Download or read book Neutron induced Swelling of Fe Cr Mn Ternary Alloys LMFBR written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: It appears that the swelling of Fe-Cr-Mn alloys is remarkably insensitive to both irradiation temperature (420 to 600°C) and composition. The slight dependence of macroscopic swelling on manganese content is thought to be primarily the consequence of a composition-dependent densification, possibly associated with radiation-induced spinodal decomposition in the Fe-Cr-Mn Invar regime. The steady-state swelling rate of these alloys appears to be approx. 1%/dpa.
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 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 Swelling of Austenitic Iron Nickel Chromium Ternary Alloys During Fast Neutron Irradiation written by HR. Brager and published by . This book was released on 1985 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Swelling data are now available for 15 iron-nickel-chromium ternary alloys irradiated to exposures as high as 110 displacements per atom (dpa) in Experimental Breeder Reactor-II (EBR-II) between 400 and 650°C. These data confirm trends observed at lower exposure levels and extend the generality of earlier conclusions to cover a broader range of composition and temperature. It appears that all austenitic iron-nickel-chromium ternary alloys eventually approach an intrinsic swelling rate of ~1%/dpa over a range of temperature even wider than studied in this experiment. The duration of the transient regime that precedes the attainment of this rate is quite sensitive to nickel and chromium content, however.
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 NEUTRON INDUCED SWELLING OF Fe Cr BINARY ALLOYS 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, He/dpa ratio and composition on the void swelling of simple binary Fe-Cr alloys. Contrary to the behavior of swelling of model fcc Fe-Cr-Ni alloys irradiated in the same FFTF-MOTA experiment, model bcc Fe-Cr alloys do not exhibit a dependence of swelling on dpa rate at approximately 400 degrees C. This is surprising in that an apparent flux-sensitivity was observed in an earlier comparative irradiation of Fe-Cr binaries conducted in EBR-II and FFTF. The difference in behavior is ascribed to the higher helium generation rates of Fe-Cr alloys in EBR-II compared to that of FFTF, and also the fact that lower dpa rates in FFTF are accompanied by progressively lower helium generation rates.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1984 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 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 1985 with total page 1652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Nickel on Microstructural Development and Microchemical Changes in Neutron Irradiated Fe Cr Mn Based Steels written by H. Takahashi and published by . This book was released on 1992 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microstructural changes and solute segregation in austenitic Fe-Cr-Mn-Ni alloys have been studied after neutron irradiation to 25 dpa (maximum) in FFTF/MOTA. Voids were nucleated in all of the specimens in the temperature range of 420 to 650°C, and a swelling peak was observed to form at 550°C. The void suppression effect of nickel additions did not occur in these alloys. Precipitates were formed in the matrix and/or on grain boundaries and were mostly identified as M23C6. The composition in the grain boundary area changed, and the chromium (Cr) concentration near the precipitates became higher. On the other hand, manganese and chromium were depleted, and nickel was enriched in the grain boundary area, but without precipitation. Other phases such as ferrite and sigma could not be recognized. Thus, it was revealed that the addition of nickel to Fe-Cr-Mn alloy stabilizes the austenite even in the grain boundary area where segregation is marked.
Download or read book Microstructural Evolution of Neutron irradiated Fe Cr Ni Ternary Alloys at High Helium Generation Rates written by and published by . This book was released on 1993 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of Fe-Cr-Ni ternary alloy, were irradiated to 12-14 dpa in the Oak Ridge Research Reactor (ORR). In this experiment, most of helium atoms were produced by the 58Ni(n, [gamma])59Ni(n, [alpha])56Fe sequential reaction, and, therefore, the helium generation rate was almost proportional to the nickel content, ranging from 27 to 58 appm He/dpa in 20 to 45 wt.% Ni alloys. Irradiation temperatures were 330, 400, 500 and 600°C, and the specimen variables were the nickel level, the chromium level and cold working. The high levels helium, combined with details of the temperature history, were found to have dominated microstructural development, sometimes overwhelming and even reversing the action of a given material variable. Microscopy examination showed that there was an unprecedented refinement of cavity microstructure at all temperatures, which accounts for the substantial alterations in both swelling and mechanical properties observed in earlier studies.
Download or read book Neutron Induced Microstructural Evolution of Fe 15Cr 16Ni Alloys at 400 C During Neutron Irradiation in the FFTF Fast Reactor written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An experiment conducted at ~400 degrees C on simple model austenitic alloys (Fe-15Cr-16Ni and Fe-15Cr-16Ni-0.25Ti, both with and without 500 appm boron) irradiated in the FFTF fast reactor at seven different dpa rates clearly shows that lowering of the atomic displacement rate leads to a pronounced reduction in the transient regime of void swelling. While the steady state swelling rate (~1%/dpa) of these alloys is unaffected by changes in the dpa rate, the transient regime of swelling can vary from
Download or read book Microstructural Examination of Fe Cr Mn Alloys After Charged Particle Irradiation written by Y. Kohno and published by . This book was released on 1992 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The microstructures of a simple ternary Fe-16Cr-15Mn alloy and a solute modified Fe-12Cr-18Mn-0.26C WVN alloy were examined after irradiation with 4-MeV Ni ions (single-beam irradiation) and with 4-MeV Ni ions with simultaneous injection of energy-degraded 1-MeV He ions (dual-beam irradiation). The microstructure prior to irradiation revealed that the ferrite phase was dominant in the Fe-16Cr-15Mn alloy in spite of the prediction of the Schaef-fler diagram, while the Fe-12Cr-18Mn-0.26C WVN alloy contained only austenite. In the irradiated Fe-16Cr-15Mn alloy, formation of a lenticular-shaped phase was observed following irradiation to 15 dpa or more. Electron diffraction analysis demonstrated that this was an austenite phase. Austenite formation was observed in both dual-beam and single-beam irradiations. The fraction of this phase increased abruptly in the early stages of irradiation. The volume fraction saturated to about 70% following irradiation beyond 20 dpa, but the saturation appeared to occur faster in dual-beam irradiations than in single-beam irradiations. Cavities were formed uniformly only within the austenite phase. Local swelling reached as high as 50% following irradiation at 773 K to 120 dpa. In the Fe-12Cr-18Mn-0.26C WVN alloy, the austenite structure was stable during irradiation, and no radiation-induced phase transformation was observed. Cavity formation was strongly suppressed in this alloy. Small cavities with a number density less than 1022 m-3 were observed following irradiation at 773 K to 35 dpa. The calculated swelling from these cavities was estimated as high as 0.4%, which was much lower than the swelling level in dual-beam irradiated 316 stainless steel.
Download or read book Swelling of Solute modified Fe Cr Mn Alloys in FFTF Fast Flux Test Facility MOTA written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Density change data continue to be accumulated on solute-modified and commercial Fe-Cr-Mn alloys irradiated at 520°C and 50 dpa. The tendency toward saturation of density change observed in the simple ternary alloys in the annealed condition is accentuated by cold-working and solute addition. Irradiation at 420°C appears to further accelerate the tendency toward saturation.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt:
