Cu precipitation kinetics during martensite tempering in a medium C steel

Jae Gil Jung, Minsu Jung, Sang Min Lee, Eunjoo Shin, Han Chul Shin, Young Kook Lee

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24 Citations (Scopus)

Abstract

The Cu precipitation kinetics during martensite tempering of an Fe-0.44C-0.60Mn-0.21Si-0.11Cr-1.53Cu (wt.%) steel was quantitatively investigated by separating the Cu precipitation from the cementite precipitation through electrical resistivity, small-angle neutron scattering (SANS), dilatometry, and thermodynamic calculations. The cementite precipitation was already finished during continuous heating to 450 °C, and then Cu precipitation occurred above 450 °C. The Cu precipitation kinetics was accelerated with increasing tempering temperature. The fcc ε-Cu particles were precipitated mainly at cementite interfaces, while bcc Cu-rich particles were formed in the tempered martensite matrix, and transformed to 9R, 3R, and fcc ε-Cu during further tempering, resulting in higher hardness of a medium C steel. The activation energy for isothermal Cu precipitation (64.9 ± 13.3 kJ/mol) during martensite tempering of the present medium C steel was even lower than that of a low C steel due to the greater cementite fraction.

Original languageEnglish
Pages (from-to)299-307
Number of pages9
JournalJournal of Alloys and Compounds
Volume553
DOIs
Publication statusPublished - 2013 Mar 15

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All Science Journal Classification (ASJC) codes

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

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