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

T. Ohmura, Kaneaki Tsuzaki, S. Matsuoka

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Abstract

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
Volume82
Issue number10
DOIs
Publication statusPublished - Jan 1 2002

Fingerprint

Vickers hardness
Nanoindentation
nanoindentation
martensite
Martensite
Nanohardness
evaluation
Binary alloys
Tempering
matrices
Dislocations (crystals)
Grain growth
Crystallization
tempering
binary alloys
softening
grain size
Temperature
temperature

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "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.",
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AU - Tsuzaki, Kaneaki

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