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PPBF-EB process of Al alloys and its phase trnsformation kinetics

Research Project

Project/Area Number 21K03801
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 18020:Manufacturing and production engineering-related
Research InstitutionTohoku University

Principal Investigator

Aoyagi Kenta  東北大学, 金属材料研究所, 助教 (90636044)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
KeywordsAdditive Manufacturing / Al合金 / 材料組織 / 相変態
Outline of Research at the Start

金属付加製造(金属用3Dプリンタ)は、複雑形状部材をコンピュータで設計した通りの形状で製造できるだけでなく、材料組織を制御することも可能である。このような特徴を有しているため、トポロジー最適化の活用による高比強度Al合金部材の更なる機能向上を目指し、金属付加製造による製造技術の確立に向けた研究が多く実施されている。
一方、材料組織を制御するためには、材料組織の形成を支配する因子を明らかにし、その因子を制御するための指針を確立しなくてはいけない。本研究では金属付加製造によるAl合金開発の指針を確立するために、金属付加製造特有の凝固現象と付加製造プロセス中に生じる組織変化挙動を明らかにする。

Outline of Final Research Achievements

In order to realize the PBF-EB process for Al alloys, we conducted the analysis of smoke behavior for Al alloy powder, process optimization and fabrication of defect-less Al alloy by PBF-EB,investigation of the dependence of microstructure on the building conditions, the analysis of microstructural change behavior after solidified. It was revealed that when the cooling rate was increased, a region, where fine precipitates aggregated, was formed in a layered form perpendicular to the building direction.It was considered that a solute-concentrated region formed in the solid-liquid coexistence region near the bottom of the melt pool with small flow velocity, and at this region as a nucleation site, fine precipitates were formed.
In addition, the temperature history could be estimated from the building log data and microstructure change behavior after solidified could be explained by this estimated temperature history.

Academic Significance and Societal Importance of the Research Achievements

本研究成果は、金属用3Dプリンタを用いてAl合金を造形する際に、形状だけでなく材料内部の組織を制御するための科学として重要性を持つ。例えば、急速凝固により、従来製法よりも過飽和にAlが固溶した晶出物が形成し、その後の時効で晶出物内部にAlが析出することを明らかにした。また、これまで実例のほぼない電子ビームを熱源に用いた金属用3Dプリンタで種々のAl合金を造形でき、レーザを熱源に用いた金属用3Dプリンタとは異なった組織を有し、造形時の温度履歴からその組織を推定できることを見出した。電子ビーム3DプリンタによるAl合金部材の製造のための基礎的知見として、実用及び社会的にもその意義は大きい。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (10 results)

All 2023 2022 2021

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (7 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Developing auto process mapping technique for powder bed fusion using an electron beam2023

    • Author(s)
      Aoyagi Kenta、Ono Manabu、Yanagihara Keiji、Wakoh Kimio、Chiba Akihiko
    • Journal Title

      Progress in Additive Manufacturing

      Volume: -- Issue: 5 Pages: 1437-1448

    • DOI

      10.1007/s40964-023-00535-3

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Microstructure evolution and hardness of S30C carbon steel produced by powder bed fusion using an electron beam and subsequent heat treatments2022

    • Author(s)
      Yunwei Gui, Huakang Bian, Kenta Aoyagi, Akihiko Chiba
    • Journal Title

      Materials Letters

      Volume: 328 Pages: 133096-133096

    • DOI

      10.1016/j.matlet.2022.133096

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Detection, classification and prediction of internal defects from surface morphology data of metal parts fabricated by powder bed fusion type additive manufacturing using an electron beam2022

    • Author(s)
      Gui Yunwei、Aoyagi Kenta、Bian Huakang、Chiba Akihiko
    • Journal Title

      Additive Manufacturing

      Volume: 54 Pages: 102736-102736

    • DOI

      10.1016/j.addma.2022.102736

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 電子ビーム粉末床溶融結合法における造形性のサイズ依存性2023

    • Author(s)
      青柳健大、柳原圭司、若生公朗、小野学、山中謙太、 千葉 晶彦
    • Organizer
      日本金属学会2023年秋期講演(第173回)大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 金属ペーストレーザ溶融法におけるスパッタ挙動2023

    • Author(s)
      衡威丞、青柳健大、千葉晶彦
    • Organizer
      日本金属学会2023年秋期講演(第173回)大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 電子ビーム積層造形法における機械学習を取り入れた最上表面性状判別法による造形欠陥予測制御2023

    • Author(s)
      Yunwei Gui、青柳健大、卞華康、山中謙太、千葉晶彦
    • Organizer
      日本金属学会2023年秋期講演(第173回)大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 電子ビーム積層造形におけるAl系合金粉末のスモーク現象に関する研究2023

    • Author(s)
      石岡 功己、青柳 健大、石神 健太、千葉 晶彦
    • Organizer
      日本金属学会2023年春期(第172回)講演大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Development of Ti6Al4V alloys with superior plasticity fabricated by powder bed fusion type additive manufacturing using an electron beam2022

    • Author(s)
      Yunwei Gui, Kenta Aoyagi, Akihiko Chiba
    • Organizer
      SMS2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Accelerate the fabrication of Ti-6Al-4V alloys by PBF-EB without internal defects via machine learning2021

    • Author(s)
      Yunwei Gui, Kenta Aoyagi, Akihiko Chiba
    • Organizer
      日本金属学会2021年秋期講演大会
    • Related Report
      2021 Research-status Report
  • [Presentation] An ensemble machine-learning approach for predicting and understanding the characteristics of ball milled powders for EB-PBF process2021

    • Author(s)
      Yunwei Gui, Kenta Aoyagi, Akihiko Chiba
    • Organizer
      粉体粉末冶金協会 2021年秋季大会
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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