Strength of Materials

, Volume 14, Issue 10, pp 1381–1385 | Cite as

Effects of hardening and localization of strain in strain aging of technical purity iron

  • Yu. P. Gul'
  • M. M. Ryabchii
  • V. V. Ryabchii
  • I. F. Kaminskaya
Scientific-Technical
  • 39 Downloads

Conclusions

  1. 1.

    The hardening effect in strain aging of technical purity iron increases with an increase in the degree of preliminary strain by tension (by increasing the density of introduced dislocations) regardless of the character of strain distribution in the sample if the aging time is sufficient for occurrence of hardening according to the “stopper” mechanism.

     
  2. 2.

    With nonuniform strain distribution in the sample (completion of preliminary strain within the limits of the yield plateau or with the formation of a neck) there is observed the phenomenon of “geometric loss of strength,” which is presumably related to an increase in the effective value of the stress concentration factor in aging and is especially marked in short aging (comparatively weak blocking of dislocations).

     
  3. 3.

    Intensification of strain hardening in strain aging is accompanied by strengthening of the tendency of strain aged technical purity iron toward localization of strain, which does not contradict the classical equations of Konsider and Hart.

     
  4. 4.

    Equations were obtained making it possible to describe the influence of strain aging on localization of strain in uniaxial tension.

     

Keywords

Iron Classical Equation Stress Concentration Stopper Aging Time 

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Literature cited

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    V. K. Babich, Yu. P. Gul', and I. E. Dolzhenkov, Strain Aging of Steel [in Russian], Metallurgiya, Moscow (1972).Google Scholar
  2. 2.
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    D. Mak Lin, The Mechanical Properties of Metals [in Russian], Metallurgiya, Moscow (1965).Google Scholar
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    Yu. P. Gul', “Physical aspects of embrittlement of strain aged steel,” in: The Physics of Fracture. Summaries of Papers for the Fourth All-Union Conference [in Russian], Part 1, Inst. Probl. Materialovedenie, Kiev (1980), pp. 171–172.Google Scholar
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Copyright information

© Plenum Publishing Corporation 1983

Authors and Affiliations

  • Yu. P. Gul'
    • 1
  • M. M. Ryabchii
    • 1
  • V. V. Ryabchii
    • 1
  • I. F. Kaminskaya
    • 1
  1. 1.Dnepropetrovsk Metallurgical InstituteUSSR

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