Are Hydrogen Embrittlement Fractures Always Intergranular?
Are Hydrogen Embrittlement Fractures Always Intergranular?
(OP)
I came across a claim during literature review for a failure that "HE failures are ALWAYS intergranular". I want to know what you think.
Specifics to the situation I am working with: I have fractured CrMoV high-strength martensitic steel fasteners that exhibit quasi-cleavage fracture. Can this morphology form under hydrogen damage?
Specifics to the situation I am working with: I have fractured CrMoV high-strength martensitic steel fasteners that exhibit quasi-cleavage fracture. Can this morphology form under hydrogen damage?
RE: Are Hydrogen Embrittlement Fractures Always Intergranular?
With untempered martensite it can be pretty hard to tell by optical metallography. In the practical business of failure analysis I don't think this level of science is essential.
If factors required for EAC are all present - tensile stress, susceptible material, and environment (bad actor + temperature) then it is safe to presume HE mechanism, if other possible mechanisms have been eliminated from consideration.
Certainly 'CrMoV high-strength martensitic steel' and 'fasteners' are among the usual suspects...
"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
RE: Are Hydrogen Embrittlement Fractures Always Intergranular?
RE: Are Hydrogen Embrittlement Fractures Always Intergranular?
You see this is SS with CSCC, mixed mode is very common.
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P.E. Metallurgy, consulting work welcomed
RE: Are Hydrogen Embrittlement Fractures Always Intergranular?