[S6] S6 Materials Science of Additive Manufacturing IX

10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)

[S6.16] Improvement of the Very High Cycle Fatigue Strength by HIP Treatment for Additive Manufactured Maraging Steel

○Yuiko Kita¹, Yoshiyuki Furuya², Koji Takahashi³ (1. Yokohama Natl. Univ. (Graduate Student), 2. NIMS, 3. Yokohama Natl. Univ.)

Keywords:

fatigue strength,additive manufacturing,HIP treatment,maraging steel,very high cycle fatigue

We tested tensile-compressive fatigue of HIP-treated, additive manufactured maraging steel up to 10⁹ cycles. HIP treatment improved fatigue strength throughout the life cycle. Furthermore, defect analysis revealed that HIP treatment minimized internal defects. This shows that reducing defects led to the improvement in fatigue strength.