激冷试验是评价铸铁石墨化倾向的一种方法。当铸铁迅速凝固或通过快速冷却被故意激冷时就形成白口而成为硬的白口铸铁。铸件截面中形成的白口数取决于铸件截面尺寸、铸铁化学成分和生产因素,如孕育工艺和过热程度。用于测定特定铸铁中白口数的激冷试样,也可用 Chilling test is to evaluate the tendency of cast iron graphitization. When the cast iron rapidly solidified or chilled by deliberately chilled to form a white mouth and become a hard white cast iron. The number of white threads formed in the cross section of the casting depends on the size of the cross section of the casting, the chemical composition of the cast iron and the factors of production such as the inoculation process and the degree of overheating. Chilled specimens for the determination of the number of white teeth in a particular cast iron may also be used