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Takaya, Shigeru; Furukawa, Tomohiro; Aoto, Kazumi; Mller, G.*; Weisenburger, A.*; Heinzel, A.*; Inoue, Masaki; Okuda, Takanari*; Abe, Fujio*; Onuki, Somei*; et al.
Journal of Nuclear Materials, 386-388, p.507 - 510, 2009/04
Times Cited Count:57 Percentile:96.28(Materials Science, Multidisciplinary)The corrosion resistance of ODS steels with 03.5 wt% Al and 13.717.3 wt% Cr and of a 12Cr steel were examined. The experiments were conducted at 550 and 650 C up to 3,000 h in stagnant LBE containing 10 and 10wt% oxygen for the ODS steels and at 550 C up to 5,000 h in stagnant LBE containing 10 wt% oxygen for the 12Cr steel, respectively. Protective Al oxide scales were formed on the surfaces of ODS steels with about 3.5 wt% Al and 13.717.3 wt% Cr. The addition of Al is very effective to improve the corrosion resistance of ODS steels. The ODS steel with 16 wt% Cr and no Al does not show any corrosion resistance except for the specimen exposed to LBE with 10 wt% oxygen at 650 C. It is not expected to improve the corrosion resistance by increasing solely Cr content.
Mller, G.*; Schumacher, G.*; Heinzel, A.*; Weisenburger, A.*; Zimmermann, F.*; Furukawa, Tomohiro; Aoto, Kazumi
JNC TY9400 2005-021, 33 Pages, 2005/08
The behaviour of protective oxide layers on P122 and its welds and of ODS steel is examined under conditions of fluctuating temperatures and oxygen concentrations to simulate hot spot and loss of oxygen control. P122 steel (12Cr) and its welded joints are exposed to LBE at 550C for 4000h with oxygen concentrations changing between 10 and 10wt% every 800h. It is found that like in case of constant oxygen concentration of 10wt% a protective spinel layer was maintained on P122 and also on its welded joint. Experiments with fluctuating temperatures from 550C to 650C and back every 800h yield satisfying corrosion protection up to 4800h only for the GESA treated ODS steel in LBE with 10wt%. Original ODS steel in LBE with 10 and 10wt% oxygen showed local strong dissolution attack after 4800h in agreement with the behaviour of ODS in LBE with a constant temperature of 650C. GESA treated ODS steel does not form stable protective alumina layers under condition of fluctuating temperatures in LBE with 10wt% oxygen.
Schroer, C.*; Voss, Z.*; Wedemeyer, O.*; Novotny, J.*; Konys, J.*; Heinzel, A.*; Weisenburger, A.*; Mller, G.*; Furukawa, Tomohiro; Aoto, Kazumi
JNC TY9400 2005-020, 45 Pages, 2005/08
This report summarises the results of exposure experiments on the behaviour of 12Cr-2W steel P122 and an 9Cr-2W ODS-steel in oxygen-containing flowing lead-bismuth eutectic (LBE) at 550C, which were performed in the CORRIDA loop at the Karlsruhe Lead Laboratory (KALLA) as part of the collaboration between the Japan Nuclear Cycle Development Institute and the Karlsruhe Research Centre. The duration of these experiments was nominally 800, 2000, 5000 and 10,000 h. Both steels were tested after surface-finishing by turning and after surface alloying with aluminium in the GESA-facility. Owing to initial problems with the enrichment of oxygen in the flowing LBE, the oxygen content considerably varied during most of these experiments, so that the influence of temporary changes in the oxygen content of the LBE could also be investigated. The behaviour of P122 and ODS at permanently high oxygen content was deduced from an experiment for 4990 h at 550C and (c 510 mass-% or a 10). The results are compared with the findings of exposures to stagnant LBE at 550C and c=10 mass-% (COSTA-experiments).
