The hardness and strength of martensite increases with increasing carbon content of the steel. The new structure is equivalent to a supersaturated solution of carbon in alpha iron (ferrite).Ĥ The hardness of martensite is a function of the carbon content of the steel. See Figure This transformation mechanism allows cooperative movement of atoms from one crystal structure to the other. The face-centered cubic crystal structure of austenite is transformed by shear into the body-centered tetragonal structure of martensite. Martensite is formed by a diffusionless, shear-type mechanism. 2 Cooling Rate and Hardenability of SteelsĬhapter 13 Cooling Rate and Hardenability of Steels Cooling Rate ģ The face-centered cubic crystal structure of austenite transforms by shear into the body-centered tetragonal cubic crystal structure of martensite.
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