Abstract
Hydrogen trapping in three high-strength steels—AerMet 100 and AISI 4340 and H11—was studied using a potentiostatic pulse technique. Irreversible trapping constants (k) and hydrogen entry fluxes were determined for these alloys in 1mol/l acetic acid/1mol/l sodium acetate. The order of the k values for the three steels and two 18Ni maraging steels previously studied inversely parallels their threshold stress intensities for stress corrosion cracking (KISCC). Irreversible trapping in AerMet 100 varies with aging temperature and appears to depend on the type of carbide (Fe3C or M2C) present. For 4340 steel, k can be correlated with KISCC over a range of yield strengths. The change in k is consistent with a change in the principal type of irreversible trap from matrix boundaries to incoherent Fe3C. The principal irreversible traps in H11 at high yield strengths are thought to be similar to those in 4340 steel.
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