High Temperature Niobium Alloys

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High Temperature Niobium Alloys

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Author : Minerals, Metals and Materials Society. Fall Meeting
language : en
Publisher: Minerals, Metals, & Materials Society
Release Date : 1991

High Temperature Niobium Alloys written by Minerals, Metals and Materials Society. Fall Meeting and has been published by Minerals, Metals, & Materials Society this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Heat resistant alloys categories.

Dispersion Strengthening Of High Temperature Niobium Alloys

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Author : D. L. Anton
language : en
Publisher:
Release Date : 1988

Dispersion Strengthening Of High Temperature Niobium Alloys written by D. L. Anton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.

Niobium base alloys are very attractive as high temperature materials for advanced gas turbine applications. After many conventional metallurgical approaches, a high temperature creep resistant alloy has yet to be identified which will replace nickel base superalloys. The best chance for obtaining high temperature creep resistance in these alloys is through dispersion strengthening with a stable precipitate that is introduced through rapid solidification. This would result in a very fine dispersion of nonshearable precipitates that would not coarsen upon long term exposure at temperatures in excess of 1200 C.A study has been conducted here to identify such a stable dispersion, fabricate alloys through solidification approach and characterize the coarsening of the resulting precipitates. A thermodynamic argument is presented to select candidate dispersions for evaluation. Arc melted and splat quenched alloys were fabricated and evaluated through micro-hardness measurements. An indirect assessment of particle stability is introduced which resulted in a coarsening parameter determined for each candidate precipitate at 1400 C. Microscopic examination of the more stable alloys were made via optical and thin foil TEM analyses. Tensile and strain-rate sensitivity tests were run on these alloys at 1400 C. Niobium, Dispersion strengthening, High temperature strength, Particle coarsening, Refractory metals, Niobium alloys. (jes).

High Temperature Niobium Alloys

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Author : Minerals, Metals and Materials Society Staff
language : en
Publisher:
Release Date : 1991-01-01

High Temperature Niobium Alloys written by Minerals, Metals and Materials Society Staff and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991-01-01 with categories.

Fundamental Investigations Of High Temperature Creep Of A Particle Strengthened Niobium Alloy

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Author : David Michael Farkas
language : en
Publisher:
Release Date : 1995

Fundamental Investigations Of High Temperature Creep Of A Particle Strengthened Niobium Alloy written by David Michael Farkas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.

High Temperature Oxidation Of Experimental Niobium Alloys

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Author : Roland Gettliffe
language : en
Publisher:
Release Date : 1989

High Temperature Oxidation Of Experimental Niobium Alloys written by Roland Gettliffe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Niobium alloys categories.

Development Of High Strength Niobium Alloys For Elevated Temperature Applications

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Author : John A. DeMastry
language : en
Publisher:
Release Date : 1960

Development Of High Strength Niobium Alloys For Elevated Temperature Applications written by John A. DeMastry and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1960 with Niobium alloys categories.

Protection Of Refractory Metals For High Temperature Service

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Author : B. F. Brown
language : en
Publisher:
Release Date : 1960

Protection Of Refractory Metals For High Temperature Service written by B. F. Brown and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1960 with categories.

The vapor pressure of each of the niobium-zinc compounds was measured as a function of temperature. The kinetics of formation of the niobiumzinc compounds on pure niobium from zinc vapor were investigated, and oxidation tests were made on several coatings applied with zinc vapor. The mechanisms involved and the kinetics of the removal of interstitial impurities from niobium by the niobium-zinc compounds were also studied. Further studies of the effects of alloying elements added to the zinc bath used to coat niobium by the dip process confirmed that small amounts of nickel and aluminum in the proper combination are beneficial. (Author).

Studies Of Oxidation Of Niobium Alloys At Very High Temperatures

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Author : Per Kofstad
language : en
Publisher:
Release Date : 1967

Studies Of Oxidation Of Niobium Alloys At Very High Temperatures written by Per Kofstad and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with categories.

Oxidation of binary Hf-Nb alloys with 10-50wt%Nb and a few corresponding alloys with ternary additions of Cr, Ti, V, and W has been studied in the temperature range 800-1300 C. Most of the studies were carried out at 10 torr O2, but the oxidation of one binary alloy (Hf-34wt%Nb) was also studied as a function of oxygen pressure. The major reaction products are HfO2, Nb2O5, and Nb2O5 6HfO2. At and above 10 torr O2 the oxidation of the binary alloys increase with temperature up to 900-1000 C, where the oxidation goes through a maximum and then decreases up to about 1100 C. Above 1100 C the oxidation again increases with temperature. This maximum is interpreted as a result of an interplay between relative rates of formation of HfO2 and Nb2O5 and their subsequent reaction to form Nb2O5 6HfO2. The ternary alloy additions of Cr, Ti, and W did not significantly change the oxidation rates. Catastrophic oxidation was observed for Hf-25w/oNb-52/oV and Hf-20w/oNb-10w/oV alloys above 1000 and 900 C, respectively. The binary Hf-Nb alloys showed poor oxidation resistance, and at 900-1000 C the oxidation is as fast as for unalloyed niobium. (Author).

High Temperature Niobium Base Alloys For Sodium Cooled Reactors

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Author : John A. DeMastry
language : en
Publisher:
Release Date : 1961

High Temperature Niobium Base Alloys For Sodium Cooled Reactors written by John A. DeMastry and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Niobium alloys categories.

Metallurgy Of Molybdenum Niobium And Molybdenum Niobium Alloys

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Author : U.S. Atomic Energy Commission
language : en
Publisher:
Release Date : 1963

Metallurgy Of Molybdenum Niobium And Molybdenum Niobium Alloys written by U.S. Atomic Energy Commission and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with Molybdenum categories.