Explanation

(See eutectoid reaction) The eutectoid transformation of undercooled austenite in steel occurs when it is close to equilibrium, that is, the degree of under cooling is not large. The product is composed of ferrite and carburizing, usually in lamellar structure, called pearlite. Pearlescent transformation is one of the basic types of phase and structure transformation during metal heat treatment. The thickness and integrity of the product layer depend on the degree of under cooling (the difference between the transformation temperature and the equilibrium eutectoid transformation temperature), and under the condition of continuous cooling, it depends on the cooling rate; The lamellar spacing is determined by the degree of under cooling. This type of eutectoid product (broadly defined as pearlite) can be divided into three types based on dispersion: (narrowly defined) pearlite, sorbite, and troostite.

Classification