Scholarlink

<p>This study systematically elucidates the regulatory mechanism of silicon (Si) addition on microstructural evolution and machining performance of HPb58-3 leaded brass. Microstructural characterization reveals that increasing Si content (0.01–0.1&#xa0;wt.%) transforms <i>α</i>-phase morphology from lamellar to discrete island-shaped structures with progressive refinement. Si addition significantly modifies Pb particle characteristics: at 0.1 wt.% Si, Pb volume fraction increases to 1.77% with improved distribution uniformity, while promoting Fe<sub>3</sub>Si intermetallic phase precipitation. TEM analysis confirms the Fe<sub>3</sub>Si phase with characteristic interplanar spacing of 0.283 nm, which refines as-cast microstructure through grain boundary Zener pinning. Machining tests demonstrate optimal performance in 0.1 wt.% Si alloy, exhibiting 3.79–10.27% reduction in triaxial cutting forces. This enhancement originates from multiplied crack nucleation sites due to increased Pb particle density and synergistic effects of Fe<sub>3</sub>Si phase refinement and volume fraction elevation on crack initiation. Hot processing maps indicate superior energy dissipation capacity (<i>η</i> = 39–56%) in 0.1 wt.% Si alloy, suggesting enhanced dynamic recrystallization propensity, providing theoretical guidance for thermo-mechanical processing optimization.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of Si Addition on the Microstructure, Machinability, and Hot Deformation Behavior of HPb58-3 Brass Alloy

  • 期刊论文

  • 发表日期：

    2025年3月31日

查看全文
  • Chengjun Guo,
  • Shouwen Shen,
  • Biao Zhang,
  • Yichuan Jiang,
  • Lixia Shi,
  • Xianglong Xu

摘要

This study systematically elucidates the regulatory mechanism of silicon (Si) addition on microstructural evolution and machining performance of HPb58-3 leaded brass. Microstructural characterization reveals that increasing Si content (0.01–0.1 wt.%) transforms α-phase morphology from lamellar to discrete island-shaped structures with progressive refinement. Si addition significantly modifies Pb particle characteristics: at 0.1 wt.% Si, Pb volume fraction increases to 1.77% with improved distribution uniformity, while promoting Fe3Si intermetallic phase precipitation. TEM analysis confirms the Fe3Si phase with characteristic interplanar spacing of 0.283 nm, which refines as-cast microstructure through grain boundary Zener pinning. Machining tests demonstrate optimal performance in 0.1 wt.% Si alloy, exhibiting 3.79–10.27% reduction in triaxial cutting forces. This enhancement originates from multiplied crack nucleation sites due to increased Pb particle density and synergistic effects of Fe3Si phase refinement and volume fraction elevation on crack initiation. Hot processing maps indicate superior energy dissipation capacity (η = 39–56%) in 0.1 wt.% Si alloy, suggesting enhanced dynamic recrystallization propensity, providing theoretical guidance for thermo-mechanical processing optimization.