Metal Science and Heat Treatment

, Volume 34, Issue 3, pp 164–165 | Cite as

Influence of heat-treatment conditions on the properties of cast VNL-3 steel

  • A. G. Bratukhin
Theory

Conclusions

  1. 1.

    An optimum combination of mechanical properties for the VNL-3 steel grade composition is achieved by a double heat treatment: heating to 1100°C (1 h) with air cooling, annealing at 600°C for 1/2 h plus quenching from 970°C, cold treatment at −50 to −70°C and annealing at 450°C. This heat treatment system can be recommended for obtaining high strength, although in order to secure better ductility, a strengthening heat treatment is carried out as follows: quenching from 970°C, annealing at 450°C and cold treatment at −50 to −70°C.

     
  2. 2.

    The heating temperature for the second heat-treatment stage is increased to 1100°C in order to correct casting defects (carburization). This yields σB ≥ 1000 N/mm2, σ≥18%, and a1=90–110 J/cm2.

     
  3. 3.

    Heating of the VNL-3 steel should be carried out in a shielding atmosphere or in a vacuum. The component surface can also be protected by applying the ÉVT-10 enamel.

     

Keywords

Heat Treatment Ductility Treatment System Carburization Optimum Combination 
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.
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Copyright information

© Plenum Publishing Corporation 1992

Authors and Affiliations

  • A. G. Bratukhin

There are no affiliations available

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