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<p>This study investigates the impact of Ti addition (0-2.5 wt.%) on the microstructure, carbide distribution, and wear resistance of high-chromium cast iron (HCCI) sintered wear-resistant layers subjected to systematic solution heat treatment. Without Ti, the microstructure comprises α′ (martensite), RA (retained austenite), and γ (austenite) phases, with M<sub>7</sub>C<sub>3</sub> carbides exhibiting a leaf-like, discontinuous network. Ti addition transforms carbide morphology to rod-like or band-like, refining M<sub>7</sub>C<sub>3</sub> carbides and introducing localized TiC particles. The hardness of C-carbides remains around 800 HV<sub>0.3</sub>, with similar trends for AC-carbides and bulky carbides. The 1Ti layer (1 wt.% Ti) shows superior wear resistance under low loads (150N-200N) but declines under high loads (250N-300N). The 1.8Ti layer (1.8 wt.% Ti) exhibits refined carbides (24.82%) with improved roundness and squareness, although wear resistance is slightly lower than 1Ti. Under low loads, the matrix shows minimal plastic deformation, but significant deformation occurs under high loads. The 2.5Ti layer (2.5 wt.% Ti) sees a reduced carbide proportion (22.30%) due to increased TiC precipitation. Wear mechanisms under low loads include grooves, delamination pits, and micro-fatigue, while high loads primarily involve grooves and micro-fatigue.</p>

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Microstructure and Wear Behavior of Ti-Modified Sintered High Chromium Cast Iron Layers

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Guangci Li,
  • Hang Dong,
  • Yongcun Li,
  • Wenjun Zhu,
  • Yong Wang

摘要

This study investigates the impact of Ti addition (0-2.5 wt.%) on the microstructure, carbide distribution, and wear resistance of high-chromium cast iron (HCCI) sintered wear-resistant layers subjected to systematic solution heat treatment. Without Ti, the microstructure comprises α′ (martensite), RA (retained austenite), and γ (austenite) phases, with M7C3 carbides exhibiting a leaf-like, discontinuous network. Ti addition transforms carbide morphology to rod-like or band-like, refining M7C3 carbides and introducing localized TiC particles. The hardness of C-carbides remains around 800 HV0.3, with similar trends for AC-carbides and bulky carbides. The 1Ti layer (1 wt.% Ti) shows superior wear resistance under low loads (150N-200N) but declines under high loads (250N-300N). The 1.8Ti layer (1.8 wt.% Ti) exhibits refined carbides (24.82%) with improved roundness and squareness, although wear resistance is slightly lower than 1Ti. Under low loads, the matrix shows minimal plastic deformation, but significant deformation occurs under high loads. The 2.5Ti layer (2.5 wt.% Ti) sees a reduced carbide proportion (22.30%) due to increased TiC precipitation. Wear mechanisms under low loads include grooves, delamination pits, and micro-fatigue, while high loads primarily involve grooves and micro-fatigue.