铸铁中石墨的形状和分布对铸铁的性能有很大影响。由于石墨的脆性,在作金相抛光时常易于从金属基本中脱落。为了防止石墨脱落,如重复抛光和腐蚀或使用蜡研磨板,可获得能接受的结果,但是这些方法很费时间并对操作者在技术上的依赖性很大。下述操作方法可使铸铁中的石得到最大程度的保留。 The shape and distribution of graphite in cast iron have a great influence on the performance of cast iron. Due to the fragility of graphite, metallographic polishing is often easy to fall off from the basic metal. Acceptable results are obtained to prevent graphite from shedding, such as repeated polishing and erosion or using wax lapping plates, but these methods are time consuming and technically dependent on the operator. The following methods of operation can make the stone in cast iron to the maximum retention.