Simulations and numerical model of steel hardening process

This paper describes modelling of the processes of steel C80U hardening. The first priority was given to thermal phenomena, phase transformations in solid state and mechanical phenomena. The issue of heat conductivity was based on the equation of transient heat conductivity with unit source. Numeric...

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Bibliographic Details
Format: Conference Proceeding
Language:English
Subjects:
Algorithms
Computer simulation
Constitutive relationships
Equilibrium equations
Finite element method
Heat conductivity
Kinematics
Mathematical models
Modulus of elasticity
Numerical analysis
Phase composition
Phase transitions
Plastic flow
Tangent modulus
Temperature dependence
Temperature effects
Thermal conductivity
Thermal transformations
Thermophysical properties
Tool steels
Transformations (mathematics)
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Summary:This paper describes modelling of the processes of steel C80U hardening. The first priority was given to thermal phenomena, phase transformations in solid state and mechanical phenomena. The issue of heat conductivity was based on the equation of transient heat conductivity with unit source. Numerical algorithms for kinetics of phase transformations and evaluation of fractions of phases were built on the diagrams of continuous heating and cooling of tool steel. The theoretical model of phase transformations was then verified by experiments. In modelling of mechanical phenomena, the equilibrium equations and constitutive relations were adopted in the rate form. Plastic strains are determined by the theory of non-isothermal plastic flow associated with the Huber-Misses condition. The model assumed isotropic and kinematics strengthening and besides elastic, thermal, structural, plastic strains and transformations plasticity were included. Thermophysical properties including the Young’s modulus, tangent modulus and yield strength were directly dependent on temperature and material phase composition. The issues of thermo-elastic-plastic were solved using the finite element method. Implemented algorithms were applied in computer stimulation of hardening of non-alloy tool steel. Numerical analysis of thermal effects and phase transformations, i.e. stress and strains in mechanical phenomena in a tool steel material undergoing hardening was made.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4913125