Mechanical properties of austenitic stainless steel with high niobium contents

M. Okayasu, S. Wu, K. Noda, D. Y. Lin, S. M. Yang

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


To better understand the influence of the microstructural characteristics on the mechanical properties of Fe-Cr22-Ni25-Nbx austenitic stainless steel (ASS-Nbx), the mechanical properties were investigated. Nb addition was conducted with four different amounts: 0, 0.29, 0.58 and 0.86%. With the increasing Nb content, the mean grain size for the Fe-Cr-Ni-based alloys decreased, while the size of Nb precipitate increased. Owing to the different microstructural characteristics, their mechanical properties were altered. The highest tensile strength was obtained for ASS-Nb0.29 alloy. However, with the increasing Nb content in ASS-Nb0.29–0.86 alloys, the tensile strength decreases despite the grain refinement. The mechanical properties of the ASS-Nb alloys were influenced by the Nb precipitation hardening and the grain boundary cohesive strength, arising from the size of Nb precipitations.

Original languageEnglish
Pages (from-to)1-13
Number of pages13
JournalMaterials Science and Technology
Publication statusAccepted/In press - Jan 20 2016


  • Hall-Petch relationship
  • Mechanical property
  • Microstructure
  • Niobium
  • Stainless steel

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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