Hot forming and heat treatment simulation in a steel mill

• Autorzy: Redl C. , Tian B , Wieser V. , Sommitsch C.

Warianty tytułu

PL

Modelowanie procesów odkształcania na gorąco i obróbki cieplnej prowadzonych na walcowni

• Konferencja: 14th KomPlasTech Conference, Zakopane, January 14-17, 2007
• Języki publikacji: EN

Abstrakty

EN

Numerical simulation is nowadays becoming a standard tool in industrial processes. This paper provides an insight about the usage of finite element calculations in the development and production process in the steel mill of Böhler Edelstahl GmbH, Kapfenberg, Austria. Simulation methods are used all along the value chain at the mill starting with melting and casting of the steel. Nevertheless this paper focuses on the simulation of hot forming and heat treatment as well as on the simulations done as a service for our customers. The activities of finite element simulation of hot rolling concentrate on one side on the basic principles, for example, widening, strain distributions, grain models etc. On the other side, typical chains of hot rolling have been simulated and the results verified by comparing measured parameters with calculations. As an example the widening of a cold work steel at different temperatures is presented and compared with other steel grades. Considering as example a hot work tool steel of type 1.2343 the production chain from forging over the pre heat treatment at the mill to the application as a tool for aluminium extrusion is surveyed. The forming of the casted and remelted steel block is done on a radial forging machine of the type GFM SX55. The simulation takes into account five passes and delivers strains and temperatures within the work piece. Afterwards the pre heat treatment cycle of the part consisting of heating, quenching in polymer solution and subsequent air cooling is modelled. Simulation services are provided to the customers to optimize the material selection for their specific applications. The aforementioned tool steel is used as liner or die material in the extrusion industry. By a combination of a visco-plastic material model and a damage model it is necessary to predict the lifetime of the tools in use. In order to obtain the residual stresses and phase distribution after nitrogen quenching a heat treatment simulation of the die is performed. Afterwards a simulation of the extrusion process is carried out to get the distribution of effective stress and temperature in the die. The calculated life time as well as the predicted location of the maximum damage agrees well with observations from real extrusion processes.

Słowa kluczowe

EN

simulation; radial forging; heat treatment; lifetime prediction; hot work steel

• Wydawca: Wydawnictwa AGH
• Czasopismo: Computer Methods in Materials Science
• Rocznik: 2007
• Tom: Vol. 7, No. 1
• Strony: 5--10
• Opis fizyczny: Bibliogr. 9 poz., rys.

Twórcy

autor

Redl C.

autor

Tian B

autor

Wieser V.

autor

Sommitsch C.

• Bohler Edelstahl GmbH, 8605 Kapfenberg, Austria

Bibliografia

• Chaboche, J.-L., 1993, Cyclic viscoplastic constitutive equations, Part I: A thermo-dynamically consistent formulation, J. Appl. Mechanics, 60, 813 - 821.
• Harrer, O., Wallner, S., Wieser, V., 2005, Numerical simulation of forging alloy 718, Proc. 8th Conf. on Technology of Plasticity, Verona, (CD ROM).
• Harrer, O., Wallner, S., Wieser, V., 2005, Simulation des Reckschmiedens - Ein Erfahrungsbericht, Proc. Sommerschule Schmiedetechnik, Fladnitz/Teichalm, Austria, 133- 141, (in German).
• Yeh, N.-M., Krempl, E., 1993, An incremental life prediction law for multiaxial creep-fatigue interaction and thermomechanical loading, in: Advances in Multiaxial Fatigue, ASTMSTP 7/97, eds. McDowell, D.L., Ellis, R., Philadelphia, 107-109.
• Redl, C., Friesenbichler, C., Wieser, V., 2006, Numerical Simulation of Residual Stresses during the Heat Treatment of Dies made of Hot Work Tool Steel, Proceedings ECRS7, eds. Reimers, W., Quander, S., Berlin, 433 - 438.
• Redl, C., Wieser, V., Sommitsch, C., Wlanis, T., Schutzenhöfer, W., Gaudin, S., Geigges, B., 2006, Investigation and Numerical Modelling of Extrusion Tool Life Time, Proc. 7th Tooling Conf., eds., Rosso, M. Actis Grande, M, Ugues, D, Torino, 589 - 596.
• Reiter, G., Schutzenhöfer, W., Wtirzinger, P., Zinner, S., 2005, Optimization and Detailed Validation of a VAR model, Proc. Symp. on Liquid Metal Processing and Casting, Santa Fe, 7-12.
• Schutzenhöfer, W., Redl, C., Schweiger, H., Siller, I., Dickinger, N., Schneider, R., 2005, Comparison of Different Remelted Hot-Work Tool Steels and Their Distortion, Residual Stresses and Other Properties. Experiments and Simulation, Proc. IDE 2005, eds., Zoch, H.-W., Lübben T., Bremen, 65 - 74.
• Schutzenhöfer, W., Reiter, G., Rabitsch, R., Tanzer, R., Ludwig, A., Kharicha, A., Wu, M., Mackenbrock, A., Gaumann, M., Maronnier, V., Kóser, O., Scholz, H., Sorci, R., Arcobello-Varlese, F., Carosi, A., 2006, Modelling and Validation of the Protective Gas Electro Slag Remelting Process, EUROPAM, Toulouse.