现在采用在已知尺寸的显微视场内计算的铁素体点的方法,以测量灰铸铁内铁素体以及灰铸铁和韧性铁的其它显微组织。本文介绍所用设备和方法。多年来,Lynchburg铸造公司等单位生产的铸件都要求达到一定的布氏硬度。而且,在铸件精加工线以下,金属基体组织内的铁素体要小于15％。这种铸件必须软得易于加工, Now a method of calculating ferrite points in a microscopic field of known size is used to measure ferrite in gray iron and other microstructures of gray cast iron and ductile iron. This article describes the devices and methods used. Over the years, Lynchburg Casting and other units produced castings are required to achieve a certain degree of Brinell hardness. Moreover, below the casting finishing line, the ferrite in the matrix of the metal matrix is ​​less than 15%. This casting must be soft and easy to process,