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Journal of Materials Engineering and Performance

, Volume 26, Issue 4, pp 1562–1568 | Cite as

The Effect of Thermo-Mechanical Treatment on Structure of Ultrahigh Carbon PM Steel

  • Piotr Nikiel
  • Stefan Szczepanik
  • Stanisław Jan Skrzypek
  • Łukasz Rogal
Article
  • 189 Downloads

Abstract

The effects of thermo-mechanical treatment on selected properties related to the structure of Fe-0.85Mo-0.65i-1.4C powder metallurgy (PM) steel are reported. Three kinds of initial microstructure of specimens, i.e., pearlite + ferrite + cementite, martensite + retained austenite and α + spheroidized cementite were examined. Processing was carried out on a plastometer-dilatometer Bähr machine by compression cylindrical specimens at 775 °C at a strain rate of 0.001 s−1. X-ray diffraction was carried out with symmetrical Bragg-Brentano and grazing incident angle methods on a D8-Advance diffractometer with filtered radiation of cobalt CoK α . The following features were determined: texture, density of dislocations, density of vacancies, lattice parameter of Fe α and mean size of crystallites. Significant differences in structure were observed, especially in quenched specimen, as a result of the thermo-mechanical treatment. Regardless of initial state of the specimens, the determined properties were on a similar level. Crystallite size was in the range 97-106 nm, crystallite texture (I{200}/I{110}) × 10 = 1.15-1.62 and density of vacancies I{110}/I{220} = 7.06-7.52.

Keywords

crystallographic texture density of lattice defects powder metallurgy thermo-mechanical processing ultrahigh carbon steel x-ray 

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Copyright information

© ASM International 2017

Authors and Affiliations

  • Piotr Nikiel
    • 1
  • Stefan Szczepanik
    • 1
  • Stanisław Jan Skrzypek
    • 1
  • Łukasz Rogal
    • 2
  1. 1.AGH University of Science and TechnologyKrakówPoland
  2. 2.Institute of Metallurgy and Materials Science of the Polish Academy of SciencesKrakówPoland

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