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Fabrication of functionally-graded beta titanium alloy as biomaterial by means of additive manufacturing

Research Project

Project/Area Number 19K04070
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 18010:Mechanics of materials and materials-related
Research InstitutionGifu University

Principal Investigator

Uematsu Yoshihiko  岐阜大学, 工学部, 教授 (80273580)

Co-Investigator(Kenkyū-buntansha) 柿内 利文  岐阜大学, 工学部, 准教授 (20452039)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords積層造形 / 複合構造 / チタン合金 / 強度特性
Outline of Research at the Start

本研究では,は高い耐久性と低弾性係数を併せ持つ生体用のβ-Ti合金を3D積層造形によって作製する.さらに発展的な目的として,積層造形によって弾性係数が傾斜的に低下する表面Ti-6Al-4V層をβ-Ti合金上に作製し,骨との力学的親和性の高い構造を提案する.最終的には,両構造を適所に用いることにより,テーラード・デザイン(人工骨のように,個人の特性にマッチした多品種少量の設計,および構造体の中で弾性係数のような材料特性が徐々に変化するような傾斜的な設計の意)のコンセプトを確立することが目的である.

Outline of Final Research Achievements

A material with functionally-graded structure was created by 3D additive manufacturing. A hybrid structure was fabricated using maraging steel or Ti-6Al-4V alloy, which is a molten material, as a base material. Each powder was deposited on the base metal by selective laser melting (SLM). The dissimilar metal hybrid structure was also fabricated using Ti-6Al-4V powder deposited on beta-type titanium alloy, Gum-metal. The boundary between the molten material and the deposited part forms irregularities because the molten powder resolidifies on the substrate. But in the case of dissimilar metal hybrid structure, the substrate, Gum-metal, has a lower melting point than the Ti-6Al-4V alloy. Therefore, it was confirmed that the unevenness of the interface became severe. It was also clarified that the strength of the hybrid structure is mainly dominated by the strength of the deposited part.

Academic Significance and Societal Importance of the Research Achievements

積層造形は複雑形状を比較的容易に作製できる手法として注目されているが,溶製材上に積層造形を施したいわゆるハイブリッド構造については研究が行われていなかった.本研究では,同種金属だけでなく,Ti-6Al-4V合金とベータ型チタン合金の組合せで異種金属ハイブリッド構造が作製可能である点を示した点は,工業的な意義が大きい.このような異種金属ハイブリッド構造は,基材と積層部で弾性係数が異なる傾斜構造となっており,医療用インプラントのような医療用構造としての実用化が期待できる.また,ハイブリッド構造の強度が積層部強度に主に支配されることを明らかにした点は,構造体の信頼性設計に応用することが可能である.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (4 results)

All 2021 2019

All Journal Article (1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Microstructures and Fatigue Behavior of Additively Manufactured Maraging Steel Deposited on Conventionally Manufactured Base Plate2021

    • Author(s)
      Uematsu Yoshihiko、Kakiuchi Toshifumi、Nakajima Masaki、Matsuo Kento
    • Journal Title

      Journal of Materials Engineering and Performance

      Volume: - Issue: 7 Pages: 4902-4910

    • DOI

      10.1007/s11665-021-05548-z

    • Related Report
      2020 Research-status Report
  • [Presentation] Fatigue behaviour of additively-manufactured Ti-6Al-4V deposited on conventionally- melted base plate2021

    • Author(s)
      Yoshihiko Uematsu, Toshifumi Kakiuchi, Kengo Sakai
    • Organizer
      Engineering Integrity Society: Fatigue 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 積層造形された純Tiラティス構造の引張り-圧縮疲労挙動2021

    • Author(s)
      丹羽樹生,柿内利文,植松美彦
    • Organizer
      日本材料学会 材料Week材料シンポジウム 若手学生研究発表会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 溶製材と積層造形材の二層構造を有するマルエージング鋼における疲労挙動2019

    • Author(s)
      松尾健人
    • Organizer
      日本機械学会 令和元年度材料力学部門講演会(M&M2019)
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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