Strengthening Hadfield steel welds by nitrogen alloying

C. Efstathiou, H. Sehitoglu

Research output: Contribution to journalArticlepeer-review


Strengthening Hadfield steel weld repairs by introducing nitrogen into the weld region was proven to be feasible via two welding techniques. The first technique required a pure Hadfield steel filler material to be diffusion treated in a high pressure nitrogen gas environment, and subsequently used during tungsten inert gas welding with a pure argon shielding gas. The second technique used a Hadfield steel filler material, and a 10% nitrogen containing argon shielding gas during tungsten inert gas welding. Both techniques increased the yield strength, the hardening rate, and the ultimate strength of the weld region. Using optical microscopy, scanning electron microscopy, and Auger spectroscopy, we determined that the increased strength of the weld region resulted from a combination of nitrogen alloying and microstructural refinement.

Original languageEnglish (US)
Pages (from-to)174-179
Number of pages6
JournalMaterials Science and Engineering A
Issue number1-2
StatePublished - Apr 25 2009


  • Austenite
  • Hadfield steel
  • Nitrides
  • Nitrogen alloying
  • Welding

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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