TY - JOUR
T1 - Effect of Neodymium Content on Creep Properties of 9Cr-3Co-3W-Nd-B Steel
AU - Hamaguchi, Tomoaki
AU - Mitsuhara, Masatoshi
AU - Kusuhara, Hideto
N1 - Publisher Copyright:
© 2022 The Iron and Steel Institute of Japan.
PY - 2022
Y1 - 2022
N2 - The effects of the neodymium content on the creep properties and microstructures of 9Cr-3Co-3W-Nd-B steel were investigated. Neodymium had a mild effect on the creep rupture strength at contents up to 0.056 mass%. This suggested that the effects of neodymium compounds and solid-dissolved neodymium were minimal in the microstructures and uniformly creep-deformed parts after normalizing and tempering heat treatment. On the other hand, the reduction of area after creep rupture was improved by the addition of neodymium. Creep rupture occurred at the prior austenite grain boundaries on steel without neodymium. Therefore, neodymium conclusively adhered to the segregated sulfur at the prior austenite grain boundaries to suppress the formation of creep cracks.
AB - The effects of the neodymium content on the creep properties and microstructures of 9Cr-3Co-3W-Nd-B steel were investigated. Neodymium had a mild effect on the creep rupture strength at contents up to 0.056 mass%. This suggested that the effects of neodymium compounds and solid-dissolved neodymium were minimal in the microstructures and uniformly creep-deformed parts after normalizing and tempering heat treatment. On the other hand, the reduction of area after creep rupture was improved by the addition of neodymium. Creep rupture occurred at the prior austenite grain boundaries on steel without neodymium. Therefore, neodymium conclusively adhered to the segregated sulfur at the prior austenite grain boundaries to suppress the formation of creep cracks.
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U2 - 10.2355/isijinternational.ISIJINT-2022-057
DO - 10.2355/isijinternational.ISIJINT-2022-057
M3 - Article
AN - SCOPUS:85136017805
SN - 0915-1559
VL - 62
SP - 1548
EP - 1555
JO - isij international
JF - isij international
IS - 7
ER -