This aluminum coolant collector for a 15-liter diesel engine was produced in a semi-permanent mold.
high polish or anodized finish, are typical uses. In many cases, this alloy has replaced gray iron and malleable iron because it reduces weight with- out sacrificing strength. Alloy 712—Alloy 712 is employed when a combination of good mechani-
cal properties without heat treatment is needed. It also shows good shock and corrosion resistance, machinability and dimensional stability. No distortion is exhibited when 712 is heated. After brazing, the alloy will regain its original strength by natural aging.
The alloy is used for marine cast-
ings, farm machinery, machine tool parts and other applications in which the part must have good strength or impact resistance.
Design Considerations Aluminum alloy selection cannot be
done until the component’s application and end-use requirements are defi ned. T e range of possible mechanical properties varies widely because there are many alloy and thermal treatment combinations. For example, many com- mercial castings do not have critical service requirements; therefore, a more economical alloy and production method can be utilized. If high strength is required, heat-
treatable alloys must be used. T e alloy options can be narrowed further when considering the remaining require- ments, such as pressure tightness, corro- sion resistance and machinability. Design complexities can have vari-
ous eff ects on component cost. In some cases, the fi nished component cost can be reduced by including features in the design that will produce a near-net- shape cast part and eliminate or mini- mize additional costs from post-casting processes, such as machining. However, features like complexity and surface fi nish or special properties can increase the cost of the casting. It also might be advantageous to redesign a casting for a lower cost process, such as permanent mold or diecasting. To improve properties and enhance
strength and ductility, aluminum castings often are thermally processed by a series
30 METAL CASTING DESIGN & PURCHASING 2014 CASTING SOURCE DIRECTORY
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