[fire_eye]

Where's the Martensite in your diagram?

I know it has to be there, because I had to drill some out of a broken-off stud in an exhaust manifold with a carbide cutter today...

[E Rocc]

Where's the Martensite in your diagram?

I know it has to be there, because I had to drill some out of a broken-off stud in an exhaust manifold with a carbide cutter today...

If I remember right, martensite forms as a result of rapid cooling, and doesn't appear on the "steady state" iron-carbon phase diagram.

-Eric