Function creation in additive manufacturing using Mg alloys and dissimilar metals with wire arc discharge

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02038
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 18020:Manufacturing and production engineering-related
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: Sasahara Hiroyuki 東京農工大学, 工学(系)研究科(研究院), 教授 (00205882)
• Co-Investigator(Kenkyū-buntansha): 阿部 壮志 埼玉大学, 理工学研究科, 助教 (60756469) ; 中本 圭一 東京農工大学, 工学(系)研究科(研究院), 准教授 (90379339)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: アディティブ・マニュファクチャリング / マグネシウム合金 / 異種金属造形

Outline of Final Research Achievements

In additive manufacturing utilizing wire material and arc discharge, a magnesium alloy, which is a lightweight and high specific-strength metal, can be applied for fabrication with high precision by active cooling with solid block contact to the supplied molten metal. Furthermore, on the surface layer, the possibility of deposition of dissimilar metals such as Ti alloy and Al alloy, which have superior heat resistance, corrosion resistance and wear resistance compared to Mg alloy, was investigated. The metallographic state and bond strength at the interface were also clarified. Although the metallurgical bonding strength of these combinations is low due to the formation of intermetallic compounds at the interfaces between dissimilar metals, the additive process itself is feasible.

Free Research Field

生産加工学

Academic Significance and Societal Importance of the Research Achievements

Mg合金は軽量で比強度が高いが，粉末状態では粉塵爆発や燃焼が生じやすいため，粉末材料を用いる一般的な金属AMでの造形が難しい．ワイヤー・アーク方式と固体接触による冷却により，安全かつ精度良くMg合金を造形できることを示した．Mg合金とTi合金，Al合金の異種金属積層における界面での金属間化合物生成の状態を明らかにし，Mg合金表面の硬度の高い金属を積層することができた．金属間化合物の状態は，投入エネルギ量と造形物の温度状態により大きな影響を受けることを明らかにした．低入熱条件では接合状態は悪いが，成分希釈のないTi合金を積層できることを明らかにした．