"Study of oxidation ond degradation of steels in heavy liquid metals"@en . . . "Use of heavy liquid metals (HLM), such as lead-bismuth eutectic and lead, is foreseen for targets and coolants in the newly designed accelerator driven systems (ADS). However, most of the structural materials suffer severe damage when in contact with theHLM. The high dissolution rate of alloying elements such as nickel, chromium as does iron in the liquid metals (LM) is a major limit to steels application. However, introduction of controlled amount of oxygen in the system can improve the materials resistance, due to the growth of protective oxide scales. The mechanism of oxidation for three commercial steels will be investigated and compared to the gaseous oxidation, in order to identify the main causes of failures and the possibility of resistance improvements by dosing the oxygen dissolved in the LM. Microstructure and alloying elements variations will be investigated to ascertain their main role in the oxidation process. In addition to dissolution, the materials undergo mechanical"@en . . "heavy liquid metals; selective dissolution; oxidation; mechanical properties; environmental assisted"@en . . "2007-01-01+01:00"^^ . "10358"^^ . "0"^^ . "2"^^ . "Degradace konstruk\u010Dn\u00EDch ocel\u00ED v t\u011B\u017Ek\u00FDch tekut\u00FDch kovech"@cs . "2"^^ . "0"^^ . . . . . "2192"^^ . . "1"^^ . . . "2009-12-31+01:00"^^ . . "V\u00A0 ADS (Accelerated Driven Systems) syst\u00E9mu je navrhov\u00E1no pou\u017Eit\u00ED t\u011B\u017Ek\u00FDch tekut\u00FDch kov\u016F (eutektikum Pb-Bi a Pb) jako teplosm\u011Bnn\u00E9 m\u00E9dium (ter\u010D a chladivo). Av\u0161ak v\u011Bt\u0161ina konstruk\u010Dn\u00EDch materi\u00E1l\u016F je v\u00E1\u017En\u011B po\u0161kozov\u00E1na kontaktem s\u00A0t\u011B\u017Ek\u00FDmi tekut\u00FDmi kovy. Vysok\u00E1 rychlost rozpou\u0161t\u011Bn\u00ED \u017Eeleza a leguj\u00EDc\u00EDch prvk\u016F v\u00A0tekut\u00E9m kovu (nikl a chrom) je hlavn\u00EDm omezuj\u00EDc\u00EDm faktorem jejich pou\u017Eit\u00ED. Zaveden\u00ED \u0159\u00EDzen\u00ED obsahu kysl\u00EDku v\u00A0syst\u00E9mu m\u016F\u017Ee zlep\u0161it odolnost materi\u00E1l\u016F vzhledem ke vzniku ochrann\u00E9 oxidov\u00E9 vrstvy. Za \u00FA\u010Delem zji\u0161t\u011Bn\u00ED p\u0159\u00ED\u010Din po\u0161kozen\u00ED v\u00A0t\u011B\u017Ek\u00FDch tekut\u00FDch kovech a studia mo\u017Enosti zv\u00FD\u0161en\u00ED odolnosti materi\u00E1l\u016F optimalizac\u00ED d\u00E1vkov\u00E1n\u00ED kysl\u00EDku rozpu\u0161t\u011Bn\u00E9ho v\u00A0tekut\u00E9m kovu bude hodnocen mechanismus oxidace v\u00A0tekut\u00FDch kovech u t\u0159\u00ED vybran\u00FDch komer\u010Dn\u011B pou\u017E\u00EDvan\u00FDch ocel\u00ED a porovn\u00E1n s\u00A0mechanismem oxidace v\u00A0plynn\u00E9m prost\u0159ed\u00ED. Bude zji\u0161\u0165ov\u00E1n vliv mikrostruktury a leguj\u00EDc\u00EDch prvk\u016F na oxida\u010Dn\u00ED proces. Vedle rozpou\u0161t\u011Bn\u00ED jsou konstrukce ADS za provozu nam\u00E1h\u00E1ny deformac\u00ED a teplotn\u00EDmi gradienty. Pomoc\u00ED mechanick\u00FDch zkou\u0161ek"@cs .