[1L10-14] Fusion Reactor Materials 1

3:45 PM - 4:00 PM JST(6:45 AM - 7:00 AM UTC)

[1L14] Hardening Behavior and Ti-rich phase in Explosively Welded V-4Cr-4Ti/SUS316L Joint after Heat Treatment

*Junzuo Lai¹, Hideo WATANABE², Kazutoshi TOKUNAGA¹, Kazuyuki HOKAMOTO³, Shigeru TANAKA³, Takuya NAGASAKA⁴ (1. Kyushu Univ., 2. Tohoku Univ., 3. Kumamoto Univ., 4. NIFS)

Keywords:

Explosive welding,V-4Cr-4Ti,Heat treatment,Hardness,Ti-rich phase

To investigate the influence of high-temperature exposure on explosively welded V-4Cr-4Ti and SUS316L, post-weld heat treatments (PWHT) were conducted at 500–900℃. Hardness tests revealed the highest hardness of 1290HV in the vortex region at 700℃, while a 1050HV interlayer was formed at 900℃. STEM analyses showed Ti-rich phase at the interface were formed, indicating that the hardening may be due to their formation.