Inconel 625 fracture toughness

[kevlar49]

I am having difficulty finding the fracture toughness of Inconel 625 in the cold worked condition. Does anyone know a good resource?

 

[EdStainless]

Have you checked MMPDS?
Though off the top of my head I can't think of an AMS spec for cold worked 625.
What strength are you talking about?

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P.E. Metallurgy, Plymouth Tube

 

[kevlar49]

yes, I've tried. I coulnd' find a spec for cold worked 625 either. Yield and Ultimate tensile strength.

 

[Maui]

You may have to pull a tensile and simply measure those properties.

 

Go to Nickel Development Institute. Its a fabulous resource for all things nickel.
ASTM standards will at give you the minima for tensile properties (but not impact toughness).

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[MagBen]

All AMS 5599, 5666 and 5837, ASTM B446 only specify the anneal condition with a min tensile of 120ksi. However, since material is pretty ductile,cold worked condition is not very uncommon, especially for strip products. Mechanical properties heavily depend on how much cold work applied. Strength level can be over 230ksi if applying cold work up to 60%. when cold reduction reaches 90%, tensile can go over 300ksi when .

 

[EdStainless]

I used to use a lot of cold drawn 625 shafting.
As I recall (it has been 30 years ago) we used 200ksi min UTS.
At that strength we still had great ductility.
We picked that strength to optimize fatigue properties.

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P.E. Metallurgy, Plymouth Tube

 

[kevlar49]

I was able to obtain charpy data for cold worked inconel 625, but don't know of a good correlation from Charpy to Kic or Jic. Anyone have any suggestions? I know there is a correlation for steels, but I have nothing to say whether that is applicable.

 

[WKTaylor]

K'49

Assume You are talking about KIc - linear-elastic plane-strain fracture toughness [ASTM E399]?

KIc data...
At what temper condition? stress relieved?
At what operating temperature/environment?
What material form: sheet, plate, bar/rod, forging?

Per my 'old' ASMH 4117... for nickel alloy 625...

3.2.7.2 Fracture toughness. The plane strain fracture
toughness in 5 ksi hydrogen has been measured
as 54 and 60 ksi (in)1/2 based on compact
specimen tests on annealed bar (1 hr/
1800F, Fty=100 ksi) (Ref. 14).

Ref. 14.
Harris, J. A., Jr., and Van Wanderham, M. C.,
“Properties of Materials in High Pressure Hydrogen
at Cryogenic, Room and Elevated Temperatures,” P.
W. A. Report FR-4566, prepared for NASA George C.
Marshall Space Flight Center under Contract NAS8-
26191 (June 30, 1971).

Regards, Wil Taylor

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[kevlar49]

We have it in the annealed and then cold worked condition. I am only able to roughly estimate the % cold work based on the microhardness.