Download or read book Influence of Cold Work and Phosphorus Content on Neutron induced Swelling of Fe Cr Ni Alloys written by and published by . This book was released on 1990 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The overall objective of this effort was to determine the origin of the sensitivity of void swelling and microstructural evolution in irradiated metals to environmental and material variables. A more specific objective was to assist in the interpretation of the results of the 59Ni doping experiment designed to study the separate and synergistic effects of helium and other variables. Two of these variables are cold working and phosphorus content. 14 refs., 7 figs.
Download or read book Microstructural Evolution of Neutron Irradiated Fe Cr Ni Alloys at 495 C in Response to Changes in the Helium DPA Ratio written by FA. Garner and published by . This book was released on 1990 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of three Fe-15Cr-XNi alloys in both annealed and cold worked conditions was irradiated in the fast flux test facility (FFTF) at 495°C to 14 dpa. The experiment was developed to determine the separate and synergistic effects of nickel and phosphorus content, cold work, and helium/dpa ratio. This experiment was conducted without introducing variations in displacement rate, a variable known to strongly influence microstructural evolution. Each alloy condition was irradiated in two variants, one with natural nickel and one enhanced with the 59Ni isotope. The latter variant produces helium/dpa ratios typical of fusion reactor spectra while the former yields a much lower level of helium. The results show that helium alters the microstructural evolution somewhat at 495°C, but its effect is relatively small compared to the influences of the other variables studied. Increases in starting dislocation density, nickel content, or phosphorus level all retard swelling temporarily while higher rates of helium generation usually, but not always, accelerate swelling. Phosphorus addition of 0.04 wt% not only decreased swelling but led to refinement of dislocation loop microstructure and stabilization of dislocation networks created by cold working. Phosphide precipitates did not form at this temperature and dose level.
Download or read book Influence of Cold work on the Neutron induced Swelling of Fe Ni Cr Ternary Alloys written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The swelling of simple Fe-Ni-Cr ternary alloys in EBR-II appears to be sensitive to both irradiation temperature and cold-work. It is suggested that cold-work interacts with the tendency of Fe-Ni-Cr alloys to order during irradiation and thereby affects swelling.
Download or read book Swelling Suppression in Phosphorus Modified Fe Cr Ni Alloys During Neutron Irradiation written by EH. Lee and published by . This book was released on 1990 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phosphorus-containing austenitic alloys in the solution annealed condition were irradiated at 745 to 760 K (470 to 485°C) in the Fast Flux Test Facility (FFTF) reactor to doses ranging from 0.1 to 10 dpa. The alloys were variations on Fe-13Cr-15Ni-0.05P with respective additions of 0.8 silicon, 0.2 titanium, or 0.8 silicon plus 0.2 titanium; also included were low (0.01) and zero phosphorus compositions (all values in wt %). This alloy set was studied previously using heavy ion irradiations.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Complex Action of Major Solutes on Radiation Induced Swelling of Fe Cr Ni Austenitic Alloys written by FA. Garner and published by . This book was released on 1994 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The radiation-induced swelling of simple Fe-Cr-Ni austenitic alloys is known to be very sensitive to solute additions. It is shown in this paper that three of the most common solute elements (P,Si,Mo) exert a very complex and often non-monotonic influence on swelling with increasing solute level. The complexity of this influence and its dependence on other variables appears to be the result of a closely balanced competition between two or more roles played by each solute in its interaction with both vacancies and interstitials. This competition yields a variety of different swelling behaviors in response to changes in solute or solvent composition, displacement rate, and irradiation temperature.
Download or read book INFLUENCE OF CARBON AND DPA RATE ON NEUTRON INDUCED SWELLING OF Fe 15Cr 16Ni 0 25Ti IN FFTF AT 400 DEGREES C written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this effort is to determine the influence of dpa rate and composition on the void swelling of simple austenitic Fe-Cr-Ni alloys. Contrary to the swelling behavior of fcc Fe-15Cr-16Ni and Fe-15Cr-16Ni-0.25Ti alloys irradiated in the same FFTF-MOTA experiment, Fe-15Cr-16Ni-0.25Ti-0.04C does not exhibit a dependence of swelling on dpa rate at approximately 400 degrees C. The transient regime of swelling is prolonged by carbon addition, however.
Download or read book Neutron Induced Swelling of Fe Mn and Fe Cr Mn Austenitic Alloys written by HR. Brager and published by . This book was released on 1987 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: An effort is underway to explore the potential of Fe-Cr-Mn austenitic alloys as substitutes for Fe-Cr-Ni alloys in fusion reactors. This substitution is desired to achieve a reduced level of long-term radioactivity and thereby reduce the cost and safety hazards associated with disposal of reactor components at their end of life. Neutron-induced swelling data to 50 dpa are now available at 520°C for three reduced activation alloy series and for lower exposures at 420 and 600°C. These three series cover simple binary and ternary alloys, solute-modified ternaries, and a variety of commercially available Fe-Cr-Mn alloys. The swelling of these alloys is initially similar to that of Fe-Cr-Ni alloys but then changes in response to phase instabilities that develop in the Fe-Cr-Mn system.
