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 Mn Fe Base and Mn Cr Fe Base Austenitic Alloys written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Manganese-iron base and manganese-chromium-iron base austenitic alloys designed to have resistance to neutron irradiation induced swelling and low activation have the following compositions (in weight percent): 20 to 40 Mn; up to about 15 Cr; about 0.4 to about 3.0 Si; an austenite stabilizing element selected from C and N, alone or in combination with each other, and in an amount effective to substantially stabilize the austenite phase, but less than about 0.7 C, and less than about 0.3 N; up to about 2.5 V; up to about 0.1 P; up to about 0.01 B; up to about 3.0 Al; up to about 0.5 Ni; up to about 2.0 W; up to about 1.0 Ti; up to about 1.0 Ta; and with the remainder of the alloy being essentially iron.
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 An Assessment of Fe Cr Mn Austenitic Alloys for Fusion Service Using Fast Reactor Irradiation written by FA. Garner and published by . This book was released on 1990 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of model Fe-Cr-Mn alloys and various solute-modified high manganese alloys have been irradiated in the Fast Flux Test Facility in order to provide an early assessment of the consequences of substituting manganese for nickel in austenitic stainless steel. The purpose of this substitution is to reduce the level of long term radioactivation of this alloy, a candidate structural material for use in fusion energy devices.
Download or read book Radiation induced Changes in Microstructure written by F. A. Garner and published by ASTM International. This book was released on 1987 with total page 919 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 1994-03 with total page 332 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 Effects of Radiation on Materials written by Roger E. Stoller and published by ASTM International. This book was released on 1992 with total page 1315 pages. Available in PDF, EPUB and Kindle. Book excerpt: Symposium held in Nashville, Tennessee, June 1990. Almost two-thirds of these 91 papers are authored by researchers outside of the US (including information on research in the former USSR, Japan, and Europe). Topics include: current commercial power reactor systems; microstructural characterization
Download or read book The Question of Saturation of Void Swelling in Fe Cr Ni Austenitic Alloys written by FA. Garner and published by . This book was released on 2000 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Whereas in earlier publications it appeared that a possible saturation of neutron-induced void swelling might be developing at temperatures of 400 and 427°C in annealed Fe-Cr-Ni model alloys in a manner that was dependent on composition, data obtained at higher neutron exposures in EBR-II have led to the conclusion that such an expectation was erroneous. At all temperatures in the range 400-650°C, the neutron induced swelling eventually reaches ~1%/dpa and continues to very high swelling levels thereafter without any hint of saturation.
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 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 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 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 Reduced Activation Materials for Fusion Reactors written by R. L. Klueh and published by ASTM International. This book was released on 1990 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Fusion Energy Update written by and published by . This book was released on 1980 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
