Microstructural and mechanical properties of dual-phase steels welded using GMAW with solid and flux-cored welding wires


HAYAT F. , Uzun H.

INTERNATIONAL JOURNAL OF MATERIALS RESEARCH, cilt.103, ss.828-837, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 103 Konu: 7
  • Basım Tarihi: 2012
  • Doi Numarası: 10.3139/146.110702
  • Dergi Adı: INTERNATIONAL JOURNAL OF MATERIALS RESEARCH
  • Sayfa Sayıları: ss.828-837

Özet

The aim of this study is to demonstrate the transformation of grade-A steel into dual-phase steel by heat treatment, and the joint performance of dual-phase steels welded by means of the gas metal arc welding process using both solid and flux-cored welding wires. Dual-phase steels with different contents of martensite were obtained by intercritical annealing in different temperature ranges of a grade-A shipbuilding steel, followed by water quenching. The experimental results revealed that the tensile strength of the dual-phase steels joined by solid wire is higher than that of the flux-cored wire joints. The microstructure of grade-A steel consists of ferrite and pearlite, while the dual-phase steels consist of ferrite and martensite. On the other hand, while the martensitic phase is especially encountered in the weld metal of the dual-phase steels joined with the solid wire, the ferrite phase is more common in the weld metal of the flux-cored wire joints.