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Nil Ductility Temperature or Ductil to Brittle Transition Temperature

Nil Ductility Temperature or Ductil to Brittle Transition Temperature

Nil Ductility Temperature or Ductil to Brittle Transition Temperature

(OP)
Does anyone know where I can locate the NDTT or DBTT (Nil ductility or ductil to brittle transition temps) for 174-h900?

Thanks

RE: Nil Ductility Temperature or Ductil to Brittle Transition Temperature

(OP)
I meant to write 17-4 h900, instead of 174-h900.  Sorry for the mix up.

RE: Nil Ductility Temperature or Ductil to Brittle Transition Temperature

I couldn’t locate specific impact energy data below room temperature in the literature I have for 17-4PH in this heat treatment condition. At room temperature, the value reported is about 20 ft-lbs minimum CVN impact energy at the 900 heat treatment condition*. Below room temperature, the impact energy for this heat treatment condition is going to decrease in value so if there is a so-called DBTT it might be above RT, if you can find CVN data at elevated temperature.

*Source; "Handbook of Stainless Steels" by Peckner and Bernstein

RE: Nil Ductility Temperature or Ductil to Brittle Transition Temperature

Cartech data
H900 RT CVN 16 ft-lb typical

But, in another table for H925
75F  30 ft-lb
10F  16 ft-lb
-40F  9 ft-lb

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
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RE: Nil Ductility Temperature or Ductil to Brittle Transition Temperature

(OP)
Many thanks.  This is exactly the info I've been looking for.

RE: Nil Ductility Temperature or Ductil to Brittle Transition Temperature

From Armco 17-4PH

H900 CVN Ft-lb
75F 19 ft-lb
32F 18-20 ft-lb
-40F 7-9 ft-lb
-80F 8 ft-lb
-320F 3-4.5 ft-lb


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