Download or read book Dispersion Hardening in Niobium Base Alloys written by E. M. Savitskii and published by . This book was released on 1969 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: By methods of microstructural, electrochemical and X-ray analyses it was shown that base niobium alloys (system Nb-W-Mo-Zr-C), containing zirconium in their composition age at temperatures 900-1100 degrees C with the formation of oxide, nitride and carbide phases. The deformed and annealed states were studied for prolonged use at high temperatures in relation to coagulation and the embrittling effect of oxide and nitride phases.

Download or read book Dispersion Strengthening of High Temperature Niobium Alloys written by D. L. Anton and published by . This book was released on 1988 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Download or read book Physical and Mechanical Properties of Columbium and Columbium base Alloys written by E. S. Bartlett and published by . This book was released on 1960 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Survey of Dispersion Strengthening of Metals and Alloys summary Technical Report written by Rointan Framroze Bunshah and published by . This book was released on 1959 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Strengthening Mechanisms Creep and Fatigue Processes in Dispersion Hardened Niobium Alloy written by and published by . This book was released on 1992 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: The creep and fatigue properties of pure Nb and Nb-l%Zr alloy were investigated. A model was developed based on the migration of subgrain boundary that can explain the anomalous primary creep transients found in Nb-l%Zr alloy, due to coarsening of subgrain structure. TEM investigations confirmed that such subgrain coarsening occurs during primary creep of Nb-l%Zr. Baseline low cycle fatigue studies of Nb and Nb-l%Zr were completed. Cyclic hardening is observed and there is a microplastic plateau in Nb. The Nb-1%Zr is stronger in cyclic deformation than Nb, with little influence of strain rate. The deformation in the alloy at both high and low strain rates is controlled by the interaction between gliding edge dislocation and solute atoms. Creep, fatigue, niobium alloy, dislocation mechanisms.

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976-06 with total page 1216 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydrogen Strengthening in Niobium and Niobium base Alloys written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper discusses solid-solution hardening, precipitate hardening, and alloy softening for Nb and Nb-base interstitial alloys. The effects of these strengthening mechanisms on strain rate sensitivity and ductility are also examined. It is shown that all three strengthening effects involve mainly interaction of dislocations with mobile hydrogen defects and are influenced or caused by residual interstitial solutes. (DLC).

Download or read book Hardness Behavior of Binary and Ternary Niobium Alloys at 77 and 300 K written by Joseph R. Stephens and published by . This book was released on 1974 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Government Research Reports written by and published by . This book was released on 1964 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1989 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements written by and published by . This book was released on 1975-06-27 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book INIS Atomindex written by and published by . This book was released on 1982 with total page 1150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and published by . This book was released on 1964 with total page 1148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 714 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ageing in Niobium rich Niobium hafnium carbon Alloys written by D. C. Briggs and published by Queen's Printer. This book was released on 1966 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Niobium Tantalum Molybdenum and Tungsten written by University of Sheffield. Department of Metallurgy and published by . This book was released on 1961 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: