An elastic recovery test for recrystallization
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The authors are thankful to Professor S.P. Sen Gupta for his active interest in the work.
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An Elastic Recovery Test for Recrystallization JOHN W. PUGH and LAURA K. M c W H O R T E R Metallurgical technology continually requires the measurement of thermal treatment effects on microstructure. This frequently requires metallographic sample preparation and microscopic examination, which are time consuming and expensive. These disadvantages are oppressive when large numbers of samples must be assessed quickly. Hardness and tensile testing can sometimes be substituted, but sample size and shape frequently make these methods impractical. The test described here is ideal for the evaluation of lamp filaments and other wire samples which can be conveniently coiled. In this test, a standard coiled-coil incandescent lamp filament was used. The coil body was 12.5 mm long, and it was made from standard grade tungsten lamp wire. These samples were heat treated by ohmic resistance in steps of 0.8 seconds duration at temperatures which were expected to span the recrystallization range. Twenty samples were treated so that each was removed from this process at a progressively higher step. The fast was treated only once at the lowest temperature, while the last was treated at all temperatures including the highest. After treatment, the samples were evaluated in the elastic recovery test. Each was carefully stretched using a scale and tweezers to a coil length of 40 mm and then
JOHN W. PUGH, Senior Consulting Metallurgist, is with GE Lighting, General Electric Company, Nela Park, Cleveland, OH 44112. LAURA K. McWHORTER, Studen
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