Author : F. Ostermann
Release : 1966
Genre : Alloys
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Investigation of Precipitates in Two Carbon-containing Columbium-base Alloys - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Investigation of Precipitates in Two Carbon-containing Columbium-base Alloys write by F. Ostermann. This book was released on 1966. Investigation of Precipitates in Two Carbon-containing Columbium-base Alloys available in PDF, EPUB and Kindle. The 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.