Abstract
Hydrogen embrittlement (HE) tests were carried out on a carbon-manganese pipeline steel having a low sulphur content (<0.01%). It was shown that the susceptibility to HE increased as the microstructures changed from ferrite-pearlite to martensite. In the hydrogenated state the fracture surface of the ferrite-pearlite and ferrite-bainite specimens consisted of small cleavage regions surrounding non-metallic (oxide) inclusions; these were called rosettes and were a characteristic feature of the embrittled state. In hydrogenated martensitic specimens, failure was almost entirely intergranular along prior austenite grain boundaries and cracking of martensitic laths. In the martensitic specimens a relationship between inverse time to failure and prior austenite grain size was established.
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Alp, T., Dames, T.J. & Dogan, B. The effect of microstructure in the hydrogen embrittlement of a gas pipeline steel. J Mater Sci 22, 2105–2112 (1987). https://doi.org/10.1007/BF01132946
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DOI: https://doi.org/10.1007/BF01132946