The influence of alloying elements on the phase transition during heating

by:ChangZeng     2021-02-20
Alloying elements affect the rate of austenite formation and the size of austenite grains during heating. (1) Influence on the formation rate of austenite: Cr, Mo, W, V and other strong carbide forming elements have a high affinity for carbon, forming alloy carbides that are insoluble in austenite, which significantly slows down austenite Formation rate: Co, Ni and other non-carbide-forming elements increase the diffusion rate of carbon and accelerate the formation of austenite; alloy elements such as Al, Si, Mn have little effect on the formation rate of austenite. (2) Effect on austenite grain size: most alloying elements have the effect of preventing austenite grain growth, but the degree of influence is different. The elements that strongly hinder the growth of grains are: V, Ti, Nb, Zr, etc.; the elements that hinder the growth of grains are: W, Mn, Cr, etc.; the elements that have little effect on the growth of grains are: Si, Ni, Cu, etc.; elements that promote grain growth: Mn, P, etc.
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