Model of hardening elements of tools steel C80U

• Autorzy: Domański T.
• Języki publikacji: EN

Abstrakty

EN

Hardening is one of the manufacturing processes used for improving mechanical properties such as strength, hardness and wear resistances of the mechanical components for machine parts. This paper describes modelling of the processes of steel C80U hardening. The first priority was given to thermal phenomena, phase transformations in a solid state and mechanical phenomena. A numerical algorithm of thermal phenomena was based on the Finite Elements Methods in the Galerkin formula of the heat transfer equations. In the model of phase transformations, in simulations heating process, isothermal or continuous heating (CHT) was applied, whereas in the cooling process continuous cooling (CCT) of the steel. In the model of mechanical phenomena, apart from thermal, plastic and structural strain, transformations plasticity was also taken into account. The stress and strain fields are obtained using the solution of the Finite Elements Method of the equilibrium equation in rate form. The thermophysical constants occurring in constitutive relation depend on temperature and phase composite. In order to determine plastic strain, the Huber-Mises condition with isotropic strengthening was applied, whereas for determination of transformation plasticity a modified Leblond model was used. In order to evaluate the quality and usefulness of the presented models a numerical analysis of temperature field, phase fraction, stress and strain associated hardening process of a cone-shaped fang lathe made of tool steel was carried out.

Słowa kluczowe

EN

heat treatment; phase transformations; stress; strain; numerical modelling

PL

obróbka cieplna; przemiany fazowe; naprężenie; odkształcenie; modelowanie numeryczne

• Wydawca: Wydawnictwo Politechniki Częstochowskiej
• Czasopismo: Journal of Applied Mathematics and Computational Mechanics
• Rocznik: 2014
• Tom: Vol. 13, nr 4
• Strony: 35--40
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Domański T.

• Institute of Mechanics and Machine Design, Czestochowa University of Technology Częstochowa, Poland

Bibliografia

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• [2] Ferguson B.L., Li Z., Freborg A.M., Modeling heat treatment of steel parts, Computational Materials Science 2005, 34, 274-281.
• [3] Kang S.H., Im Y.T., Thermo-elasto-plastic finite element analysis of quenching process of carbon steel, Journal of Materials Processing Technology 2007, 192-193, 381-390.
• [4] Cheng H., Xie J., Li J., Determination of surface heat-transfer coefficients of steel cylinder with phase transformation during gas quenching with high pressures, Computational Materials Science 2004, 29, 453-458.
• [5] Cherkaoui M., Berveiller M., Sabar H., Micromechanical modeling of martensitic transformation induced plasticity (TRIP) in austenitic single crystals, International Journal of Plasticity 1998, 14, 7, 597-626.
• [6] Bokota A., Domański T., Modelling and numerical analysis of hardening phenomena of tools steel elements, Archives of Metallurgy and Materials 2009, 3, 54, 499-511.
• [7] Bokota A., Domański T., Numerical analysis of thermo-mechanical phenomena of hardening process of elements made of carbon steel C80U, Archives of Metallurgy and Materials 2007, 2, 52, 277-288.
• [8] Leblond J.B., Devaux J., A new kinetic model for anisothermal metallurgical transformation in steels including effect of austenite grain size, Acta Metallurgica 1984, 52, 137-146.