Evaluation of Feasibility of Tungsten/Oxide Dispersion Strengthened Steel Bonding with Vanadium Insert

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  • Noto Hiroyuki
    Graduate School of Energy Science, Kyoto University
  • Kimura Akihiko
    Institute of Advanced energy, Kyoto University
  • Kurishita Hiroaki
    International Research Center for Nuclear Materials Science, Institute for Materials Research (IMR), Tohoku University
  • Matsuo Satoru
    International Research Center for Nuclear Materials Science, Institute for Materials Research (IMR), Tohoku University
  • Nogami Shuhei
    Graduate School of Engineering Department of Quantum Science and Energy Engineering, Tohoku University

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Abstract

A diffusion bonding (DB) technique to reduce thermal expansion coefficient mismatch between tungsten (W) and oxide dispersion strengthened ferritic steel (ODS-FS) was developed by applying a vanadium (V) alloy as an insert material. In order to suppress σ phase precipitation at the interface, DB of ODS-FS and V–4Cr–4Ti was carried out by introducing a Ti insert as a diffusion barrier between V–4Cr–4Ti and ODS-FS, and examined feasibility of W/V/Ti/ODS-FS joint for application to fusion reactor components by comparing the three-point bending strength and microstructure between the joints with and without a Ti diffusion barrier layer. It is shown that the fracture strength of the joint without a Ti insert was decreased by 25% after aging at 700°C for 100 h, but that with a Ti insert shows no change after the aging treatment up to 1000 h. The result indicates that the introduction of a Ti insert leads to the prevention of the formation of σ phase during aging and resultant control of the degradation of the bonding strength.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 54 (4), 451-455, 2013

    The Japan Institute of Metals and Materials

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