CU5MCuC tensile & eleongation failure..
CU5MCuC tensile & eleongation failure..
(OP)
Inconel 825 (CU5MCuC), tensile & elongation is getting failed after solution annealing & stabilizing treatment. I have tried with only solution annealing treatment but that too getting failed but as per standard A494 we have to do solution annealing & stabilizing. The fracture surface doesnt look like cup and cone fracture.
Kindly help me to come out from this.
Kindly help me to come out from this.





RE: CU5MCuC tensile & eleongation failure..
Are you getting good enough homogenization?
You need to do some micros and look carefully at grain boundaries.
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Plymouth Tube
RE: CU5MCuC tensile & eleongation failure..
RE: CU5MCuC tensile & eleongation failure..
RE: CU5MCuC tensile & eleongation failure..
RE: CU5MCuC tensile & eleongation failure..
RE: CU5MCuC tensile & eleongation failure..
RE: CU5MCuC tensile & eleongation failure..
What anneal did you use?
I don't see grain boundaries (etch more?).
But I see a lot of trash, that didn't go into solution in anneal.
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Plymouth Tube
RE: CU5MCuC tensile & eleongation failure..
Solution anneal is called for, although chemistry should probably be verified first.
"If you don't have time to do the job right the first time, when are you going to find time to repair it?"
RE: CU5MCuC tensile & eleongation failure..
C: 0.021%
Mn: 0.75%
Si: 0.79%
P: 0.017%
S: 0.002%
Cu: 1.82%
Ni: 39.51%
Cr: 19.9%
Mo: 2.86%
Nb: 0.801%
V: 0.037%
W: 0.104%
Fe: 32.90%
Co: 0.401%
RE: CU5MCuC tensile & eleongation failure..
RE: CU5MCuC tensile & eleongation failure..
Looking at the micro I see a haze along the grain boundaries, this is not good.
This is a stabilized alloy, so there should be a uniform distribution of NbCN particles throughout the structure.
It looks like a secondary phase formed on solidification (perhaps a W rich one) that you didn't dissolve in the anneal.
Try to reanneal a sample. Use 100F hotter ( at least 2100F) for 6 hours and water quench. You should be able to get a better microstructure.
Materials Scientists think that microstructure determines properties, Materials Engineers know that defects determine properties.
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Plymouth Tube
RE: CU5MCuC tensile & eleongation failure..
Is there anything I can do with heat treatment to modify the mechanical properties.