利用報告書 / User's Reports

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【公開日:2025.06.10】【最終更新日:2025.05.13】

課題データ / Project Data

課題番号 / Project Issue Number

24OS0016

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

大阪大学 / Osaka 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)マテリアルの高度循環のための技術/Advanced materials recycling technologies

キーワード / Keywords

電子顕微鏡/ Electronic microscope,3D積層技術/ 3D lamination technology


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 工学研究科

共同利用者氏名 / Names of Collaborators Excluding Supporters in the Hub and Spoke Institutes
ARIM実施機関支援担当者 / Names of Supporters in the Hub and Spoke Institutes
利用形態 / Support Type

(主 / Main)技術補助/Technical Assistance(副 / Sub),機器利用/Equipment Utilization


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

OS-003:200kV原子分解能走査透過分析電子顕微鏡
OS-005:複合ビーム3次元加工・観察装置
OS-012:200kV回折コントラスト電子顕微鏡


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) is currently the most versatile metal additive manufacturing (MAM) process, enabling the production of complex parts without the design limitations of traditional manufacturing methods. The rapid and repeated thermal cycles create intense thermal gradients, leading to metastable chemical, structural, and mechanical states, resulting in metallurgical defects that compromise material properties. Extensive research of LPBF-processed 316L SS has been conducted to improve the mechanical properties and highlight the need to correlate different microstructural features with the manufacturing process. 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 to better understand the relationship between solidification microstructure and process parameters.

実験 / Experimental

A basic set of process parameters was selected for manufacturing the studied specimens. Microstructural characterization was performed on the as-built specimens without heat treatment.  Microstructural features were observed by scanning electron microscopy (SEM, JSM-7001F, JEOL, Tokyo, Japan) and transmission electron microscopy (TEM, JEM-2100PUS, JEM-ARM200F, JEOL Ltd., Tokyo, Japan). 

結果と考察 / Results and Discussion

A novel method has been successfully proposed to clarify the segregation behavior of melt pool boundary (MPB) by controlling the crystallographic texture of 316L SS through unique LPBF processing parameters to obtain a single-crystal-like microstructure of the cellular structures along the laser scanning direction. The accurate location of the track-track MPB is distinguishable by means of the transverse and longitudinal cellular dislocation structures on both sides. The edge-on state of the track-track MPB makes the quantitative concentration analysis precisely using HAADF-STEM with energy-dispersive X-ray spectroscopy, which is in good agreement with the Scheil-Gulliver solidification simulations

図・表・数式 / Figures, Tables and Equations


Quantitative revealing the solute segregation behavior at melt pool boundary in additively manufactured stainless steel using a novel processing method for precise positioning by HAADF-STEM


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)
  1. Fei Sun, Quantitative revealing the solute segregation behavior at melt pool boundary in additively manufactured stainless steel using a novel processing method for precise positioning by HAADF-STEM, Materials Characterization, 217, 114435(2024).
    DOI: 10.1016/j.matchar.2024.114435
口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.
  1. [1] Fei Sun, Yoshitaka Adachi, Kazuhisa Sato, Takuya Ishimoto, Takayoshi Nakano, Yuichiro Koizumi, Nano-scaled solidification microstructure characteristics in additively manufactured 316L stainless steel, 13th Asia Pacific Microscopy Congress 2025 (APMC13), Brisbane, Australia, 2-7 February 2025.
  2. [2] Fei Sun, Yoshitaka Adachi, Kazuhisa Sato, Takuya Ishimoto, Takayoshi Nakano, Yuichiro Koizumi, Nano-scaled solidification microstructure characteristics in additively manufactured 316L stainless steel, 34th Annual Meeting of MRS-J, 2024. 12.16-18.
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

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