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<p>This paper investigates high-frequency induction brazing of YG15 cemented carbide and Q235B steel using an Ag-based composite filler metal, focusing on how temperatures (660&#xa0;°C, 680&#xa0;°C, 700&#xa0;°C, 720&#xa0;°C, 740&#xa0;°C) affect joint microstructure and shear performance. Through SEM, EDS, shear strength, and hardness tests, it analyzes the link between microstructural changes and joint properties. Results show brazed joints comprise a diffusion reaction layer on the YG15 side, an Ag-based filler layer, and a diffusion reaction layer on the Q235B side, with Cu-Zn solid solution as the main strengthening phase. At 680&#xa0;°C, joints achieve maximum shear strength (288&#xa0;MPa): the YG15 diffusion layer (2.63&#xa0;μm) is moderately thick, Cu-Zn solid solution distributes uniformly with coordinated sizes, hardness values near YG15 and Q235B sides reach 462.57 HV and 153.96 HV respectively, interfaces bond tightly, and voids are minimal. Temperatures ≥ 700&#xa0;°C cause excessive Co diffusion and intensified Cd evaporation; 660&#xa0;°C leads to insufficient diffusion and lower bonding strength. Thus, 680&#xa0;°C is optimal for this system, with good strength-toughness matching achievable by regulating diffusion and filler layer microstructures.</p>

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Effect of brazing temperature on microstructure and properties of YG15/Q235 brazed joints

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Quan Wang,
  • Yuming Che,
  • Qilong Tan,
  • Yan Li,
  • Cuirong Liu,
  • Mu Zeng

摘要

This paper investigates high-frequency induction brazing of YG15 cemented carbide and Q235B steel using an Ag-based composite filler metal, focusing on how temperatures (660 °C, 680 °C, 700 °C, 720 °C, 740 °C) affect joint microstructure and shear performance. Through SEM, EDS, shear strength, and hardness tests, it analyzes the link between microstructural changes and joint properties. Results show brazed joints comprise a diffusion reaction layer on the YG15 side, an Ag-based filler layer, and a diffusion reaction layer on the Q235B side, with Cu-Zn solid solution as the main strengthening phase. At 680 °C, joints achieve maximum shear strength (288 MPa): the YG15 diffusion layer (2.63 μm) is moderately thick, Cu-Zn solid solution distributes uniformly with coordinated sizes, hardness values near YG15 and Q235B sides reach 462.57 HV and 153.96 HV respectively, interfaces bond tightly, and voids are minimal. Temperatures ≥ 700 °C cause excessive Co diffusion and intensified Cd evaporation; 660 °C leads to insufficient diffusion and lower bonding strength. Thus, 680 °C is optimal for this system, with good strength-toughness matching achievable by regulating diffusion and filler layer microstructures.