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Titolo:
Production and property evaluation of single crystal austenitic stainless steels
Autore:
Okamoto, K; Yoshinari, A; Kaneda, J; Aono, Y; Kato, T;
Indirizzi:
Hitachi Ltd, Hitachi Res Lab, Hitachi, Ibaraki 3191292, Japan Hitachi LtdHitachi Ibaraki Japan 3191292 Hitachi, Ibaraki 3191292, Japan Hitachi Ltd, Nucl Syst Div, Hitachi, Ibaraki 3178511, Japan Hitachi Ltd Hitachi Ibaraki Japan 3178511 Hitachi, Ibaraki 3178511, Japan
Titolo Testata:
MATERIALS TRANSACTIONS JIM
fascicolo: 7, volume: 41, anno: 2000,
pagine: 806 - 814
SICI:
0916-1821(200007)41:7<806:PAPEOS>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
GRAIN-BOUNDARY SEGREGATION; STRESS-CORROSION CRACKING; PHOSPHORUS SEGREGATION; ELECTRON-IRRADIATION; SOLUTE SEGREGATION; ALLOYS; ELEMENTS; WATER;
Keywords:
austenitic stainless steel; single crystal growth; unidirectional solidification; equivalent ratio (Cr-eq/Ni-eq); irradiation-assisted stress corrosion cracking (IASCC); stress corrosion cracking (SCC); creviced bent beam (CBB) rest; tensile property;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Okamoto, K Hitachi Ltd, Hitachi Res Lab, 4026 Kuji Cho, Hitachi, Ibaraki 3191292, Japan Hitachi Ltd 4026 Kuji Cho Hitachi Ibaraki Japan 3191292 , Japan
Citazione:
K. Okamoto et al., "Production and property evaluation of single crystal austenitic stainless steels", MATER T JIM, 41(7), 2000, pp. 806-814

Abstract

Austenitic stainless steels are currently known to have irradiation-assisted stress corrosion cracking (IASCC) susceptibility when exposed to critical neutron irradiation in pure water environment at high temperatures. Sincethe radiation induced segregation (RIS) at grain boundaries (GBs) has beenconsidered as a predominant factor for IASCC, the use of single crystals may be an effective way to prevent RIS. In this paper, relations between thesingle crystal growth and chemical compositions were studied. The single crystal austenitic stainless steels were manufactured by a mold withdrawal unidirectional solidification method which can provide large size single crystals. The single crystal growth was observed to depend on equivalent ratio(Cr-eq/Ni-eq). The single crystals with equivalent ratio (Cr-eq/Ni-eq) below 1.83 were manufactured. Steels with equivalent ratio (Creq/Nieq) over 1.87 were not suitable for manufacturing single crystals. The interdendritic delta phases were observed in the as-cast state of the single crystals. Furthermore, several properties of single crystals were evaluated. The resistance against SCC were examined by the creviced bent beam test (CBB test) in pure water at high temperature. No crack was observed in the CBB test specimens of the single crystal, even at the gamma/delta boundaries, whereas polycrystals were slightly cracked. However, 0.2% proof stresses of these single crystals were lower than those of polycrystalline austenitic stainless steels because grain boundary strength can not be expected in a single crystal.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 04:32:24