Abstract
The quenching process of 20 steel and 45steel is investigated in the paper and the changing law of martensite in carbon steel is discussed. The carbon content in 20steel and 45steel is both less than 0.77%,which means they are hypoeutectoid steel. The microstructure of 20 steel after quench shows lath shape while martensite in that of 45steel exhibits both lath shape and flake which occupies approximately 80%. The plasticity and toughness of martensite depend on the substructure, that is, the toughness of dislocation martensite is better than that of twin martensite under the same condition.
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