Paper Title:
Effect of Inhomogeneity of Carbide Precipitation on Nanohardness Distribution for Martensitic Steels
  Abstract

Nanoindentation technique was applied to evaluate nanohardness distribution in a submicron scale for two kinds of martensitic steels: Fe-0.4C binary steel and Fe-0.05C-0.22Ti steel with a stoichiometric composition of TiC. AFM images showed that Fe-C steel includes relatively coarse cementite particles with about 100~200 nm in diameter and a couple of hundreds nanometer in average spacing, while high-resolution TEM observation showed that the Fe-C-Ti steel has fine TiC precipitates with 5 nm in diameter and 15 nm for average spacing. Nanoindentation results revealed that the standard deviation was much higher for the Fe-C than that for the Fe-C-Ti. Since the typical indent size was a couple of hundreds nanometer, which was about two orders larger than the size of the TiC and comparable to the cementite size, the small distribution of nanohardness of the Fe-C-Ti was attributed to the homogeneous microstructure in sub-micron scale, while the inhomogeneity of cementite particles in the Fe-C steel leaded to large nanohardness.

  Info
Periodical
Materials Science Forum (Volumes 475-479)
Main Theme
Edited by
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie
Pages
4109-4112
DOI
10.4028/www.scientific.net/MSF.475-479.4109
Citation
J. X. Li, T. Ohmura, F. G. Wei, K. Tsuzaki, "Effect of Inhomogeneity of Carbide Precipitation on Nanohardness Distribution for Martensitic Steels", Materials Science Forum, Vols. 475-479, pp. 4109-4112, 2005
Online since
January 2005
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$35.00
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