階層的な基底構造を持つ柔らかい2GPa鋼

Yunjie Li¹, Guo Yuan¹, Linlin Li¹

¹State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, People's Republic of China.

Science (New York, N.Y.)

|January 12, 2023

まとめ

研究者らは,2.2ギガパスカルの引力強さと20%の均一な伸長性を達成する新しい中等マンガン鋼を開発しました. 材料科学におけるこの突破は,様々な産業用途に強固で柔軟な負荷を負担能力を提供します.

科学分野:

材料科学
金属工学
機械工学

背景:

負荷を背負う材料で高い機械的強度と柔らかさを同時に達成することは,業界全体で重要な課題です.
既存の材料は,しばしば,輸送,軽量化,インフラにおけるアプリケーションを制限する.

研究の目的:

高張力で均一な伸長性を兼ね備えた普通の中間マンガンの鋼材を開発する.
この二重の性質を達成するために必要な微細構造設計と処理方法を調査する.

主な方法:

複数の横断鍛,冷凍処理,加熱段階を含む加工経路を使用する.
分散したオステニットとラミネートされ,トポロジカルに並べられたマルテンサイトで構成される結果の階層的な微細構造を分析します.

主要な成果:

加工された中等マンガン鋼の均等な伸長度が20%を超えた 2.2ギガパスカルの引力強度を達成した.
階層的な微細構造が物質の強化とダクティライゼーションのための複数のマイクロメカニズムを活性化することを示した.
マルテンサイトにおける脱位と変形刺激による相変換が,高可塑性への主要な貢献者であると特定された.

結論:

ナノ構造の設計戦略は,2ギガパスカルの強度と高可塑性を持つ鋼材を生産することができます.
開発された加工経路は,高度な高強度鋼鉄の大規模な工業生産のための有望なアプローチを提供します.
この材料は,頑丈で軽量な部品を必要とするセクターに大きな影響を与える可能性があります.

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