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Modeling of Hot Ductility During Solidification of Steel Grades in Continuous Casting – Part I
Author(s) -
Senk Dieter,
Stratemeier Sonja,
Böttger Bernd,
Göhler Klaus,
Steinbach Ingo
Publication year - 2010
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201000021
Subject(s) - materials science , continuous casting , tearing , fractography , microstructure , slab , cracking , metallurgy , ductility (earth science) , hot work , casting , carbon steel , ultimate tensile strength , strain rate , composite material , tool steel , structural engineering , creep , engineering , corrosion
Abstract The present paper gives an overview of the simultaneous research work carried out by RWTH Aachen University and ThyssenKrupp Steel Europe AG. With a combination of sophisticated simulation tools and experimental techniques it is possible to predict the relations between temperature distribution in the mould, solidification velocity, chemical steel composition and, furthermore, the mechanical properties of the steel shell. Simulation results as well as experimentally observed microstructure parameters are used as input data for hot tearing criteria. A critical choice of existing hot tearing criteria based on different approaches, like critical strain and critical strain rate, are applied and developed. The new “damage model” is going to replace a basic approach to determine hot cracking susceptibility in a mechanical FEM strand model for continuous slab casting of ThyssenKrupp Steel Europe AG. Critical strains for hot cracking in continuous casting were investigated by in situ tensile tests for four steel grades with carbon contents in the range of 0.036 and 0.76 wt%. Additionally to modeling, fractography of laboratory and industrial samples was carried out by SEM and EPMA and the results are discussed.