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<p>Selective laser brazing (SLB) is a promising technique for fabricating high-performance diamond tools with desired grain patterns or structures. As the quality of SLBed diamond tools depends heavily on the individual tracks due to the track-by-track process, this study explores the single-track deposition of Ni–Cr alloys on a steel substrate for SLBed diamond tools. The track’s morphology and melt pool geometric dimensions were analyzed and correlated with the linear energy density (LED) to investigate the transitions of the scanned tracks and to determine optimal processing parameters. Energy dispersive spectroscopy (EDS) mapping was applied to investigate the element distribution inside the melt pools and gain insight into the formation mechanism and mixing behavior of powder and substrate materials. Results demonstrated that recoil force, Marangoni effect, and surface tension induce severe chemical segregation. Furthermore, distinct microstructure and nanohardness inside melt pools in conduction and keyhole modes were studied, taking into account the influence of chemical segregation. The results in this study represent new insights into melt pool formation and provide guidance on the fabrication of high-performance diamond tools.</p>

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Single track formation in selective laser brazing of Ni–Cr alloy for diamond tools: morphology and microstructure

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Shuai Li,
  • Qinghong Jiang,
  • Jianhua Yao,
  • Zhimeng Rao,
  • Cong Zhou,
  • Bi Zhang

摘要

Selective laser brazing (SLB) is a promising technique for fabricating high-performance diamond tools with desired grain patterns or structures. As the quality of SLBed diamond tools depends heavily on the individual tracks due to the track-by-track process, this study explores the single-track deposition of Ni–Cr alloys on a steel substrate for SLBed diamond tools. The track’s morphology and melt pool geometric dimensions were analyzed and correlated with the linear energy density (LED) to investigate the transitions of the scanned tracks and to determine optimal processing parameters. Energy dispersive spectroscopy (EDS) mapping was applied to investigate the element distribution inside the melt pools and gain insight into the formation mechanism and mixing behavior of powder and substrate materials. Results demonstrated that recoil force, Marangoni effect, and surface tension induce severe chemical segregation. Furthermore, distinct microstructure and nanohardness inside melt pools in conduction and keyhole modes were studied, taking into account the influence of chemical segregation. The results in this study represent new insights into melt pool formation and provide guidance on the fabrication of high-performance diamond tools.