Evaluation of the matrix strength of Fe-0.4 wt% C tempered martensite using nanoindentation techniques

T. Ohmura, K. Tsuzaki, S. Matsuoka

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58 Citations (Scopus)


Nanoindentation techniques were applied to evaluate the matrix strength of the as-quenched and the tempered martensite of an Fe-0.4 wt% C binary alloy. The matrix strength was compared with the micro Vickers hardness HvThe nanohardness Hnof the matrix decreases with increasing tempering temperature, which is similar to the temper softening observed in the micro Vickers hardness. The ratio Hn/HVwhich corresponds to the contribution of the matrix strength to the macroscopic strength, increases markedly when the specimen is tempered at 450°C. This is due to a reduction in the grain size effect caused by the grain growth of the blocks that are analogous to the effective grain. The pop-in behaviour that appears in the specimens tempered at or above 550°C is due to the reduction in the dislocation density caused by recrystallization.

Original languageEnglish
Pages (from-to)1903-1910
Number of pages8
JournalPhilosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Issue number10
Publication statusPublished - Jul 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • General Materials Science
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)
  • Metals and Alloys


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