Growth rate of copper sulfide precipitates in solid low carbon steel

Kentaro Urata, Yoshinao Kobayashi, Rie Endo, Masahiro Susa, Woo Yeol Cha

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The kinetics of copper sulfide growth has been investigated using low carbon steel samples such as Fe-0.3mass%Cu-0.03mass%S-0.1mass%C and Fe-0.1mass%Cu-0.01 mass%S-0.1mass%C. The samples were heat-treated at 1 273, 1 423 and 1 573 K for 100 s - 14.4 ks for precipitation of copper sulfides and then subjected to observation by a scanning electron microscope (SEM) and a transmission electron microscope (TEM) to measure the size of copper sulfides precipitated in the samples. The growth kinetics of copper sulfides has been found to be well described by the Ostwald ripening model, as follows: Rt3-R03= (k0/T)t where Rt and R0 are the radii of copper sulfide precipitates, respectively, at t = t and t = 0 where t is time, kO is the rate constant in this model and T is thermodynamic temperature. The diffusion coefficients and activation energy derived from values of kO are close to those of copper in austenitic iron. On the basis of the growth kinetics, it has been proposed that the heat-treatment for as-cast strip steel should be conducted at around 1 273 K, at which the size of copper sulfide precipitates can be controlled to be as small as 20-30 nm in several tens of minutes.

Original languageEnglish
Pages (from-to)103-108
Number of pages6
JournalISIJ International
Issue number1
Publication statusPublished - 2015
Externally publishedYes


  • Copper sulfide
  • Impurity
  • Low carbon steel
  • Precipitation
  • Strip casting

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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