:

Elongation (%) = 2

Endurance limit = 56

Tensile stress (N/mm) = 230

c)Thermal properties :

Liquidus temperature = 615°c

Solidus temperature = 555°c

Specific heat = 963 J/kgk

Latent heat of fusion = 389 kJ/kg

d) Heat treatment:

Solution heat treatment , quench and artificial age. Such heat treatment usually results in high tensile strength and yield strength with adequate elongation

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