Factors affecting the transformation rate of austenite

　　1, The effect of heating temperature

　　As the heating temperature increases, the nucleation rate, the growth rate, and the atomic diffusion capacity of austenite increase the formation rate of austenite.

　　2, The impact of heating speed

　　As the heating rate increases, the various stages of the austenite formation process move to a higher temperature range. The faster the heating rate, the greater the superheat of the pearlite, the shorter the incubation period of the transition, and the longer the time required for the transformation. short.

　　3. The influence of the chemical composition of steel

　　The effect of carbon content of steel

　　When the carbon content in the steel increases, the total interface of the ferrite and the cementite increases, and the carbon diffusion capacity increases. At the same time, the higher the carbon concentration in the austenite, the faster the diffusion rate of the atom, the austenite The greater the probability of nucleation of the body.

　　Effect of alloying elements in steel

　　The alloying elements in steel do not change the general course of austenitization during steel heating, but the alloying elements have a great influence on the nucleation, growth, dissolution of carbides, and austenite homogenization of austenite. .

　　4. The influence of the original structure of steel

　　The finer the original structure of the steel, the greater the dispersion of carbides, the smaller the interlamellar spacing of ferrite and cementite, and the more the phase interface, the faster the austenite formation.

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