TY - JOUR
T1 - Interfacial microstructures and hardness distributions of vacuum plasma spraying W-coated ODS ferritic steels for fusion plasma facing applications
AU - Noh, Sanghoon
AU - Kasada, Ryuta
AU - Kimura, Akihiko
AU - Nagasaka, Takuya
AU - Sokolov, Mikhail A.
AU - Kim, Tae Kyu
N1 - Funding Information:
This work was supported by Japan/U.S. joint research project, TITAN (Tritium, Irradiation and Thermofluid for America and Nippon) . This work was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government(MEST) (No. 2012M2A8A1027872 ).
PY - 2014/4
Y1 - 2014/4
N2 - In the present study, interfacial microstructures and hardness distributions of W-coated ODS steels as plasma facing structural materials were investigated. A vacuum plasma spraying (VPS) technique was employed to fabricate a W layer on the surface of the ODS ferritic steel substrates. The microstructural observations revealed that the VPS-W has very fine grains aligned toward the spraying direction, and a favorable interface between W and ODS ferritic steels by a mechanical inter-locking without an intermetallic layer. However, crack-type defects were found in VPS-W. Because a brittle inter-diffused layer does not exist at the joint interface, the hardness was gradually distributed in the joint region. After neutron irradiation, irradiation hardening significantly occurred in the VPS-W. However, the hardening of VPS-W was less than that of bulk W irradiated at 773 K. Thus, the VPS is considered to be one of the promising ways to join dissimilar materials between W and ODS steels, which can avoid the formation of an interfacial intermetallic layer and create favorable irradiation hardening resistance on the W coated layer.
AB - In the present study, interfacial microstructures and hardness distributions of W-coated ODS steels as plasma facing structural materials were investigated. A vacuum plasma spraying (VPS) technique was employed to fabricate a W layer on the surface of the ODS ferritic steel substrates. The microstructural observations revealed that the VPS-W has very fine grains aligned toward the spraying direction, and a favorable interface between W and ODS ferritic steels by a mechanical inter-locking without an intermetallic layer. However, crack-type defects were found in VPS-W. Because a brittle inter-diffused layer does not exist at the joint interface, the hardness was gradually distributed in the joint region. After neutron irradiation, irradiation hardening significantly occurred in the VPS-W. However, the hardening of VPS-W was less than that of bulk W irradiated at 773 K. Thus, the VPS is considered to be one of the promising ways to join dissimilar materials between W and ODS steels, which can avoid the formation of an interfacial intermetallic layer and create favorable irradiation hardening resistance on the W coated layer.
KW - Oxide dispersion strengthened steels
KW - Tungsten
KW - Vacuum plasma spraying
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U2 - 10.1016/j.fusengdes.2014.01.084
DO - 10.1016/j.fusengdes.2014.01.084
M3 - Article
AN - SCOPUS:84901635415
VL - 89
SP - 289
EP - 293
JO - Fusion Engineering and Design
JF - Fusion Engineering and Design
SN - 0920-3796
IS - 4
ER -