TORQUE TEST FOR EVALUATING THE QUALITY OF ALUMINUM ALLOY MELTS,
FRANKFORD ARSENAL PHILADELPHIA PA PITMAN-DUNN RESEARCH LABS
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A preliminary development of a cast torque specimen has been made for evaluating the quality of an aluminum alloy. The approach was to design the specimen, develop a testing procedure, and correlate the test results with those obtained with companion, separately cast-to-size, tensile bar specimens. The developed torque specimen was cast to size using a resin-bonded shell mold, and tested using an indicating torque wrench. It was found that the torque data reproducibility is equivalent to the reproducibility observed for separately cast tensile bars. In general, heat-treated T6 torque and tensile specimens reflect artificially produced variations in the gas and magnesium contents of A356 alloy. As-cast specimens of A356 alloy are relatively insensitive to these variations in melt quality. It was recommended that further work be conducted to 1 monitor heat treatment of aluminum castings 2 improve the sensitivity of the test to permit melt quality evaluation on the basis of as-cast test specimens.
- Metallurgy and Metallography
- Fabrication Metallurgy