TY - JOUR
T1 - Effect of Cr on the oxidation resistance of Co-based oxide dispersion strengthened superalloys
AU - Yu, Hao
AU - Ukai, Shigeharu
AU - Hayashi, Shigenari
AU - Oono, Naoko
N1 - Funding Information:
This work is supported by Grant-in-Aid for Scientific Research (B), 24360282, Japan Society for the Promotion of Science (JSPS). The authors would like to thank the laboratory of Nano-Micro Material Analysis in Hokkaido University for the utilizing of EPMA. H. Yu is grateful to the China Scholarship Council (CSC) for the provision of a scholarship.
Publisher Copyright:
©2017 The Japan Institute of Metals and Materials
PY - 2018
Y1 - 2018
N2 - Alumina-forming oxide dispersion strengthened (ODS) superalloys are favorable oxidation-resistant materials for extremely high temperature applications. In order to develop the advanced Co-based superalloys with high strength and superior oxidation resistance at elevated temperature of 1000C, a new series of Co-Cr-Al ODS superalloys were designed and fabricated by mechanical alloying (MA) and spark plasma sintering (SPS), and then followed by hot rolling and annealing at 1200C. In this work, the oxidation behavior of Co-10Al (mass%) ODS superalloys with/without 20Cr was investigated at 1000C in air to understand the effect of Cr on oxidation resistance. The results indicate that the addition of Cr improves the oxidation resistance significantly through optimizing the oxide scales from the multilevel scales with an external CoO/CoAl2O4 and an internal Al2O3 to a single layer of Al2O3. The alumina-forming Co-20Cr-10Al (mass%) ODS superalloys are expected to be applicable at 1000C.
AB - Alumina-forming oxide dispersion strengthened (ODS) superalloys are favorable oxidation-resistant materials for extremely high temperature applications. In order to develop the advanced Co-based superalloys with high strength and superior oxidation resistance at elevated temperature of 1000C, a new series of Co-Cr-Al ODS superalloys were designed and fabricated by mechanical alloying (MA) and spark plasma sintering (SPS), and then followed by hot rolling and annealing at 1200C. In this work, the oxidation behavior of Co-10Al (mass%) ODS superalloys with/without 20Cr was investigated at 1000C in air to understand the effect of Cr on oxidation resistance. The results indicate that the addition of Cr improves the oxidation resistance significantly through optimizing the oxide scales from the multilevel scales with an external CoO/CoAl2O4 and an internal Al2O3 to a single layer of Al2O3. The alumina-forming Co-20Cr-10Al (mass%) ODS superalloys are expected to be applicable at 1000C.
KW - Cobalt-based
KW - Electron probe micro-analyzer
KW - High-temperature oxidation
KW - Oxide dispersion strengthened superalloys
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U2 - 10.2320/matertrans.MJ201603
DO - 10.2320/matertrans.MJ201603
M3 - Article
AN - SCOPUS:85029621633
SN - 1345-9678
VL - 59
SP - 563
EP - 567
JO - Materials Transactions
JF - Materials Transactions
IS - 4
ER -