Study of Columbium-base Alloys PDF Download
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Author: Renpei Yoda
Publisher:
ISBN:
Category : Niobium alloys
Languages : en
Pages : 42
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Book Description
Author: Renpei Yoda
Publisher:
ISBN:
Category : Niobium alloys
Languages : en
Pages : 42
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Book Description
Author: Herbert R. Babitzke
Publisher:
ISBN:
Category : Niobium alloys
Languages : en
Pages : 24
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Author: Renpei Yoda
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
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Book Description
Author: P. A. Kammer
Publisher:
ISBN:
Category : Niobium alloys
Languages : en
Pages : 24
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Book Description
A group of niobium-base alloys is being considered for addition to the Department of Defense Refractory Metals Sheet Rolling Program. Good weldability is one of the requirements. Two alloys under consideration are B- 66, and FS-85. A third alloy, C-129 was also included in this evaluation. Samples of these three alloys were obtained for a brief weldability evaluation to determine whether the alloys met the target properties established by the Materials Advisory Board, Refractory Metals Sheet Rolling Panel-Alloy Requirements and Selection Group. Bend tests made on base-metal samples showed that all alloys met the target properties for base metal. Bend tests of welds made in a vacuum-purged controlled-atmosphere chamber showed that only the welds in the FS-85 alloy possessed the desired target properties.
Author: E. S. Bartlett
Publisher:
ISBN:
Category : Niobium
Languages : en
Pages : 72
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Author: F. F. Schmidt
Publisher:
ISBN:
Category : Niobium
Languages : en
Pages : 274
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Book Description
The results of a state-of-the-art survey covering niobium and 18 of its most promising alloys are presented. All data are given in tabular and graphical form covering some of the more important physical, mechanical, and metallurgical properties for each material. References are given at the conclusion of each material section.
Author: W. J. Lepkowski
Publisher:
ISBN:
Category : Niobium alloys
Languages : en
Pages : 32
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Author: P. S. Rudman
Publisher:
ISBN:
Category :
Languages : en
Pages : 37
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Book Description
This research program attempted to establish whether Fisher's local-order solution-strengthening mechanism is of importance in columbium-base alloys by correlating X-ray diffuse-scattering determinations of local order with mechanical properties. Results of the project indicated that local order can make a significant strengthening contribution, but other mechanisms can also dominate. By X-ray diffuse-scattering powder-pattern analysis, it has been determined that Cb-V alloys are nearly random. The atom-size effect was also determined, indicating there is a size accommodation in solution such that, instead of the 8.5 per cent size difference of the pure components, there is only about a 3 per cent difference. The results are discussed in terms of atom-size-accommodation mechanisms, ordering driving force, and solidsolution strengthening. Solid-solution strengthening due to atom-size difference in a substitutional binary alloy is shown to depend on composition fluctuations. An elastic model of binary solid solutions is extended to include short-range order (SRO) strain relaxation. It is shown that typically about half of the atom dilation and strain energy can be relaxed by SRO.
Author: F. Ostermann
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 70
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Book Description
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.
Author: E. S. Bartlett
Publisher:
ISBN:
Category : Niobium
Languages : en
Pages : 102
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Book Description
Although much information on high-temperature tensile and stress-rupture properties for various columbium-base materials is readily available, only limited information concerning the more useful creep behavior of columbium alloys has been reported. These data are widely scattered throughout the literature, and little attempt has been made to rationalize the creep behavior of columbium alloys. The purpose of this memorandum is to compile and review existing creep data for columbium alloys to gain insight into their merits and limitations for time-dependent structural service. (Author).
