髪の毛 が 鉄 を 変形 する 方法
Gianluca Roscioli1, Seyedeh Mohadeseh Taheri-Mousavi1,2, Cemal Cem Tasan3
1Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
まとめ
硬い鋼は,複雑な相互作用により,柔らかい材料を切るときに失敗します. ラットマーテンサイト構造の空間的変動は,混合モードのクラッキングを引き起こし,重要な磨きが起こる前にツールが故障する.
科学分野:
- 材料科学
- トリボロジー
- 金属工学
背景:
- マルテンシート微細構造,高炭化物含有量,コーティングの鋼は硬さと耐磨性のために設計されています.
- 毛やチーズやジャガイモのような 柔らかい材料を切るときに これらのツール・スチールは失敗します 機械的な理解が欠けている日常的な観察です
- 材料と変形条件の複雑な相互作用は,故障マイクロメカニズムの理解を妨げています.
研究 の 目的:
- より柔らかい材料を切る際に硬化鋼の故障の原因となる微細なメカニズムを解明する.
- 観測された材料の故障におけるマルテンサイト微細構造の役割を調査する.
- 工具鋼の切断から磨きへの移行を理解する.
主な方法:
- 断絶した切断試験は,専門のマイクロメカニカルテストセットアップを使用して行われました.
- 電子顕微鏡を用いて,微小スケールでの変形と断裂の過程を観察した.
- 実験的発見を補完するために,分析的および数学的調査が行われました.
主要な成果:
- ラットマーテンサイト構造内の空間的変動は,材料の故障の重要な要因として特定されました.
- 混合モードII-IIIのクラッキング現象が観察されました.
- この破裂は,材料の著しい磨きが始まる前に発生し,早めの故障を説明します.
結論:
- ラット・マーテンサイトの微細構造的異質性は,ソフトな材料を切るツール・スチールにおける過早な故障の主な原因である.
- このミックスモードのクラッキングメカニズムを理解することは,より堅固な切削工具の設計に不可欠です.
- マイクロ構造と性質の関係に関するさらなる研究は,ツールの性能と長寿を高めることができます.
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