Download or read book Effects of Helium DPA Ratio Alloy Composition and Cold Work on Microstructural Evolution and Hardening of 59Ni Doped Fe Cr Ni Alloys Neutron Irradiated at 465 C written by H. Kawanishi and published by . This book was released on 1996 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three ternary austenitic alloys(Fe-15Cr-25Ni, Fe-15Cr-25Ni-0.04P, Fe-15Cr-45Ni in both annealed and cold worked conditions) were irradiated at 465°C to 0.15, 0.28, and 0.42 dpa at above core position in the Fast Flux Test Facility utilizing the Materials Open Test Assembly to study the separate and synergistic effects of He/dpa ratio, phosphorus addition, nickel content and cold work level on microstructural evolution and hardening. The helium/dpa ratio was varied by isotopic doping with 59Ni to enhance the production rate of helium. The helium production rate was evaluated to be 62 appm He/dpa in the 59Ni-doped specimens and 0.26 appm He/dpa in the undoped specimens.
Download or read book Spinodal like Decomposition and Swelling Induced by Ion Irradiation in Simple Fe Ni and Fe Ni Cr Alloys written by RA. Dodd and published by . This book was released on 1987 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: A previously published correlation between the compositional dependence of neutron-induced swelling at high temperatures in Fe-Ni-Cr alloys and the development of compositional micro-oscillations has also been found in this study of swelling induced by 5-MeV Ni+ ion irradiation. The tendency toward decomposition is strongest in the 35 to 45% nickel range and diminishes in the range of 60 to 75% nickel. Chromium appears to play no role other than as a surrogate for iron. The scale of the micro-oscillation appears to be more sensitive to temperature than displacement rate. One consequence of this decomposition is the occasional formation of precipitate phases upon cooling after irradiation. In Fe-35Ni, cellular martensite is found to form after irradiation at 625, 675, and 725°C. In Fe-60Ni-15Cr irradiated at 625°C an ordered phase that may be Ni3(Fe,Cr) is sometimes formed. The fortuitous formation of these phases allows the visualization of the size and spacing of the compositional modulations.
Download or read book Dependence of Neutron induced Swelling on Nickel and Chromium Content in Fe Ni Cr Ternary Alloys written by F. A. Garner and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975-10 with total page 920 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Complex Action of Major Solutes on Radiation Induced Swelling of Fe Cr Ni Austenitic Alloys written by and published by . This book was released on 1992 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The radiation-induced swelling of simple Fe-Cr-Ni austenitic alloys is sensitive to solute additions. It is shown in this paper that three of the most common solute elements (P, Si, Mo) exert a very complex and often non-monotonic influence on swelling with increasing solute level. The complexity of this influence and its dependence on other variables appears to be the result of a closely balanced competition between two or more roles played by each solute in its interaction with both vacancies and interstitials. This competition yields a variety of different swelling behaviors in response to changes in solute or solvent composition, displacement rate, and irradiation temperature.
Download or read book Metals Abstracts written by and published by . This book was released on 1995 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Phosphorus on the Microstructure of an Fe 16Cr 17Ni Austenitic Ternary Induced by Fast Neutron Irradiations written by H. Watanabe and published by . This book was released on 1994 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of phosphorus on void swelling in austenitic stainless steels under fast neutron irradiation have been investigated. Three model alloys (Fe-16Cr-17Ni, Fe-1BCr-17Ni-0. 024P, Fe-16Cr-17Ni-0. 1P) were irradiated to 40 dpa in the Fast Flux Test Facility (FFTF) using Materials Open Test Assembly (MOTA). The irradiation temperatures were 679K, 793K and 873K. Addition of phosphorus resulted in a suppression in void swelling at all temperatures. At the higher temperatures (793K and 873K), radiation enhanced formation of M2P-type phosphides were observed. These phosphides are expected to act as strong defect sinks, causing suppression of void swelling at these temperatures. On the other hand, at the lower temperature (679K), the suppression of void swelling appeared to be related to the reduction of vacancy mobility by phosphorus addition.
Download or read book Effects of Radiation on Materials written by Arvind S. Kumar and published by ASTM International. This book was released on 1994 with total page 1319 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Swelling Suppression in Phosphorous modified Fe Cr Ni Alloys During Neutron Irradiation written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Phosphorous-containing austenitic alloys in the solution annealed condition were irradiated at 745--760°K. The alloys were variations on Fe--13Cr--15Ni--0.05P with respective additions of 0.8 Si, 0.2 Ti, or 0.8 Si + 0.2 Ti; also included were low (0.01) and zero P compositions (all values in wt. %). The reference ternary and the two phosphorous-only variations contained little precipitation and numerous voids and swelled rapidly, while the three variants containing P with Si and/or Ti showed little or no void formation and profuse phosphide precipitation. Results indicate that phosphorous in solution alone does not have a major influence on void swelling, whereas fine-scale phosphide precipitation is quite effective at eliminating void formation. The principal mechanism restricting swelling is the effect of the dense precipitate microstructure. These precipitates foster profuse cavity nucleation which in turn dilutes the helium atoms (and more time) in order for individual cavities to surpass their critical size and number of gas atoms necessary for subsequent growth as voids. This mechanism for swelling suppression was not found to be particularly sensitive to moderate variations in either the dislocation or cavity densities; the mechanism is strongest at elevated temperature where the critical quantities are large and is less effective at lower temperatures where the critical quantities are small. 19 refs., 10 figs., 3 tabs.
