Grain Boundary Carbide Network In725
Grain Boundary Carbide Network In725
(OP)
I have a section of In725 that appears to have a nearly continuous carbide network at the grain boundaries.
Is this typical for this grade?
Heat treatment was:-
1040c for 11hr/air cool
730c for 12hr/furnace cool to 620c hold for 8hr/air cool
Hardness 37HRC
Thanks in advance.
Is this typical for this grade?
Heat treatment was:-
1040c for 11hr/air cool
730c for 12hr/furnace cool to 620c hold for 8hr/air cool
Hardness 37HRC
Thanks in advance.





RE: Grain Boundary Carbide Network In725
MICROSTRUCTURES AND THE STRUCTURE STABILITY OF INCONEL 725,A NEW AGE—HARDENABLE CORROSION RESISTANT SUPERALLOY
J.X.Dong[1], M.C.Zhang[1], S.K.Mannan[2]
RE: Grain Boundary Carbide Network In725
First of all you need a way to know if they are carbides or some other phase.
And then you need to look at samples prior to HT.
And then you can identify what it really is, and decide if it matters (properties, corrosion resistance).
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Plymouth Tube
RE: Grain Boundary Carbide Network In725
RE: Grain Boundary Carbide Network In725
RE: Grain Boundary Carbide Network In725
RE: Grain Boundary Carbide Network In725
Annealing cycle :
1040C for 11 hrs à it will produce Eta phase and if its very long exposure time then sigma phase formation will happen, however with in 11hrs it will not form sigma phase.
Each annealing cycle has its own impact on mechanical properties.
Aging cycle for 20 Hrs:
1. 730C for 12 Hrs à M23C6/ M6C formation in grain boundary with gamma prime & double prime phase in the matrix.
2. 620C for 8 Hrs à hold inside the furnace to complete the total 20 Hrs cycle.
Checking:
If you want to check it then you can use SEM/EDX analysis for chemical composition checking.
Please refer the paper below
http://www.tms.org/superalloys/10.7449/2001/01-510...
RE: Grain Boundary Carbide Network In725
What about properties? Does the material have the ductility that it should?
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Plymouth Tube
RE: Grain Boundary Carbide Network In725
RE: Grain Boundary Carbide Network In725
RE: Grain Boundary Carbide Network In725
What is the etch?
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Plymouth Tube
RE: Grain Boundary Carbide Network In725
Tried gleyceriga and mixed axids.
RE: Grain Boundary Carbide Network In725