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<p>Aiming at the problem of high early failure rate of PDC drill bit joints caused by brazing, this paper studies the effects of base material, silver brazing filler and quenching and tempering process on the joint performance through orthogonal experiments. The materials were characterized by shear strength test, hardness test, scanning electron microscopy, and energy dispersive spectrometer. The results show that quenching and tempering make 42CrMo steel form a tempered bainite structure, and the hardness increases to 290.8 HBW. The brazed joint tissue of sample No. 4 is fine and uniform, with no obvious defects. This is because cadmium and silver synergistically enhance the wettability of the brazing filler, promoting the refinement of the copper-rich phase into a dispersed island structure. Its shear strength is 355.4&#xa0;MPa, and the fracture surface shows typical ductile fracture, with good plastic deformation ability. This provides an optimized brazing process for PDC drill bits.</p>

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Research on microstructure regulation and mechanical performance optimization of PDC bit joints based on orthogonal experiments

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Lamei Peng,
  • Nana Zhang,
  • Sheng Yang,
  • Longlong Zhang,
  • Zehao You

摘要

Aiming at the problem of high early failure rate of PDC drill bit joints caused by brazing, this paper studies the effects of base material, silver brazing filler and quenching and tempering process on the joint performance through orthogonal experiments. The materials were characterized by shear strength test, hardness test, scanning electron microscopy, and energy dispersive spectrometer. The results show that quenching and tempering make 42CrMo steel form a tempered bainite structure, and the hardness increases to 290.8 HBW. The brazed joint tissue of sample No. 4 is fine and uniform, with no obvious defects. This is because cadmium and silver synergistically enhance the wettability of the brazing filler, promoting the refinement of the copper-rich phase into a dispersed island structure. Its shear strength is 355.4 MPa, and the fracture surface shows typical ductile fracture, with good plastic deformation ability. This provides an optimized brazing process for PDC drill bits.