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利用等离子束对灰铸铁和球墨铸铁进行熔凝处理,探讨铸铁中石墨的形状对熔凝层深的影响。等离子束熔凝处理后,使用扫描电镜(SEM)和X射线衍射仪(XRD)对熔凝层的形貌和组织进行分析。在SEM图片上测量熔凝层深。熔凝试样的截面硬度分布也显示出熔凝层的大概层深。结果表明,熔凝层的硬度相对于基体来说有很大的提高。在同样的等离子束工艺参数的条件下,灰铸铁的熔凝层深小于球墨铸铁的熔凝层深,主要原因是灰铸铁的导热率大于球墨铸铁的导热率。
The gray cast iron and ductile iron were melted by plasma beam to investigate the influence of graphite shape in cast iron on the deep melting layer. After plasma beam fusion treatment, the morphology and microstructure of the fused layer were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The depth of the fused layer was measured on the SEM picture. The cross-section hardness distribution of the fused sample also shows the approximate depth of the fused layer. The results show that the hardness of the fused layer is greatly improved relative to the matrix. Under the same plasma beam process parameters, the gray cast iron has a lower fusion layer depth than the ductile cast iron. The main reason is that the thermal conductivity of gray cast iron is greater than that of ductile iron.