在稀土镁球墨铸铁生产中,灰斑是以珠光体为基体的稀土镁球铁中常见的缺陷之一。虽然灰斑的形成原因各不相同,但就其实质而言,是石墨聚集,其周围的铁索体连成片。这些部位比珠光体的颜色为暗,看起来像灰斑。我厂生产的柴油机球铁铸件为珠光体基体的,在近二十年的生产过程中,发现灰斑缺陷大致可分为链状石墨灰斑、高稀土灰斑和豆粒状灰斑三大类。 In the production of rare earth magnesium nodular cast iron, gray spot is one of the common defects of rare earth magnesium ductile iron based on pearlite. Although the reasons for the formation of gray spots vary, but in essence, it is the accumulation of graphite, the surrounding body of the ferrite even into a film. These parts are darker than pearlite and look like gray spots. I produced the diesel engine ductile iron substrate for the pearlite body, in the past 20 years in the production process, found that gray-spot defects can be divided into chain-like graphite gray spots, gray pea and high-grade gray spot gray three categories .