ANALYTICAL MODELS OF AUSTENITE TRANSFORMATION IN STEEL WITH ALLOWANCE FOR INTERNAL STRESSES

  • Serhii Bobyr
  • Andrii Borysenko
  • Dmytro Loshkarev
Keywords: AUSTENITE TRANSFORMATION, MARTENSITE, ANALYTICAL MODELS, INTERNAL STRESSES, HEAT TREATMENT

Abstract

The analysis of the presented works shows that mathematical modeling of austenite decomposition during heat treatment is possible using both ТТТ and ССT diagrams. Тhe effect of the stress-strain state arising in the process of heat treatment of parts on the kinetics of structural transformations is usually not taken into account. The experimental data accumulated to date do not reliably describe the effect of the stress state on structural transitions during the heat treatment of steels. A simple theoretical expression is proposed for calculating the amount of martensite formed as a function of the stress in the γ-phase. To reliably predict the structural state of steels during hot deformation and heat treatment, it is necessary to conduct a comprehensive study related to the experimental study of the effect of stresses on the transformations of all types and the creation of an adequate mathematical model of austenite decomposition based on the experimental data obtained, taking into account this effect.

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Published
2020-03-24
Section
Статті