Mechanical performance of 22SiMn2TiB steel welded with low-transformation-temperature filler wire and stainless steel filler wire

Zi dong Lin, Kai jie Song, Zhen Sun, Zi qian Zhu, Xue feng Zhao, Constantinos Goulas, Wei Ya, Xing hua Yu*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

TX-80 low-transformation-temperature (LTT) welding wire was used to replace the traditional ER 307Si welding wire to realize the connection of 22SiMn2TiB armor steel in manual overlay welding. The previously existing issues, such as welding cracks, large welding deformation, and severe welding residual stress, were solved to ensure good strength and ductility requirements. In particular, with the same welding conditions, TX-80 LTT wire eliminates welding cracks. It reduces the welding deformation no matter the base pretreatment of pre-setting angle or no pre-setting angle. By comparison, it was found that the microstructure at the TX-80 weld is mainly composed of martensite and a small amount of retained austenite. In contrast, the microstructure of the ER 307Si weld consists of a large amount of austenite and a small amount of skeleton-like ferrite. The variation trend of residual stress and microhardness from the weld to the base were investigated and compared with the mechanical properties of base materials. The TX-80 and the ER 307Si tensile samples elongation is 6.76% and 6.01%, while the ultimate tensile strengths are 877 and 667 MPa, respectively. The average impact toughness at room temperature of the ER 307Si weld is 143.9 J/cm2, much higher than that of the TX-80 weld, which is only 36.7 J/cm2. The relationship between impact and tensile properties with microstructure species and distribution was established. In addition, the fracture surface of the tensile and the impact samples was observed and analyzed. Deeper dimples, fewer pores, larger radiation zone, and shear lips of TX-80 samples indicate better tensile ductility and worse impact toughness than those of ER 307Si weld.

Original languageEnglish
Pages (from-to)967-981
Number of pages15
JournalJournal of Iron and Steel Research International
Volume31
Issue number4
Early online date30 Oct 2023
DOIs
Publication statusPublished - Apr 2024

Keywords

  • 2024 OA procedure
  • Low-transformation-temperature material
  • Martensitic transformation
  • Mechanical property
  • Residual stress
  • Welding deformation
  • 22SiMn2TiB steel

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