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Determination of Stress and Strain Fields in Cast and Heat Treated Bimetallic Rolling Mill Rolls
Neira Torres, Ingrid; Tchuindjang, Jérôme Tchoufack; Sinnaeve, Mario et al.
2015In Proceedings of the Iron & Steel Technology Conference and Exposition (AISTech 2015 & ICSTI)
Peer reviewed
 

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Keywords :
Phase transformation; residual stresses; FE simulations; bimetallic rolls; cooling; heat treatment; LiMaRC - Liège Materials Research Center
Abstract :
[en] Efficient work rolls for Hot Strip mill roughing stands are usually produced as bimetallic spun cast rolls with a core material made of Spheroidal Graphite Iron (SGI) and a shell material made of High Chromium Steel alloy, semi-High speed steel or adapted High Speed steel chemistry. In this paper, the evolution of stress fields and microstructure during post casting cooling and subsequent heat treatment of a standard high chromium steel is targeted. This knowledge is a first step to analyze the different events that could happen during these production stages and provides the residual stress fields as well as the final roll microstructure which are interesting data for roll service life. As far as roughing mill work rolls for roughing mills are concerned, current trends in terms of work roll design are forcing the roll producer to go towards higher usable shell thicknesses or increased residual shell thickness after scrap diameter in order to delay potential fatigue phenomena at the shell-core interface. One important parameter could not be evaluated in this study, it concerns the pollutions of the core material by alloying elements of the shell during production, which could affect to some extent the mechanical properties and microstructure of the core. The macroscopic thermo-mechanical-metallurgical Finite Element model used to perform simulations, takes into account coupled effects. Input data parameters are identified by experimental tests such as compression tests at constant strain rate and numerical procedures such as inverse method. After the model presentation, the material data set is commented. Whole experimental campaign could not be presented, however interested readers are referred to [1] where more details on the material study of High Chromium Steel alloy can be found. The section of simulation results show the phase transformation histories and stress profiles of a typical roll of diameter 1.2 m and shell thickness of 0.08 m. An additional sensitivity analysis of the results to some material data such as induced plasticity transformation coefficient and shift of the martensitic transformation start temperature parameters is reported. Finally, some conclusions analyze the interest and drawbacks of the described model and its results.
Disciplines :
Materials science & engineering
Mechanical engineering
Author, co-author :
Neira Torres, Ingrid
Tchuindjang, Jérôme Tchoufack  ;  Université de Liège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Sinnaeve, Mario
Flores, P.
Lecomte-Beckers, Jacqueline ;  Université de Liège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Habraken, Anne  ;  Université de Liège > Département ArGEnCo > Département ArGEnCo
Language :
English
Title :
Determination of Stress and Strain Fields in Cast and Heat Treated Bimetallic Rolling Mill Rolls
Publication date :
May 2015
Event name :
Iron & Steel Technology Conference and Exposition
Event organizer :
The Association for Iron & Steel Technology (AIST)
Event place :
Cleveland, Ohio, United States
Event date :
4-7 May 2014
By request :
Yes
Audience :
International
Main work title :
Proceedings of the Iron & Steel Technology Conference and Exposition (AISTech 2015 & ICSTI)
ISBN/EAN :
978-1-935117-46-9
Pages :
2706-2716
Peer reviewed :
Peer reviewed
Available on ORBi :
since 23 June 2015

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