Effects of dynamic impact on mechanical properties and microstructure of special stainless steel weldments

Wuan Yun Hsiao, Shing Hoa Wang, Chih Yuan Chen, Jer Ren Yang, Woei-Shyan Lee

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Variations in weld metal microstructure after impact at different strain rates for three weld metals, SAF 2507 DSS, SAF 2205 DSS and 254 SMO steel, are addressed. The twin grain forms that appear inside the γ grain of duplex stainless steel at low impact strain rates may be caused by adiabatic heat. The needle-like or thick streak-like twins occur in the γ grain of duplex stainless steel, caused by shear stress at a high strain rate. The impact induces dislocation loop formation in the γ phase of 254 SMO steel at low strain rate, but martensite is produced at a high strain rate. The chemical composition affects the stacking fault energy coupled with adiabatic heat to determine the final structure of the impact.

Original languageEnglish
Pages (from-to)172-179
Number of pages8
JournalMaterials Chemistry and Physics
Volume111
Issue number1
DOIs
Publication statusPublished - 2008 Sep 15

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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