Microscale deformation of a tempered martensite ferritic steel: Modelling and experimental study of grain and sub-grain interactions

Brian J. Golden, Dong Feng Li, Yina Guo, Peter Tiernan, Sean B. Leen, Noel P. O'Dowd

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, a finite-element modelling framework is presented with explicit representation of polycrystalline microstructure for a tempered martensite ferritic steel. A miniature notched specimen was manufactured from P91 steel with a 20,000 h service history and tested at room temperature under three point bending. Deformation at the microscale is quantified by electron back scattered diffraction (EBSD) before and after mechanical loading. A representative volume element was developed, based on the initial EBSD scan, and a crystal plasticity model used to account for slip-based inelastic deformation in the material. The model showed excellent correlation with the experimental data when the relevant comparisons were made.

Original languageEnglish
Pages (from-to)42-52
Number of pages11
JournalJournal of the Mechanics and Physics of Solids
Volume86
DOIs
Publication statusPublished - 1 Jan 2016

Keywords

  • Mesoscale modelling
  • Strain gradient crystal plasticity
  • Tempered martensitic steels

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