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Metallurgical and Materials Transactions A

, Volume 44, Issue 8, pp 3882–3889 | Cite as

Defects in Carbon-Rich Ferrite of Cold-Drawn Pearlitic Steel Wires

  • Y. Z. ChenEmail author
  • G. Csiszár
  • J. Cizek
  • S. Westerkamp
  • C. Borchers
  • T. Ungár
  • S. Goto
  • F. Liu
  • R. Kirchheim
Article

Abstract

By means of X-ray line profile analysis and positron lifetime spectroscopy, densities of deformation-induced defects in carbon-rich ferrite of a series of cold-drawn pearlitic steel wires with true strains (ε) up to 5 are characterized. It is shown that both the dislocation densities and the vacancy cluster concentrations increase continuously with increasing ε. On the basis of the measured defect densities, values of defect hardening are estimated. The result shows that contributions of the defect hardening to the total tensile strength of the wires reach nearly 40 pct, which is mainly ascribed to the dislocation hardening. Chemical surroundings of the defects in the carbon-rich ferrite are investigated by coincidence Doppler broadening spectroscopy. The association of carbon with the defects in ferrite is demonstrated.

Keywords

Ferrite Cementite Positron Lifetime Vacancy Cluster Atom Probe Tomography 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors gratefully acknowledge the financial supports from the Deutsche Forschungsgemeinschaft (SFB 602 TP B13 and KI 230/34), the Alexander von Humboldt Stiftung, the Czech Science agency (project P108/12/G043), and thank Prof. D. Raabe, Dr. Y.J. Li, and Dr. P. Choi for fruitful discussions, as well as Dr. S. Nishida from Nippon Steel Company for providing the wire specimens. Y.Z.C. appreciates the supports from the Natural Science Foundation of China (Nos. 51101121 and 51125002), the Research Fund of the State Key Lab. of Solidification Processing (NWPU) (No. 79-TP-2011), and the Fundamental Research Fund of NWPU (No. JC2001134). G.Cs. and T.U. are grateful to the Hungarian National Science Foundation (OTKA #71594, #67692 and #80772) for the supports provided for the x-ray peak profile analysis.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2013

Authors and Affiliations

  • Y. Z. Chen
    • 1
    • 2
    Email author
  • G. Csiszár
    • 3
  • J. Cizek
    • 4
  • S. Westerkamp
    • 2
  • C. Borchers
    • 2
  • T. Ungár
    • 3
  • S. Goto
    • 5
  • F. Liu
    • 1
  • R. Kirchheim
    • 2
    • 6
  1. 1.State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’anP.R. China
  2. 2.Institut für MaterialphysikUniversität GöttingenGöttingenGermany
  3. 3.Department of Materials PhysicsEötvös UniversityBudapestHungary
  4. 4.Department of Low-Temperature PhysicsCharles University in PraguePraha 8Czech Republic
  5. 5.Department of Materials Science and EngineeringAkita UniversityAkitaJapan
  6. 6.International Institute for Carbon–Neutral Energy Research (WPI-I2CNER)Kyuchu University FukuokaJapan

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