Quantifying the effects of tempering on individual phase properties of DP980 steel with nanoindentation

G. Cheng, F. Zhang, Annie Ruimi, D. P. Field, X. Sun

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Tempering treatment is conducted on a commercial dual phase (DP) 980 steel at 250 °C and 400 °C for 60 min each. Ferrite and martensite grains are distinguished using electron backscatter diffraction (EBSD) and scanning probe microscopy (SPM), and the martensite volume fractions (MVF) are determined based on the image quality (IQ) map. Indentation tests combined with a newly developed inverse method are used to obtain the individual phase flow properties in each sample. The results show that, i) tempering significantly reduces martensite yield strength, while it slightly reduces the ferrite yield strength; ii) tempering temperature has a more significant influence on the work hardening exponent of ferrite than that of martensite. As a validation, a simple rule-of-mixtures is used to verify the above-predicted individual phase flow stresses with the experimentally obtained overall true stress vs. true strain curves.

Original languageEnglish
Pages (from-to)240-249
Number of pages10
JournalMaterials Science and Engineering A
Volume667
DOIs
Publication statusPublished - 14 Jun 2016
Externally publishedYes

Fingerprint

tempering
Steel
Tempering
Nanoindentation
nanoindentation
martensite
Martensite
steels
Ferrite
ferrites
yield strength
Yield stress
Scanning probe microscopy
work hardening
Plastic flow
indentation
Indentation
Strain hardening
Electron diffraction
Image quality

Keywords

  • DP steels
  • Nanoindentation
  • Plastic flow properties
  • Tempering

ASJC Scopus subject areas

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

Cite this

Quantifying the effects of tempering on individual phase properties of DP980 steel with nanoindentation. / Cheng, G.; Zhang, F.; Ruimi, Annie; Field, D. P.; Sun, X.

In: Materials Science and Engineering A, Vol. 667, 14.06.2016, p. 240-249.

Research output: Contribution to journalArticle

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