Schroer, C.*; Voss, Z.*; Wedemeyer, O.*; Novotny, J.*; Konys, J.*; Heinzel, A.*; Weisenburger, A.*; Mller, G.*; Furukawa, Tomohiro; Aoto, Kazumi
JNC TY9400 2005-019, 26 Pages, 2005/08
This report summarises the results of exposure experiments on the behaviour of 12Cr-2W steel P122 joined by multi-run TIG welding in oxygen-containing flowing lead-bismuth eutectic (LBE) at 550C for nominally 800, 2000 and 5000 h. The flow velocity of the LBE and the mean oxygen content were 2 m/s and 510-7 mass-% (aPbO = 10-3), respectively. The influence of surface-alloying with aluminium (GESA-treatment) was also investigated in an exposure experiment for nominally 5000 h. The behaviour of the welded joint is generally comparable to that of P122 (after the standard heat-treatment), both qualitatively and quantitatively. Only few exceptions were observed which probably result from local peculiarities of the specific sample material. After surface alloying with aluminium, no significant oxidation and no liquid metal corrosion occurred in the centre of the specimens (including the weld seam), where the desired high quality of the aluminised layer was achieved.
Koppitz, T.*; Jung, P.*; Mller, G.*; Weisenburger, A.*; Futakawa, Masatoshi; Ikeda, Yujiro
Journal of Nuclear Materials, 343(1-3), p.92 - 100, 2005/08
Times Cited Count:7 Percentile:44.9(Materials Science, Multidisciplinary)Cavitation damage of structural materials due to pressure waves is expected to be one of the majior life-time limiting factors in high power liquid metal spallation targets under pulsed operation. Two methods are developed for the European Spallation Source (ESS) to mitigate this damage: Introduction of gas bubbles to surpress the pressure pulse and surface-hardening of structural materials. Surface-hardening of four 8-13%Cr martenstic steels was examined by thermal treatment with pulsed or scanned electron- and laser-beams as well as by nitriding in plasma. A specimens of the 12%Cr steel were tested in liquid mercury under pulsed proton irradiation, and under mechanical pulsed-loading. Surface damage was analysed by optical, confocal-laser, or scanning-electron microscopy, showing in both tests much better resistance of the hardened material compared to standard condition.
Weisenburger, A.*; Aoto, Kazumi; Mller, G.*; Heinzel, A.*; Furukawa, Tomohiro
Proceedings of 13th International Conference on Nuclear Engineering (ICONE-13) (CD-ROM), 6 Pages, 2005/06
The behaviour of protective oxide layers on P122 and its welds and of ODS steel in LBE is examined under conditions of changing temperatures and oxygen concentrations. P122 teel (Cr) and its welded joints are exposed to LBE at 550 C for 4.000 h with oxygen concentrations of 10 and 10wt% which change every 800 h. It is found that like in case f constant oxygen concentration of 10 wt% a protective spinel layer was maintained on P122 and also on its welded joint. Two experiments are conducted on ODS steel, both with temperatures changing from 550 to 650 C and back every 800 h, one experiment with 10 the other with 10 wt% oxygen in LBE. Like in the former test with constant emperature at 550 C no dissolution attack could be observed in experiments with temperature fluctuation. Contrary to this results is the observed dissolution attack on ODS with a onstant temperature of 650 C at 10 wt% oxygen in which formation of a protective layer was not allowed before reaching 650 C LBE temperature.
Furukawa, Tomohiro; Mller, G.*; Schumacher, G.*; Weisenburger, A.*; Heinzel, A.*; Aoto, Kazumi
Journal of Nuclear Materials, 335(2), p.189 - 193, 2004/11
Times Cited Count:37 Percentile:89.67(Materials Science, Multidisciplinary)In order to investigate the effect of oxygen concentration in LBE on corrosion behavior, exposure test of an oxide dispersion strength martensitic type steel was performed in stagnant lead-bismuth eutectic (LBE) containing 10, 10 and 10wt% of oxygen at 500-650C up to 10,000 hours. Results of metallurgical analysis, it was obtained that the base metal was protected from liquid metal corrosion by the formation of a spinel layer under the test condition containing 10wt% of oxygen at 550C or less. In LBE over 600C containing 10 and 10wt% of oxygen, liquid metal corrosion was observed at some places on the surface. At the condition of 650C containing 10wt% of oxygen, although no oxide layer was observed on the surface, the base metal showed good compatibility with LBE.
