Abstract
Pearlitic microstructure can be obtained when austenite of eutectoid composition is slowly cooled from high temperature to below the Ae3 temperature. It is also possible to induce such structure in hypo-eutectoid composition of austenite through proper heat treatment as well. However, in the current work, one hypo-eutectoid steel during very slow cooling only produced completely pearlitic microstructure which was not expected from a steel with such composition. The calculations carried out considering orthoequilibrium condition actually predicted the presence of about 37% ferrite in the microstructure. Further calculations considering different equilibrium modes and kinetics of transformation indicates that the composition and thermal condition of the steel under consideration was such that proeutectoid ferrite formation could not start before the composition reaches to the Negligible Partitioning Local Equilibrium phase boundary which further coincides with the area described by Hultgren extrapolation and thus, the steel completely transforms to pearlite even with hypo-eutectoid composition during very slow cooling.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
