耐熱超合金の積層造形技術の開発

積層造形(Additive Manufacturing)は3Dデータから直接に部品が得られるという新たなモノづくり技術として、航空宇宙分野や医療分野での新たな部品製造技術として採用され始めています。しかし、数多くある構造材料の中で積層造形の実績がある材料はまだ限られています。特に極限耐熱性を要求される耐熱超合金では造形時のひずみや割れ発生の課題があり、特性が既存の鍛造材や鋳造材よりも劣るという課題があります。

私の研究ではこの積層造形をより耐熱性の高い合金に適用できるようにするtための割れや特性低下を防ぐためのプロセス開発、さらには積層造形に適用することでより高い特性を実現できる新材料開発を対象にしています。

Advancing Additive Manufacturing of Heat‑Resistant Superalloys

Additive Manufacturing (AM) is emerging as a new fabrication technology that enables the direct production of components from 3D data, and it is increasingly being adopted in fields such as aerospace and medical engineering. However, among the many structural materials used today, only a limited number have been successfully applied to AM. In particular, for heat‑resistant superalloys that must withstand extreme high‑temperature environments, challenges such as deformation and cracking during fabrication remain, and AM‑processed materials often exhibit inferior properties compared with conventional wrought or cast alloys.

My research focuses on expanding the applicability of AM to higher‑temperature alloys by developing fabrication processes that suppress cracking and property degradation. In addition, I aim to design new alloy systems that can achieve even higher performance when produced through AM.

耐熱超合金(IN738LC)の積層造形体(レーザ粉末床積層造形体)に生じる割れが熱処理条件に対してどのように変化するかを調べています。最終的には造形条件・熱処理条件を適切に選定する事で割れ欠陥を抑止することに成功しました。

We investigated how cracking in additively manufactured IN738LC superalloy components (produced by laser powder bed fusion) changes under different heat‑treatment conditions. Through this work, we succeeded in suppressing cracking by optimizing both the fabrication parameters and the post‑build heat‑treatment conditions.