The influence of a static magnetic field on microstructure evolution during laser direct energy deposition was studied. Our results reveal that dendrite spacing increases with increasing magnetic field flux density (MFFD). Moreover, electron backscatter diffraction results reveal that the epitaxial growth was preferred with increasing MFFD. We discuss these findings in terms of the influence of a magnetic field on melt convection and propose that an applied magnetic field effectively limits Marangoni convection.

中文翻译：

---

静态磁场对激光定向能量沉积镍基高温合金组织的影响

研究了静态磁场对激光直接能量沉积过程中微观组织演变的影响。我们的结果表明，枝晶间距随着磁场通量密度（MFFD）的增加而增加。此外，电子背散射衍射结果表明，随着MFFD的增加，外延生长是优选的。我们根据磁场对熔体对流的影响来讨论这些发现，并提出施加的磁场有效地限制了Marangoni对流。