Interfacial microstructures and hardness distributions of vacuum plasma spraying W-coated ODS ferritic steels for fusion plasma facing applications

Sanghoon Noh, Ryuta Kasada, Akihiko Kimura, Takuya Nagasaka, Mikhail A. Sokolov, Tae Kyu Kim

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)289-293
Number of pages5
JournalFusion Engineering and Design
Volume89
Issue number4
DOIs
Publication statusPublished - 2014 Apr
Externally publishedYes

Keywords

  • Oxide dispersion strengthened steels
  • Tungsten
  • Vacuum plasma spraying

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

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