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  4. Characterization of physico-mechanical properties of Z-phase strengthened ferritic steels using internal friction measurements in the range 25 รท 750@C
 
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2017
Conference Paper
Title

Characterization of physico-mechanical properties of Z-phase strengthened ferritic steels using internal friction measurements in the range 25 รท 750@C

Abstract
The present research is dealing with the comparative study of inelastic/elastic behavior of reference ~12%Cr steel ZL3 and three new trial steels ZU1, ZU2, ZU3, with different ratio of alloying elements and equal content of Cr, using internal friction measurements. The samples were examined in as-received condition and after additional electric current tempering at 700@C under different fixed external mechanical tensions. The measurements of internal friction Q-1(T,ฦ) and shear modulus G ~ f2(T,ฦ) spectra were conducted in a vacuum (10-4 torr) in the temperature range 25รท750@C, using the relaxometer at the frequencies 1รท5Hz and amplitudes of deformation 10-5 รท 10-3. The values of deformation critical amplitudes for dislocation breakaway (first critical amplitude ฦ ;1) and for microplastic deformation beginning (second critical amplitude ฦ2) were determined in addition to the activation energies of relaxation processes in the investigated steels. It is shown that all the three trial steel samples in as-received condition exhibit considerably higher values of ฦ2 in comparison to those of reference ZL3 steel. Among them the ZU3 steel has the highest values of ฦ1 and ฦ2, and demonstrates the visible (~40%) increase in strength characteristics at elevated temperatures (600รท750@C), achieved by the additional electric current tempering under mechanical tension.
Author(s)
Kutelia, E.
Georgian Technical University, Tbilisi, Georgia
Dzigrashvili, T.
Georgian Technical University, Tbilisi, Georgia
Kukava, G.
Georgian Technical University, Tbilisi, Georgia
Darsavelidze, I.
Georgian Technical University, Tbilisi, Georgia
Kurashvili, I.
Georgian Technical University, Tbilisi, Georgia
Riedel, H.
Fraunhofer-Institut fรผr Werkstoffmechanik IWM  
Donth, B.
Saarschmiede GmbH-Freiformschmiede; Vรถlklingen
Mainwork
6th International Advances in Applied Physics and Materials Science Congress & Exhibition, AMPAS 2016. Proceedings  
Project(s)
Z-ultra  
Funder
European Commission EC  
Conference
International Advances in Applied Physics and Materials Science Congress & Exhibition (AMPAS) 2016  
DOI
10.1063/1.4975445
Language
English
Fraunhofer-Institut fรผr Werkstoffmechanik IWM  
Keyword(s)
  • ferritic steel

  • internal friction

  • shear modulus

  • dislocation breakaway

  • microplastic deformation

  • Z-Phase

  • electric current tempering

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