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Using analogies, descriptions, illustrations and quotations from the works of famous metallurgical scientists, an attempt was done to link tetragonality, fragility, changes in the morphology of the martensite, destabilization of austenite carbon when % С > (~ 0,5 %) with intermediate phase ~ Fe42С (~ 0,5 % C). If % C > 0,5: martensite begins to change the morphology from dislocation to twin structure and become catastrophically fragile as well as becomes tetragonal without clasuse on smoothback during quench cooling; ferrite loses its ability to be widmanstatten and strengthen as a result of natural aging after subcritical quenching; the yield strength of ferrite-cementine mixture, regardless form of cementite, even begins to fall; the interval of martensite transformation starts to decrease, etc.

žurnal sibirskogo federalʹnogo universiteta. tehnika i tehnologii/žurnal sibirskogo federalʹnogo universiteta. seriâ: tehnika i tehnologii

Fragility, Tetragonality, Change the Morphology Martensite, Destabilization of Austenite with Carbon if it More than ~ 0,5 %, as a Result of the Presence of a Perceived Intermediate Phase ~ Fe42C