Abstract
Three 625type superalloys have been tested in compression over wide ranges of temperatures (900 1150 C) and strain rates (0.001 20 s-l) to investigate the effects of chemical composition on both flow behavior and the resulting microstructure. Initial flow hardening followed by flow softening prevails at all temperatures and strain rates. Dynamic recrystallization has been identified as the main softening mechanism. Constitutive equations are determined from the flow data at a constant strain for the entire range of temperatures and strain rates tested. Asdeformed microstructures, in terms of percentage recrystallization and recrystallized grain size, have been mapped for all three alloys. It has been demonstrated that appropriate selection and control of processing parameters can produce very fine-grain and uniform microstructure required in many applications. Combined information on constitutive equations and asdeformed microstructures will assist the selection of deformation processing parameters to obtain desired microstructures. This work was conducted by the National Center for Excellence in Metalworking Technology, operated by Concurrent Technologies Corporation, under contract to the U.S. Navy as part of the U.S. Navy Manufacturing Technology Program. Superalloys 718,625,706 and Various Derivatives Edited by E.A. Loria The Minerals, Metals & Materials Society, 1994
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