Investigation of microstructure, mechanical, and corrosion behavior of nickel-based alloy 625/duplex stainless steel UNS S32205 dissimilar weldments using ERNiCrMo-3 filler metal

Tumer M., Mert T., Karahan T.

WELDING IN THE WORLD, cilt.65, ss.171-182, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 65
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1007/s40194-020-01011-0
  • Dergi Adı: WELDING IN THE WORLD
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex
  • Sayfa Sayıları: ss.171-182
  • Anahtar Kelimeler: Nickel alloy, Duplex stainless steel, MIG welding, ERNiCrMo-3 wire, Microstructural characterization, Corrosion, INCONEL 625, INCOLOY 825, WELD, RESISTANCE, WELDABILITY, TOUGHNESS, JOINT, TEMPERATURE, EVOLUTION
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

In this study, nickel-based alloy 625 and duplex stainless steel (DSS) UNS S32205 (2205) dissimilar pairs were welded with metal inert gas (MIG) welding process. Weld metal, obtained with the utilization of ERNiCrMo-3 filler wire, was subjected to mechanical, microstructural, and corrosion investigations. V-notch impact tests and micro hardness measurements were realized on dissimilar weld metal. Microstructural changes in weld metal, fusion line, and heat-affected zone were examined using optical, scanning (SEM), and transmission electron microscopes (TEM) with energy-dispersive spectrometry (EDS). Phase precipitations rich of Nb and Mo were detected among dendritic austenite arms in the weld metal. It was observed that ERNiCrMo-3 filler metal had sufficient toughness because of high nickel content. Corrosion tests revealed that weld metal face pass is the least corrosion-resistant zone in weld metal unlike weld root. This is mainly because more intense intermetallics formed in weld metal face compared with the middle of the weld and the root.