报道了对ＮｉＣｒＳｉＢ激光熔敷合金中共晶组织的研究和观察，将共晶中的第二相标定为Ｎｉ３１Ｓｉ１２。γ′（Ｎｉ３Ｓｉ）相与γ（Ｎｉ，Ｃｒ）相共存于枝晶中，共晶包围着枝晶形成合金的基体，其上弥散分布着硬质强化相ＣｒＢ，Ｎｉ３Ｂ和Ｍ２３（ＣＢ）６。研究方法包括ＳＥＭ（扫描电子显微镜），电子探针，ＸＲＤ（Ｘ射线衍射），ＥＤＡＸ（能谱分析）和波谱分析等 The eutectic microstructure of NiCrSiB laser cladding alloy has been reported. The second phase of the eutectic is identified as Ni31Si12. The γ ’(Ni3Si) phase and the γ (Ni, Cr) phase coexist in the dendrite, and the eutectic surrounds the dendrite-forming matrix. The hard reinforcing phases CrB, Ni3B and M23 (CB) 6 are dispersedly distributed thereon. Research methods include SEM (scanning electron microscopy), electron probe, XRD (X-ray diffraction), EDAX (energy spectrum analysis) and spectral analysis