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Understanding of microstructure and shape memory characteristics of SLM Ti-Nb alloys

Research Project

Project/Area Number 21K03814
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 InstitutionNational Institute for Materials Science

Principal Investigator

WATANABE MAKOTO  国立研究開発法人物質・材料研究機構, 構造材料研究センター, 副センター長 (00391219)

Co-Investigator(Kenkyū-buntansha) 草野 正大  国立研究開発法人物質・材料研究機構, 構造材料研究センター, 主任研究員 (60822583)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsレーザ粉末床溶融結合法 / Ti-Nb / 三次元積層造形 / 形状記憶特性 / 超弾性 / Ti-Nb合金 / 形状記憶合金 / 選択的レーザ溶融法
Outline of Research at the Start

レーザ積層造形プロセスによるTi-Nb系形状記憶合金部材の作成を試み、プロセス条件と造形組織、形状記憶効果との相関について明らかにする。特に造形時の急熱急冷組織と特性、熱処理後の組織と特性の相関について調査を進める。

Outline of Final Research Achievements

In this study, Ti-42wt.%Nb alloys were fabricated by laser powder bed fusion and the effects of process conditions and solution treatment on the microstructure and superelastic properties of the specimens were investigated. It was found that the amount of precipitates increased with increasing laser energy density, and that the precipitates consisted of α and α'' phases, which were also increased by solution treatment. Superelastic behaviour was also observed, although the superelastic recovery strain was less than that of the cast material, with a maximum of about 0.32%. The highest recovery strain was observed under laser conditions with low precipitation, suggesting the influence of precipitation. It was expected that the superelastic properties could be improved in the future by controlling the crystal orientation.

Academic Significance and Societal Importance of the Research Achievements

レーザ積層造形(LPBF)プロセスの形状記憶合金への適用研究は、Ni-Tiに限られた状態となっているが、Ni-Tiは金属アレルギーの原因となるNiを含有することから、本研究ではNiを含まないTi-Nb系に着目し、その造形プロセスの最適化や超弾性特性について評価を行った。これまでに十分に調査されていない材料系に対して調査することで、新しい多くの知見を得ることができ、またLPBFならではの課題が明らかになった。LPBF法の利点を生かしつつ、安全かつ高性能な新しい形状記憶部材の開発につながるとともに、今後解明すべき学術的課題を明らかにすることが出来た。

Report

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

    (4 results)

All 2023 2022 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (2 results) Remarks (1 results)

  • [Journal Article] Microstructure and phase evolution of functionally graded multi-materials of Ni-Ti alloy fabricated by laser powder bed fusion process2023

    • Author(s)
      Daram Phuangphaga、Hiroto Takanobu、Watanabe Makoto
    • Journal Title

      Journal of Materials Research and Technology

      Volume: 23 Pages: 5559-5572

    • DOI

      10.1016/j.jmrt.2023.02.151

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Ti-42Nbのレーザ積層造形条件と組織および超弾性特性の相関2022

    • Author(s)
      朱 薪喆, 薇 楽絲, 湯本 敦史, 渡邊 誠
    • Organizer
      日本金属学会 2022年秋期(第171回) 講演大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Microstructure and Phase Evolution of Functionally Graded Multi-Materials of Ni-Ti Alloy Fabricated by Laser Powder Bed Fusion Process2022

    • Author(s)
      Phuangphaga DARAM, Takanobu HIROTO, Makoto WATANABE
    • Organizer
      日本金属学会 2022年秋期(第171回) 講演大会
    • Related Report
      2022 Research-status Report
  • [Remarks] 物質・材料研究機構 構造材料研究センター 積層材料グループ

    • URL

      https://www.nims.go.jp/research/group/additive-manufacturing/

    • Related Report
      2022 Research-status Report

URL: 

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

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