TTT diagrams can tell us what steel microstructures we will get. Pearlite, Bainite, Martensite, Spheroidite, or tempered Martensite. The diagrams can also tell us the amount of each constituent present.
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Came across this very interesting video by accident. Great explanation. I wanted to thank you for using celsius, it breaks my brain when Americans use fahrenheit in science/engineering fields.
@@TaylorSparks a while back I got myself into the lockpicking hobby. The picks (which are expensive for how tiny they are) fatigue over time then snap and/or bend. I was wondering if I could put the bent ones through a heat treatment and make them closer to new. Or could I undo some of the fatigue before they break. Because of how thin they are they quench instantly, I drunkenly tried doing it with a butane torch, quenched it but couldn't be arsed to anneal it. So of course it snapped immediately the first time I trick to pick a lock. Do you think there is an approach that would work? What sort of temperatures and timings should I be experimenting with? Cheers mate.
Actually, Pearlite and Bainite are very different in terms of microstructure. Pearlite has a alternate lamellar alpha-Ferrite and cementite structure which is not a mechanical mixture of both. But in Bainite, it is a mechanical mixture of alpha-ferrite and cementite instead of a lamellar structure. It’s like a colloidal solution of alpha-ferrite and cementite.
Super cleared explanation ! Mr Taylor, how do you really get the isothermal holds diagram to craft the TTT diagram for an specifict steel alloy by using the avrami´s equation? Is it get it by experimental methods? or is there some theorical method to predict them with regarding to ther alloying elements (wt%), Thank you!
@@zhengpakho technically no. martensite is a name for a structure in general and it can be found in different materials so its not specific to steel; austenite on the other hand is a specific name for a phase of steel. for steels: if you heat the material above Ac3 line(minimum point of Ac3 line being 723°C for eutektoid steels(eutectoid steel= iron with 0.8w% C)) you go into austenite phase but remember that its only stable above this temperature. so if you want to have austenite steel in room temperature its a bit more complex but can be achieved by using austenite-phase-stabilizers and specific heat treating
