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Annealing over austenitized 440B

Annealing over austenitized 440B

Annealing over austenitized 440B

Would annealing and re-hardening 440B (0.9C) that was austenitized above 1950F not refine the coarse grained structure?
Train of thought is coarseness of the prior austenite grains and out of matrix carbides from the high austenitization and subsequent coarse martensitic structure would translate to fewer points of nucleation and thus less impingement during any recrystallizing cycle.

RE: Annealing over austenitized 440B

1900F would be a more typical aust temperature to quench from.
What anneal temp are you thinking of using?
Which grain size are you talking about?
The standard that gets reported is the 'prior austenite grain size', not to be confused with the finished grain size.

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P.E. Metallurgy, consulting work welcomed

RE: Annealing over austenitized 440B

Yes after annealing, would re-austenitize at ~1900F.
For annealing:
Ideally, would equalize ~1300F (process anneal temp.) + Full anneal ~1560F
Economically, would process anneal >1400F

My main concern is the final grain structure not recovering enough from the anneal + re-austenitize, resulting in subpar final yield and impact properties.

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