Effect of composite interlayer on bonding quality of W and steel HIP joint

• Published in: Fusion engineering and design Vol. 149; p. 111337
• Main Authors: Wang, Ji-Chao, Huang, Jianjun, Sun, Huibin, Wang, Wanjing, Li, Qiang, Xu, Shiwei, Qin, Sigui, Liu, Songlin, Luo, Guang-Nan, Li, Jiangang
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.12.2019; Elsevier Science Ltd
• Subjects: Bonded joints; Bonding strength; Breeder reactors; Composite interlayers; Copper; Cu/Ni; Ferritic stainless steels; Heat treating; Heat treatment; Hot isostatic pressing; Interlayers; Intermetallic compounds; Martensitic stainless steels; Nickel base alloys; Nickel compounds; Residual stress; Shear strength; Steel; Titanium compounds; FW; Steel; Composite interlayers; Cu/Ni; W
• ISSN: 0920-3796; 1873-7196
• DOI: 10.1016/j.fusengdes.2019.111337

Tungsten (W) and Ferritic/Martensitic Steel (FMS) bonding is one of the key technologies to fabricate breeder blankets for fusion reactor. For bonding W and FMS, interlayers help to release residual stress and prevent intermetallic compound (IMC) formation. In this work, Ni/Ti/Ni, Ti/Ni, Cu/Ni and Cu were tested for joining W/FMS using Hot Isostatic Pressing (HIP) at 900 °C for 1 and 2 h with an applied pressure of 150 MPa. Compared to W/Ti/FMS joints, Ni prevents the formation of Ti-Fe brittle phase, however, TiNi, Ti2Ni, TiNi3 and Ni4W phases weaken the bonding strength. On the other hand, W/Cu/Ni/FMS interfaces are free from IMC and joints survive the Post Welding Heat Treatment (PWHT) at 1050 ℃ and 760 ℃. The highest shear strength of W/Cu/Ni/FMS reaches 185 MPa and the samples fracture plastically.