Abstract
Hydrogen embrittlement susceptibility, as measured from room temperature precharged tensile specimens, indicates that the type, extent, and morphology of carbide precipitation are all important in determining the degree and mode of degradation. At equivalent charging conditions, embrittlement is virtually eliminated by aging to produce fine scale clustering of Ti(C, N), even when concurrent with cementite precipitation. High temperature aging (> 500 °C) results in exclusive precipitation of the alloy carbide, but also in a total loss of ductility due to a fracture mode transition to intergranular. This is shown to be associated with metalloid (P, S) segregation to grain boundaries accompanying depletion of Ti in solution. Intermediate behavior is observed in microstructures produced by high temperature quenching or aging at temperatures (∼ 400 °C) where only cementite precipitation is observed.
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Stevens, M.F., Bernstein, I.M. The role of aging reactions in the hydrogen embrittlement susceptibility of an HSLA steel. Metall Trans A 16, 1879–1886 (1985). https://doi.org/10.1007/BF02670375
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DOI: https://doi.org/10.1007/BF02670375