Hydrogen cracking in gas tungsten arc welding of an AISI type 321 stainless steel

P. Rozenak, Ya Unigovski, R. Shneck

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The effects of in situ cathodic charging on the tensile properties and susceptibility to cracking of an AISI type 321 stainless steel, welded by the gas tungsten arc welding (GTAW) process, was studied by various treatments. Appearance of delta-ferrite phase in the as-welded steels in our tested conditions was observed with discontinuous grain boundaries (M23C6) and a dense distribution of metal carbides MC ((Ti, Nb)C), which precipitated in the matrix. Shielding gas rates changes the mechanical properties of the welds. Ultimate tensile strength and ductility are increases with the resistance to the environments related the increase of the supplied shielding inert gas rates. Charged specimens, caused mainly in decreases in the ductility of welded specimens. However, more severe decrease in ductility was obtained after post weld heat treatment (PWHT). The fracture of sensitized specimens was predominantly intergranular, whereas the as-welded specimens exhibited massive transgranular regions. Both types of specimen demonstrated narrow brittle zones at the sides of the fracture surface and ductile micro-void coalescences in the middle. Ferrite δ was form after welding with high density of dislocation structures and stacking faults formation and the thin stacking fault plates with ε-martensite phase were typically found in the austenitic matrix after the cathodical charging process.

Original languageEnglish
Title of host publicationEnergy Materials 2014, Conference Proceedings
PublisherJohn Wiley and Sons Inc.
Number of pages6
ISBN (Electronic)9781119027942
StatePublished - 1 Jan 2014
EventEnergy Materials 2014 - Xi'an Shaanxi Province, China
Duration: 4 Nov 20146 Nov 2014

Publication series

NameEnergy Materials 2014, Conference Proceedings


ConferenceEnergy Materials 2014
CityXi'an Shaanxi Province


  • Cathodical charging
  • Cracking
  • GTAW
  • Hydrogen embritllement
  • Stainless steel
  • Welding

ASJC Scopus subject areas

  • Materials Science (all)
  • Mechanics of Materials
  • Energy Engineering and Power Technology


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