4340 phase diagram

[Julien88]

Hi,
I'm doing heat treatments on a 4340 steel which is a nickel-chromium-molybdenum steel containing also manganese and carbon. Anyone knows which and how I can find the appropriate phase diagram for this low-alloy steel?
thank you!

 

[TVP]

Are you looking for a TTT diagram (time-temperature-transformation) or a CCT (continuous cooling transformation) diagram, which relates the microstructures developed during thermal processing to the process temperature? An example is shown in the link below:

http://www.msm.cam.ac.uk/phase-trans/2000/practicals/AP3/Image5.gif

If you just need the basics of liquidus temperature, etc. then the Fe-C phase diagram should be sufficient:

http://www.calphad.com/graphs/Metastable Fe-C Phase Diagram.gif