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Microstructures of Plain Carbon Steel

Plain carbon steels are generally defined as being those alloys of Iron and carbon which contain up to 2.0% carbon. The performance of steels depends on the properties associated with their microstructures i.e on the arrangements, volume fraction and morphologies of the various phase constituting a macroscopic section of steel.The strength of low carbon ferritic microstructure is very sensitive to grain size while that of largely pearlitic microstructures are sensitive to interlamellar spacing.The structures discussed are stable microstructures formed from air cooling from the austenite phase field in the Iron -carbon diagram.The amount of phase distribution is evaluated using the lever rule.For a hypoeutectoid steel the ferrite nucleates growing on austenite grains, with depletion of carbon into the austenite and once the composition of austenite reaches 0.8% the pearlite formation takes place.Similarly in the case of Hyper eutectoid steel discussed (1.2% carbon) the cementite is the proeutectoid phase which forms first along grain boundaries. This network of cementite makes the high carbon steel brittle. This will also be useful for students preparing for Gate exam and PSU's exam. If you like my video plz give a thumbs up...and subscribe to my channel. Use the comment section for clarifications and suggestions. Edited and Managed by J Maxwell Dominic . Email: [email protected]