[SS] S6 Materials Science of Additive Manufacturing IX

3:20 PM - 3:45 PM JST(6:20 AM - 6:45 AM UTC)

[S6.27] Enhancement of fatigue strength in as-built Ti-6Al-4V fabricated by machine-learning-assisted EB-PBF using PREP powder

○Akihiko Chiba¹, Qisheng Li², Kenta Aoyagi³, Kenta Yamanaka² (1. New Industry Creation Hatchery Center (NICHe), Tohoku University., 2. Institute for Materials Research, Tohoku University., 3. Institute for Materials Research, Tohoku University(Present: Honda R&D))

Keywords:

Ti6Al4V,EB-PBF,PREP powder,Machine learning,Fatigue strength

PREP powder and SVM-assisted EB-PBF suppressed defects in Ti-6Al-4V. The non-HIPed as-built alloy reached run-out at 800 MPa for 10⁷ cycles, owing to an Al-depleted massive-α-like nonequilibrium α/β microstructure that suppressed interfacial voiding.