Impact deformation behavior of duplex and superaustenitic stainless steels welds by split hopkinson pressure bar

Shing Hoa Wang, Chih Sheng Huang, Woei Shyan Lee, Tao Hsing Chen, Chia Chang Wu, Charles Lien, Hung Yin Tsai

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

A considerable volume of γ phase increases in the fusion zone (weld metal) for two duplex stainless steels after a high-strain-rate impact. The strain-induced γ phase formation in the fusion zone results in local hardness variation depending on the strain rate. The α phase content in the fusion zone decreases as the impact strain rate increases for SAF 2205 DSS and SAF 2507 DSS. The results of the two-phase content measured by Ferritoscope correspond to that assessed by image analyses. In contrast, superaustenite stainless steel is unaffected by such an impact owing to its fully stable austenization. Impacted welds at a high strain rate of 5 × 10 3s-1 reveal feather-like surface creases along the solidified curved columnar grain boundaries. The apparent surface creases are formed due to the presence of diffuse Lüders bands, which are caused by heavy plastic deformation in coarse-grain materials.

Original languageEnglish
Pages (from-to)1007-1015
Number of pages9
JournalMetals and Materials International
Volume15
Issue number6
DOIs
Publication statusPublished - 2009 Dec 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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