Metal Dusting versus Carburization

[arcpro]

How can we differentiate between carburization and metal dusting?
I know the basics of both but how we can actually compare and draw lines between the two?

[mechcolor]

In very simple words, the corrosion (metal loss) resulting from carburization process is metal dusting. This only happens when metastable carbides are formed and then disintegrate in the form of dust.

[octane]

How can one estimate the carbon activity to determine the possibility of metal dusting?