脆い金属間化合物により,超強度の低密度鋼が作られ,柔軟性が高くなります

Sang-Heon Kim¹, Hansoo Kim¹, Nack J Kim¹

¹Graduate Institute of Ferrous Technology, POSTECH, Pohang 790-784, South Korea.

Nature

|February 6, 2015

まとめ

研究者らは,高アルミニウム合金鋼の新型合金を開発した. この高度な軽鋼は,強度と柔軟性を高めるために特定のインターメタリック化合物を使用し,チタン合金よりも性能が優れています.

科学分野:

マテリアルサイエンス材料科学
メタルルジーは,金属の製造業です.
機械工学の機械工学

背景:

自動車製造における鉄鋼の優位性は,特定の強度が低いため,減少しています.
軽量材料は,車両の燃料効率と性能を改善するために求められています.
高アルミニウム鋼は密度が低いが,脆さという課題に直面している.

研究の目的:

特定の強度と柔らかさを改善した高アルミニウム低密度鋼を開発する.
強化段階として脆い金属間化合物の使用を調査する.
高アルミニウム含有量に関連した柔らかさの制限を克服するために.

主な方法:

アルミニウム含有量が高い合金鋼.
インターメタリック化合物の降水のための触媒としてニッケルを使用する.
FeAl型 (B2) インターメタル化合物の形態と分散を制御する.
コールドローリングされた板鋼の熱処理.

主要な成果:

高アルミニウム低密度鋼を開発し,特異的な張力強さと柔らかさを強化しました.
強化段階として,脆いFeAl型 (B2) インターメタリック化合物を成功裏に組み込みました.
ニッケル添加がナノメートルの大きさのB2粒子の形成を促進することを実証しました.
最先端のチタンの合金と比較して優れた機械性能を達成しました.

結論:

インターメタリック化合物は,軽鋼の合金設計に効果的に利用できます.
制御された形態学と金属間相の分散は,柔らかさの問題を軽減します.
開発された鋼は,高強度対重量比を必要とする構造用途の有望性を示しています.

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