Experimental Investigation of Hot Working Behavior of Cemented Carbide by Tracer Particle Tracking

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05086
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26050:Material processing and microstructure control-related
• Research Institution: Tomakomai National College of Technology
• Principal Investigator: TAKAZAWA Kohji 苫小牧工業高等専門学校, 創造工学科, 准教授 (20331952)
• Co-Investigator(Kenkyū-buntansha): 浅見 廣樹 苫小牧工業高等専門学校, 創造工学科, 准教授 (00547961)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 超硬合金 / 熱間加工 / 塑性加工

Outline of Final Research Achievements

Deformation behavior during hot working of cemented carbide by electric heating and pressure through a graphite die was estimated from the distribution of tracer particles. In the work piece, the area in contact with the graphite die is subject to deformation constraint, and the inside mainly becomes a compressive stress field, and plastic flow occurs toward the free surface. The area near the free surface is mainly a tensile stress field, and in some cases, voids are formed. It is suggested that the amount of these deformations can be calculated from the shape change of the region containing tracer particles.

Free Research Field

機械材料学

Academic Significance and Societal Importance of the Research Achievements

超硬合金は硬さと靭性を高度に両立した材料として産業に必要不可欠である．しかし，その原材料のタングステンおよびコバルトは希少元素であり，供給には地政学的なリスクも大きい．本研究の成果は，単純形状の超硬合金素材に除去加工を用いずに形状を付与する技術の基礎となるものであり，加工屑になる希少資源の量を減らすことができる．また，既存の加工方法よりも消費電力を低減できる可能性もあり，省資源省エネルギーに寄与するものとなる．