[SS] S6 Materials Science of Additive Manufacturing IX

4:50 PM - 5:05 PM JST(7:50 AM - 8:05 AM UTC)

[S6.30] Localized α’ Martensite Refinement in Ti6246 during Multi Track Laser Surface Melting of Ti Based Alloys

○Yebeen Ji¹, Prince Valentine Cobbinah², Chincheng Tsai¹, Takayuki Shiraiwa¹, Yoshiaki Toda³, Ryosuke Ozasa⁴, Takuya Ishimoto^4,5, Takayoshi Nakano⁴, Yoko Yamabe-Mitarai¹ (1. UTokyo, 2. UTokyo (Present: Micron Inc.), 3. NIMS, 4. Osaka Univ., 5. Univ. of Toyama)

Keywords:

Additive manufacturing,Titanium alloys,Martensite refinement,Ti6246

Laser surface melting was conducted on four Ti-based alloys to clarify the origin of unusual α′ martensite refinement in Ti6246. Localized ultrafine α′ formed only in Ti6246 under high-energy multi-track conditions, suggesting an alloy-specific response to repeated thermal history.