Fatigue Properties of 3.5 GPa-grade Maraging Steels with or without Nitriding

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  • Yin Zhong da
    Department of Materials Science, Faculty of Engineering, Tohoku University
  • Suto Hajime
    Department of Materials Science, Faculty of Engineering, Tohoku University

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Other Title
  • 3.5 GPa級マルエージング鋼の窒化と疲労
  • 3 5GPaキュウ マルエージング コウ ノ チッカ ト ヒロウ

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Abstract

Fatigue properties of 3.5 GPa-grade maraging steels (8%Ni, 18 or 20%Co, 14 or 12%Mo) with or without nitriding were investigated. Data of specimens without nitriding were very scattered. When the age-hardened alloys were nitrided for 10 to 15 min at 500°C in NH3, mean values of fatigue strength were increased and the scatter bands were shrunk. After excess nitriding, the surface hardness was decreased and the specimens were embrittled. The role of non-metallic inclusions as sources of fatigue crack may be very important and clean materials were expected.

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