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Abstract <p>The role of molybdenum disulfide (MoS<sub>2</sub>) as a solid lubricant in iron-based powder metallurgy composites&#xa0;has been extensively investigated. However, current understanding of MoS<sub>2</sub>-modified&#xa0;Fe–C–Cu-based powder metallurgy composites&#xa0;remains incomplete. Therefore, this study investigates the microstructure evolution, mechanical properties, and tribological performance of Fe–1C–5Cu–<i>x</i>MoS<sub>2</sub> composites (<i>x</i> = 1.5, 3, 4.5, and 6) fabricated via cold pressing (600 MPa) and vacuum sintering (1150°C, 60 min) with controlled heating rate (8.5 K/min). Microstructure analysis reveals that increasing MoS<sub>2</sub> content promotes FeS phase, Fe<sub>3</sub>Mo<sub>3</sub>C phase precipitates, and expansion of pearlitic lamellar spacing but induces severe MoS<sub>2</sub> agglomeration. The 3 wt % MoS<sub>2</sub> composite achieves peak hardness (303 HV), 20% higher than the base alloy (253 HV), while 1.5 wt % MoS<sub>2</sub> yields maximum compressive strength (1005 MPa), surpassing the base alloy by about 200% (336 MPa). The improvement of hardness and compressive strength is attributed to the solid solution strengthening effect of Mo atoms derived from MoS<sub>2</sub> decomposition. Furthermore, the 6&#xa0;wt % MoS<sub>2</sub> composite exhibits the lowest coefficient of friction (COF), attributed to the formation of MoS<sub>2</sub>/FeS lubricating films. However, excessive MoS<sub>2</sub> agglomeration degrades mechanical properties.</p>

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Effects of MoS2 Addition on the Microstructure and Properties of Powder Metallurgy Processed Fe–1C–5Cu–xMoS2 Composites

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Fuquan Wang,
  • Wenzhen Zhong,
  • Guangbin Duan,
  • Dengchao Sun

摘要

Abstract

The role of molybdenum disulfide (MoS2) as a solid lubricant in iron-based powder metallurgy composites has been extensively investigated. However, current understanding of MoS2-modified Fe–C–Cu-based powder metallurgy composites remains incomplete. Therefore, this study investigates the microstructure evolution, mechanical properties, and tribological performance of Fe–1C–5Cu–xMoS2 composites (x = 1.5, 3, 4.5, and 6) fabricated via cold pressing (600 MPa) and vacuum sintering (1150°C, 60 min) with controlled heating rate (8.5 K/min). Microstructure analysis reveals that increasing MoS2 content promotes FeS phase, Fe3Mo3C phase precipitates, and expansion of pearlitic lamellar spacing but induces severe MoS2 agglomeration. The 3 wt % MoS2 composite achieves peak hardness (303 HV), 20% higher than the base alloy (253 HV), while 1.5 wt % MoS2 yields maximum compressive strength (1005 MPa), surpassing the base alloy by about 200% (336 MPa). The improvement of hardness and compressive strength is attributed to the solid solution strengthening effect of Mo atoms derived from MoS2 decomposition. Furthermore, the 6 wt % MoS2 composite exhibits the lowest coefficient of friction (COF), attributed to the formation of MoS2/FeS lubricating films. However, excessive MoS2 agglomeration degrades mechanical properties.