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Metallurgist

, 53:362 | Cite as

Changes in mechanical characteristics during the strain-aging of wire rod made of steel Sv-08G2S

  • A. M. Nesterenko
  • A. B. Sychkov
  • V. I. Sukhomlin
  • S. Yu. Zhukova
Article
  • 54 Downloads

The Moldavian Metallurgical Plant has made a study of dynamic strain aging by subjecting specimens of wire rod made of steel Sv-08G2S to tension. Some of the steel had been microalloyed with boron, while another portion was made without this element. A stable reduction in strength properties was seen nearly throughout this range (the only exceptions were the increases in σu and Δσu in the boron-free wire rod for a test temperature of 350°C). There were some differences in the temperature dependences of ψ of steel Sv-08G2S made with and without boron. For the boron-bearing steel, the high values of ψ (77–80%) in the temperature range 200–450°C – the range that poses the greatest danger from the standpoint of reducing process ductility in drawing – in fact give the rod excellent ductility for deformation. Relatively low values of ψ are seen for the boron-free steel in the range 200–450°C. Wire rod made of steel Sv-08G2S (with or without boron) is characterized by a multiphase structure, and its matrix contains not only polygonal ferrite grains but also evenly distributed colonies of pearlite, bainite, and martensite. The stable decrease in strength properties at 100–150°C is connected with redistribution of the stresses between the structural components of the steel. Additional studies will be needed to explain the relatively stable level of ψ of boron-bearing steel Sv-08G2S wire rod in the range 200–450°C.

Key words

static and dynamic strain aging strain-hardening embrittlement impurity atoms dislocations mechano-thermal treatment microalloying boron temperature multiphase structure mechanical characteristics wire rod 

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Copyright information

© Springer Science+Business Media, Inc. 2009

Authors and Affiliations

  • A. M. Nesterenko
    • 1
  • A. B. Sychkov
    • 2
  • V. I. Sukhomlin
    • 3
  • S. Yu. Zhukova
    • 2
  1. 1.Nekrasov Institute of Ferrous MetallurgyNational Academy of Sciences of UkraineDnepropetrovskUkraine
  2. 2.Moldavian Metallurgical PlantRybnitsaMoldova
  3. 3.Dneprodzerzhinsk State Technical UniversityDneprodzerzhinsk, Dnepropetrovsk RegionUkraine

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