【公開日：2025.06.10】【最終更新日：2025.05.07】

課題データ / Project Data

課題番号 / Project Issue Number

24TU0106

利用課題名 / Title

レーザ粉末床溶融結合法による SUS316L の微細組織解析

利用した実施機関 / Support Institute

東北大学 / Tohoku Univ.

機関外・機関内の利用 / External or Internal Use

外部利用/External Use

技術領域 / Technology Area

【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-

【重要技術領域 / Important Technology Area】（主 / Main）マルチマテリアル化技術・次世代高分子マテリアル/Multi-material technologies / Next-generation high-molecular materials（副 / Sub）-

キーワード / Keywords

電子顕微鏡/ Electronic microscope,3D積層技術/ 3D lamination technology,集束イオンビーム/ Focused ion beam

利用者と利用形態 / User and Support Type

利用者名（課題申請者）/ User Name (Project Applicant)

孫 飛

所属名 / Affiliation

名古屋大学大学院工学研究科

共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes

ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes

早坂祐一郎,兒玉裕美子

利用形態 / Support Type

（主 / Main）技術代行/Technology Substitution（副 / Sub）-

利用した主な設備 / Equipment Used in This Project

TU-502：超高分解能分析電子顕微鏡
TU-508：集束イオンビーム加工装置

報告書データ / Report

概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)

Laser powder bed fusion (LPBF) generates large thermal gradients and rapid cooling rates, making it challenging to fully understand the relationship between nano-scaled solidification microstructure and process parameters. Most studies have focused on characterizing microstructures from macro to sub-micrometer scales, with few investigating features at the nano or atomic levels. Therefore, this study aims to explore these nano/atomic scale microstructural features of 316L stainless steel (SS) produced through LPBF to better understand the relationship between solidification microstructure and process parameters. 316L stainless steel was manufactured by the LPBF method.

実験 / Experimental

A basic set of process parameters was selected for manufacturing the studied specimens. All the microstructural analyses were performed in the as-built samples. TEM specimens were prepared by FIB.  Microstructural features were observed using transmission electron microscopy (Titan3 60-300 Double Corrector STEM).

結果と考察 / Results and Discussion

The bright contrast in the HAADF-STEM image of the dislocation cell structure indicates strong elemental segregation at the dislocation cell boundaries. The corresponding EDS maps confirm the Cr, Mo and Ni segregation and Fe depletion at the cell boundaries. Focused on the atomic scale HAADF-STEM image, the EDS mapping results show that Fe, Ni, Cr, and C are almost distributed homogeneously, but Mo displays an inhomogeneous feature.

図・表・数式 / Figures, Tables and Equations

Nano and atomic scale EDS mapping results

その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)

成果発表・成果利用 / Publication and Patents

論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)

口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.

特許 / Patents

特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件