Effects Of Phase Changes On Heating And Cooling G43400 Steel - China

The main solid-state phase transformation of G43400 steel during heating is the transformation from non-austenite phase to austenite phase, i.e. the process of austenitization.

The whole process is related to the diffusion of carbon.

Among the alloying elements, non-carbide-forming elements reduce the activation energy of carbon in austenite and increase the speed of austenite formation; while strong carbide-forming elements strongly hinder the diffusion of carbon in steel and slow down the process of austenitization.

The phase transformation of G43400 steel during cooling refers to the decomposition of supercooled austenite, including pearlite transformation (eutectoid decomposition), bainite phase transformation and martensite phase transformation.

Taking the influence of alloying elements on the isothermal transformation curve of supercooled austenite as an example, most alloying elements, except cobalt and aluminum, play a role in slowing down the isothermal decomposition of austenite, but the role played by each element is different.

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