在球墨铸铁活塞环筒体、双环铸造中,其铸态显微组织常出现环的内外圈部位石墨球细小、量多,铁素体较多,而环的中心部位石墨球粗大、量少,且沿共晶团晶界有针状、块状渗碳体和莱氏体混合物,也就是我们常说的反白口。反白口是球墨铸铁活塞环生产中常见的一种缺 In the ductile iron piston ring cylinder, double ring casting, the as-cast microstructure often appear ring inner and outer ring parts of the graphite ball is small, more volume, more ferrite, and the center of the ring graphite ball thick, less, And along the eutectic grain boundaries have acicular, massive cementite and ledeburite mixture, which is what we often say anti-white. Anti-white nodular cast iron piston ring is a common lack of production