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采用负压铸渗技术在ZGCr5Mo表面制备了镍基合金渗层,渗层厚度0.7～1.6mm。用扫描电镜、X射线衍射(XRD)、电子探针(EPMA)和硬度计等手段,分析了渗层的微观组织结构、渗层内元素分布、宏观/显微硬度等。结果表明:所得表面合金渗层组织致密,渗层与基体呈冶金熔合;渗层主要由Ni基固溶体、Ni3B、Cr3B、CrB等过饱和条件下形成的金属间化合物等相组成;渗层的镍基固溶体具备良好的韧性,金属间化合物等硬质起到强化作用,使渗层的硬度提高,宏观硬度可达56 HRC,显微硬度自渗层到基体呈梯度变化。
Ni-based alloy layer was prepared on the surface of ZGCr5Mo by negative pressure casting and infiltration technique. The thickness of the layer was 0.7 ~ 1.6mm. The microstructure and microstructure of the layer, the distribution of elements in the layer and the macro / micro hardness were analyzed by scanning electron microscopy, X-ray diffraction (XRD), electron probe (EPMA) and hardness tester. The results show that the obtained surface alloy is densely packed and the diffusion layer is metallurgically fused with the substrate. The diffusion layer is mainly composed of an intermetallic compound phase formed under the supersaturation condition of Ni-based solid solution, Ni3B, Cr3B, CrB, Based solid solution with good toughness, intermetallics and other hard play a role in strengthening, so that the hardness of the infiltrated layer, macroscopic hardness of up to 56 HRC, microhardness gradient from the diffusion layer to the substrate.