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Mail address:
Chair for Simulation and Modeling of Metallurgical Processes Department of Metallurgy University of Leoben Franz-Josef-Str.18 A - 8700 Leoben Austria Office: Building 14 Hüttenmännisches Gebäude 3rd Floor, Room 320 Secr.: +43 / 3842 / 402 3101 Fax: +43 / 3842 / 402 3102 Email: smmp@mu-leoben.at |
Autumn Fjeld
 | Mail address: Chair for Simulation and Modelling of Metallurgical Processes Department of Metallurgy University of Leoben Franz-Josef-Str.18 A - 8700 Leoben Austria | Office: Building 14 (Hüttenmännisches Gebäude) 3rd Floor, Room 316 Direct: +43 / 3842 / 402 3108 Email: autumn .fjeld @ mu-leoben.at |
Modul V
Modelling of the Phase Distribution and Residual Stress in a Composite Mill Roll |
Eisenwerk Sulzau-Werfen R. & E, Weinberger AG |
Production of quality sheet metal in rolling mills dictates the need for high strength rolls with excellent wear resistance. Composite rolling mill rolls satisfy these demands with a high hardness, crack resistant outer shell and a nodular iron core material. Production of a composite roll requires a successive casting and treatment process which includes centrifugal casting of the shell material, subsequent conventional ingot casting of the core material into the shell-mold assembly, and final heat treatment. During casting of the core a thin layer of the shell material re-melts and mixes with the core material producing a layer of intermediate composition. A critical problem with composite rolls is this intermediate bonding layer between the shell and core, which is often the source of spalling and cracking due to poor cohesion between the layers. Additionally, the contamination of the core material with undesired alloying elements from the shell (e.g. Cr.) layer can be a problem. During casting of the core alloying elements can migrate from the shell-core interface into the core center during the partial re-melt of the high-Cr-content shell. These factors clearly have a significant influence on the microstructure of the shell, the intermediate bonding zone, and the core. Achieving a balance of re-melting to obtain optimal bonding at the shell-core interface without undesired contamination of the core material is a central objective of this investigation. |
The initial stage of the project is focused on the mold filling and solidification of the core, including the melting and re-solidification of the shell and the shell-core interface, the interaction at the interface, and the solute transport during solidification of the core. For this an Euler-Euler multiphase model will be used which incorporates the mass, momentum and species transport phenomena, as well as the interactions among the liquid melt and solid phases during solidification. Secondary stages of the project will investigate solid state phase transitions and accompanying stress-strain evolutions with a separate FEM model. |
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