The effect of microstructure in the hydrogen embrittlement of a gas pipeline steel

Alp T., Dames T., Dogan B.

Journal of Materials Science, vol.22, no.6, pp.2105-2112, 1987 (Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 22 Issue: 6
  • Publication Date: 1987
  • Doi Number: 10.1007/bf01132946
  • Journal Name: Journal of Materials Science
  • Journal Indexes: Scopus
  • Page Numbers: pp.2105-2112
  • Istanbul Medipol University Affiliated: No


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. © 1987 Chapman and Hall Ltd.