Schroer, G.*; Voss, V.*; Wedemeyer, O.*; Novotny, J.*; Konys, J.*; Heinzel, A.*; Weisenburger, A.*; Mller, G.*; Furukawa, Tomohiro; Aoto, Kazumi
JNC TY9400 2004-023, 37 Pages, 2004/05
Furukawa, Tomohiro; Mller, G.*; Schumacher, G.*; Weisenburger, A.*; Heinzel, A.*; 2 of others*
Journal of Nuclear Science and Technology, 41(3), p.265 - 270, 2004/03
Times Cited Count:45 Percentile:92.59(Nuclear Science & Technology)Corrosion tests of the three Japanese materials named 316FR, 12 Cr-steel and ODS-M were performed in stagnant lead bismuth eutectic (LBE) of 500 - 650 degress centigrade for 5,000 h under oxygen control at 10weight percent, and the corrosion prope
Muller, G.*; Schumacher, G.*; Weisenburger, A.*; Heinzel, A.*; Zimmermann, F.*; Furukawa, Tomohiro; Aoto, Kazumi
JNC TY9400 2003-028, 48 Pages, 2004/01
This is the fourth report on the compatibility of structural and fuel cladding materials that has to be investigated for a possible advanced heavy metal cooled reactor system. The first three reports considered the behavior of 316FR, P122 and ODS steels during 800, 2,000, 5,000 and 10,000 h in stagnant LBE between 500 and 650 degrees centigrade containing 10 sup-6 wt% of oxygen. This report describes experiments of 800, 2,000 and 5,000 h duration in liquid Pb-Bi containing 10 sup-4 and 10 sup-8 wt% of oxygen for 316FR, P122 and ODS steels at 550 and 650 degrees centigrade. 1. No significant dissolution attack occurred on 316FR and P122 steels at 550 degrees centigrade with 10 sup-4 wt% oxygen in LBE. They have Protective oxide layers at the surface, like in the experiments with 10 sup-6 wt% oxygen. At the high oxygen concentration (10 sup-4 wt%) thick oxide multilayers develop on 316FR instead of thin spinel layers at 10 sup-6 wt%, in both experiments LBE is enclosed in the oxide layer. With 10 sup-8 at% oxygen in LBE, however, there is no protective scale formation but strong dissolution attack (up to 120 um) occurs at the 316FR specimen.At the P122 only very little dissolution attack (2um) is observed at the surface.
Muller, G.*; Schumacher, G.*; Weisenburger, A.*; Heinzel, A.*; Zimmermann, F.*; Furukawa, Tomohiro; Aoto, Kazumi
JNC TY9400 2003-026, 58 Pages, 2004/01
This is the third report on the compatibility of structural and fuel cladding materials that has to be investigated for a possible advanced heavy metal cooled reactor system. The first two reports considered the behavior of 316 FR, P122 and ODS steels during 800, 2,000 and 5,000 h in stagnant LBE at 500 - 650C containing 10-6 wt% of oxygen. This report describes the results of all experiments including that of 10,000 h duration. Martensitic steels perform well at 500 and 550C up to the maximal exposure time of 10,000 h, while austenites fail after 5,000 h. At temperatures of 600C and 650C all of the steels fail the earlier the higher the temperature is. Steels with Al - alloying at the surface by the GESA process withstand corrosion up to the maximal exposure time at all of the applied temperatures if it is ensured that the Al - concentration at the surface is in between 8 - 15 wt%.
Miura, Akihiko; Kobayashi, Hidekazu; Ayame, Yasuo; Shiotsuki, Masao; Weisenburger, S.*; Roth, G.*
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