Effect of ammonia impurity on hydrogen embrittlement of scm440 low-alloy steel in hydrogen gas

Zhang Nan, Ryosuke Komoda, Kazuki Yamada, Cynthia A. Volkert, Lin Tian, Reiner Kirchheim, Petros Sofronis, S. Hosseinisarani Zahra, Mohsen Dadfarnia, Masanobu Kubota, Aleksandar Staykov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Ammonia (NH3) was added to hydrogen gas as an impurity, then hydrogen embrittlement (HE) of the SCM440 low-alloy steel was investigated by fracture toughness tests. NH3 showed inhibition of the HE when the loading rate was relatively high. However, the inhibitory effect decreased with the decrease in the loading rate, as well as with an increase in the gas pressure. It was found that NH3 acted as both an inhibitor of the HE and a cause of the HE depending on the loading rate and gas pressure.

Original languageEnglish (US)
Title of host publication30th International Ocean and Polar Engineering Conference
PublisherInternational Society of Offshore and Polar Engineers
Pages3030-3035
Number of pages6
ISBN (Electronic)9781880653845
StatePublished - 2020
Externally publishedYes
Event30th International Ocean and Polar Engineering Conference, ISOPE 2020 - Virtual, Online
Duration: Oct 11 2020Oct 16 2020

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
Volume2020-October
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792

Conference

Conference30th International Ocean and Polar Engineering Conference, ISOPE 2020
CityVirtual, Online
Period10/11/2010/16/20

Keywords

  • Ammonia
  • Fracture toughness
  • Hydrogen Embrittlement
  • Impurities
  • Low-alloy steel

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

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