Prediction of bulk tensile behavior of dual phase stainless steels using constituent behavior from micropillar compression experiments

J. L. Stewart, L. Jiang, J. J. Williams, Nikhilesh Chawla

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Micropillar compression has become an attractive method to probe local mechanical behavior. While most micropillar compression work has focused on investigating size effects, we can also use this technique to obtain the constitutive behavior of microscopic phases and constituents. In this study, micropillars of ferrite and martensite were fabricated by focused ion beam (FIB) milling of dual phase precipitation hardened powder metallurgy (PM) stainless steels. Compression testing was conducted using a nanoindenter equipped with a flat punch indenter. The stress-strain curves of the individual microconstituents were obtained. Using a rule of mixtures approach in conjunction with porosity corrections, the mechanical properties of ferrite and martensite were combined to predict the tensile behavior of the bulk material, and reasonable agreement was found for the ultimate tensile strength.

Original languageEnglish (US)
Pages (from-to)220-227
Number of pages8
JournalMaterials Science and Engineering A
Volume534
DOIs
StatePublished - Feb 1 2012

Keywords

  • Micropillar compression
  • Nanoindentation
  • Powder metallurgy steel

ASJC Scopus subject areas

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

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