TY - JOUR
T1 - Effect of nb on thermal-shock resistance of austenitic heat resistant cast steel+1
AU - Okuyama, Tetsuya
AU - Higashizono, Takumi
AU - Luan, Ngo Huynh Kinh
AU - Kudo, Masaki
N1 - Publisher Copyright:
© 2020 The Japan Institute of Metals and Materials.
PY - 2020/9/1
Y1 - 2020/9/1
N2 - The effect of Nb on microstructure and thermal-shock resistance was investigated for as cast and annealed JIS SCH21 steels. Primary NbC carbide were crystallized together with M23C6 at grain boundary in as cast steel. Decomposition of primary M23C6 was detected, while NbC was also hardly decomposed when annealed at elevated temperature. It was found that chromium carbides had low thermal stability but primary NbC carbides played a role in preventing propagation of micro-cracks and restraining shape deformation under condition both heating and quenching. As a result, thermal-shock resistance was improved in the Nb-added steel.
AB - The effect of Nb on microstructure and thermal-shock resistance was investigated for as cast and annealed JIS SCH21 steels. Primary NbC carbide were crystallized together with M23C6 at grain boundary in as cast steel. Decomposition of primary M23C6 was detected, while NbC was also hardly decomposed when annealed at elevated temperature. It was found that chromium carbides had low thermal stability but primary NbC carbides played a role in preventing propagation of micro-cracks and restraining shape deformation under condition both heating and quenching. As a result, thermal-shock resistance was improved in the Nb-added steel.
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U2 - 10.2320/matertrans.MT-M2020121
DO - 10.2320/matertrans.MT-M2020121
M3 - Article
AN - SCOPUS:85091288837
SN - 1345-9678
VL - 61
SP - 1711
EP - 1716
JO - Materials Transactions
JF - Materials Transactions
IS - 9
ER -