Application of HIP diffusion bonding technique in the development of nuclear fusion reactor

Masuo, Hiroshige*; Uno, Tsuyoshi*; Takano, Katsutoshi; Hamada, Kazuya; Koizumi, Norikiyo; Nakajima, Hideo

Two pairs of SUS316LNH block samples were prepared, surface treatment was performed on the two bonded surfaces. With the surface treatment, the crystal growth was encouraged by the diffusion of surface treatment material atom as the crystal grain grew across the interface. As shown in result of 77 K charpy impact test, Test piece that gave surface treatment B HIPed under 1,300 C, 118 MPa, and four h holding time provided the largest impact value recorded 120 J/cm at very low temperature. Material yield for the SUS316LNH structure model was calculated taking into account premachining before bonding, and by comparing the machining from bonded structure and from solid material. It was succeeded to reduce the using material mass in half accomplished by component assembly and HIP bonding.