Abstract
Thermal desorption spectroscopy (TDS) and sustained-load tests were used to investigate hydrogen embrittlement (HE), hydrogen profiles and the impact of the baking delay of cadmium-plated 4340 steel-notched bars. The results show a tremendous concentration of hydrogen in the cadmium coatings (200 to 1500 ppma) that does not contribute to HE. Hydrogen in manganese sulfide (MnS) traps was also found not to contribute to HE. The total hydrogen concentration measured by TDS is thus not suitable to determine an embrittlement threshold. Subtracting hydrogen in cadmium and MnS traps from total hydrogen allowed finding a true critical hydrogen concentration threshold of 0.6 ppma (0.01 ppmm). No impact of the baking delay was found.
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