Evaluation of grain boundary effect on strength of Fe-C low alloy martensitic steels by nanoindentation technique

Jinxu Li, Takahito Ohmura, Kaneaki Tsuzaki

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The grain boundary effect on the strength was evaluated through nanoindentation technique for Fe-0.4C-Cr-Mo steels that were produced by the ausform-tempered (AF) and conventional quench-tempered (QT) processes. A semiquantitative Hall-Petch plot was made to determine the locking parameter k for the two alloys using nanohardness, micro-Vickers hardness, and grain size. The k value for the QT sample is significantly larger than that for the AF sample and is attributed to the film-like carbides on the grain boundaries of the QT sample. The lower k value of the AF sample is one of the factors for the improved delayed fracture property in the AF compared to that of the QT sample.

Original languageEnglish
Pages (from-to)1301-1305
Number of pages5
JournalMaterials Transactions
Volume46
Issue number6
DOIs
Publication statusPublished - Jun 1 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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