正火或退火状态的高碳钢或中碳钢组织,在晶界上,中碳钢为铁素体,高碳钢则为渗碳体,但由于两者在显微镜下均呈白色,因此在鉴别时往往带来困难,为便于判别,现介绍如下几种区别方法: 1.在100倍放大下晶界上铁素体分布较粗大肥胖,且弯曲;渗碳体则细小,有轮廓,分布较直。在500倍下,晶界上的白色相若与基本珠光体中的铁素体连在一起者为铁素体;如果白色相与基体珠 Normal or annealed high carbon steel or medium carbon steel, in the grain boundary, the carbon steel is ferrite, high carbon steel is cementite, but because both under the microscope were white, so in the Identification is often difficult, for the convenience of discrimination, are presented below several different methods: 1. In the 100 times magnified lower grain boundary ferrite distribution fat, and bending; cementite is small, profile, distribution Straight. At 500 times, the white on the grain boundaries is similar to the ferrite in the basic pearlite. If the white phase and the matrix beads