Aging Phenomena in Columbium-base Alloys
Author: D. O. Hobson
Publisher:
Published: 1962
Total Pages: 30
ISBN-13:
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Author: D. O. Hobson
Publisher:
Published: 1962
Total Pages: 30
ISBN-13:
DOWNLOAD EBOOKAuthor: F. Ostermann
Publisher:
Published: 1966
Total Pages: 70
ISBN-13:
DOWNLOAD EBOOKThe precipitates in the commercial columbium alloys D-31 and D-43 were investigated after various heat treatments. The titanium-rich and zirconium-rich monocarbides are the only stable precipitate phases in alloys D-31 and D-43, respectively. The temperatures for complete solid solution are 1600C for alloy D-31 and 1700C for alloy D-43 corresponding to a carbon content of about 0.09 wt.-%. Non-equilibrium columbium carbides precipitate even during quenching from solid solution, so that no appreciable carbon supersaturation can be achieved in columbium alloys. During aging, the stable monocarbides form at the expense of the non-equilibrium columbium carbides but not from solid solution. Therefore, age-hardening caused by stable MC-phase precipitation does not occur. The effect of oxygen on carbide precipitates was investigated by increasing the oxygen concentration of the alloys on purpose. Oxygen behaved differently in both alloys with respect to precipitate phases. A columbium carbide phase with unknown lattice structure but a composition corresponding approximately to Cb3C2 was found in both alloys after suitable heat treatments.
Author: David O. Hobson
Publisher:
Published: 1961
Total Pages: 34
ISBN-13:
DOWNLOAD EBOOKAuthor: Oak Ridge National Laboratory
Publisher:
Published: 1964
Total Pages: 302
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Publisher:
Published: 1965
Total Pages: 26
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DOWNLOAD EBOOKAuthor: I. Machlin
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 493
ISBN-13: 1468491202
DOWNLOAD EBOOKThis publication documents Proceedings of the Symposium on Metal lurgy and Technology of Refractory Metal Alloys, held in Washington, D.C. at the Washington Hilton Hotel on April 25-26, 1968, under sponsorship of the Refractory Metals Committee, Institute of Metals Division, of the Metallurgical Society of AIME, and the National Aeronautics and Space Administration. The Symposium presented critical reviews of selected topics in refractory metal alloys, thereby contributing to an in-depth understanding of the state-of-the-art, and establishing a base line for further research, development, and application. This Symposium is fifth in a series of conferences on refractory metals, sponsored by the Metallurgical Society of AlME. Publications issuing from the conferences are valuable technical and historical source books, tracing the evolution of refractory metals from early laboratory alloying studies to their present status as useful engineering materials. Refractory metals are arbitrarily defined by melting point. A 0 melting temperature of over 3500 F was selected as the minimum for this Symposium, thus excluding chromium and vanadium, which logically could be treated with other refractory metals in Groups VA and VIA of the periodic table. The Refractory Metals Committee is planning reviews of chromium and vanadium in subsequent conferences.
Author: J. O. Betterton
Publisher:
Published: 1962
Total Pages: 46
ISBN-13:
DOWNLOAD EBOOKAuthor: Albert M. Hall
Publisher:
Published: 1972
Total Pages: 120
ISBN-13:
DOWNLOAD EBOOK"The Columbus Laboratories, Battelle Memorial Institute, originally prepared these reports in 1965 and later revised them, updating the information to include the latest technology through 1968. This report is one of a series pertaining to the fabricating of nickel, nickel-base, and cobalt-base alloys. This report deals with heat treating and working nickel and nickel-base alloys, and with the effects of these operations on the mechanical properties of the materials. The subjects covered are annealing, solution treating, stress relieving, stress equalizing, age hardening, hot working, cold working, combinations of working and heat treating (often referred to as thermomechanical treating), and properties of the materials at various temperatures. The equipment and procedures used in working the materials are discussed, along with the common problems that may be encountered and the precautions and corrective measures that are available."--Foreword.
Author:
Publisher:
Published: 1961
Total Pages: 438
ISBN-13:
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