Effect of Mo on microstructure and strength and toughness of Fe-Co-Cr bearing steel

doi:10.13251/j.issn.0254-6051.2025.03.025

Abstract

Abstract: Effect law and mechanism of molybdenum (Mo) element on the microstructure and room-temperature mechanical properties of Fe-Co-Cr bearing steel were investigated. The results show that the addition of Mo increases the variety of major secondary phases in the tested steel. In the 0%Mo steel, the primary secondary phase is M₂₃C₆. In the 2%Mo steel, the primary secondary phases change to M₂₃C₆ and Laves phase. In the 4.6%Mo steel, the primary secondary phases become M₂₃C₆, Laves phase and M₆C. The addition of Mo element increases the volume fraction of retained austenite and dislocation density, and refines the width of martensite laths. As the Mo content increases, the strength, impact property and hardness of the tested steel show upward trends.

Key words: bearing steel, molybdenum element, mechanical properties, second phase

CLC Number:

TG142.1

Guo Chuncheng, Chi Hongxiao, Gu Jinbo, Dong Lili, Zhu Liuping. Effect of Mo on microstructure and strength and toughness of Fe-Co-Cr bearing steel[J]. Heat Treatment of Metals, 2025, 50(3): 150-157.

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