This aluminum coolant collector for a 15-liter diesel engine was produced in a semi-permanent mold.


aluminum castings often are thermally processed by a series of heating and cooling cycles called heat treatment. T is thermal processing involves three basic operations: solution, quench and age. Combinations of these three heat treat- ments are called tempers (Table 1). T e benefi ts of heat treatment include:


• Homogenization of alloying elements— this is desirable to distribute elements evenly throughout the matrix, so prop- erties in the casting will be uniform;


• Stress relief—residual stresses are created during cooling from elevated


casting and solution temperatures; heating the casting to an intermedi- ate temperature can relieve these residual stresses;


• Improved dimensional stability and machinability—changes in the microstructure can cause castings to grow over time; to maintain tight dimensional tolerances during and after machining, castings should be heat treated to form stable precipi- tate phases;


• Mechanical property improvement— the greatest use of heat treatment is


Bremen Castings, Inc.


•Finished is Machining


•Assembly •Foundr


dry -Gra -Ductile


Gray uct


-High silicon-moly igh ilicon Bremen C emen Castings, Inc nc


500 N. Baltimore Street PO Box 129 Bremen, IN 46506 574-546-2411


www.bremencastings.com


to enhance mechanical and corrosion properties through spheroidizing constituent phase particles and by precipitation hardening. Rarely are all of the desired prop-


erties optimized in a single casting. More often, heat treatment is a com- promise, maximizing some properties at the expense of others. For example, tensile and yield strengths can be increased, but this results in lower elongation. Contrarily, higher elonga- tions result in lower tensile and yield strengths. ■


32 METAL CASTING DESIGN & PURCHASING


2015 CASTING SOURCE DIRECTORY


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