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M
ller, G.*; Schumacher, G.*; Heinzel, A.*; Weisenburger, A.*; Zimmermann, F.*; Furukawa, Tomohiro; Aoto, Kazumi
JNC TY9400 2005-021, 33 Pages, 2005/08
JNC-TY9400-2005-021.pdf:2.69MB
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 550
C for 4000h with oxygen concentrations changing between 10
and 10
wt% 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.
C for 10,000hSchroer, 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
JNC-TY9400-2005-020.pdf:5.26MB
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
5
10
mass-% or a
10
). The results are compared with the findings of exposures to stagnant LBE at 550C and c=10 mass-% (COSTA-experiments).
C for 5,000hSchroer, 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
JNC-TY9400-2005-019.pdf:5.04MB
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.