Continously Cast Bloom With Internal Defect - Fem Model Optimization

Kvíčala, Miroslav; Hendrych, Aleš; Frydrýšek, Karel

doi:10.12776/ams.v20i1.205

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…High temperature properties of steelstrength and reduction of area are important characteristics, which have decisive influence on the formation of defects during continuous casting, thermo-mechanical and heat treatment, and welding [1][2][3][4]. As reported [5][6][7][8], in the high temperature region in low carbon and microalloyed steel the existence of 3 regions of brittleness is known:…”

Section: Introductionmentioning

confidence: 96%

Effect of Strain Rate on Hot Ductility of Low Carbon Steel

Mišičko

Longauerová²,

Vojtko³

et al. 2015

Acta Metall Slovaca

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Tensile strength and reduction of area for low carbon steel (LC) were measured. The experiment was performed in the high temperature region of stabile austenite at strain rates of 1 x 10 -3 s -1 and 1 x10 -2 s -1 usinga thermo-mechanical simulator GLEEBLE 1500. Tensile tests were carried out at test temperatures of 1000 -1300 °C after heating to the solution temperature of 1350 °C. The change of strain rate did not influence the strength values more significantly; however, it had effect on high temperature plastic properties at temperatures under solidification and also around 1100°C.The low ductility at 1100°C for the higher strain rates was caused probably by deformation induced precipitation of Al based particles along the prior austenite grain boundaries. It led to intergranular fracture, brought into effect by cleavage mechanism. The ratio of Mn/S is an important factor in LC steel, influencing the hot ductility. At low rates of Mn/S ≤ 20, there is a high probability of embrittlement in the stable austenite region. However, the higher ratio of Mn/S and low sulphur content, as it was in the tested steel, cannot warrant sufficient hot ductility in the stabile austenite region, and this way it excludes cracking during continuous casting. The plasticity also depends on the strain rate used. The low strain rate of 1 x 10 -3 s -1 can eliminate the embrittlement in the tested low carbon steel with Al and N 2 content of 0.049 % and 0.0068 %, respectively.

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Section: Introductionmentioning

confidence: 96%

Effect of Strain Rate on Hot Ductility of Low Carbon Steel

Mišičko

Longauerová²,

Vojtko³

et al. 2015

Acta Metall Slovaca

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“…Among them there is the enormous overheating temperature in the tundish [6], the low steel casting speed, the occurrence of central segregations [7], the non-uniform intensity of secondary cooling during casting, the insufficient reduction of central parts of the rolled stock [1], the unsuitable interval of the forming temperatures [8], and the non-uniform friction between the rolled stock and the roll [8]. Statistical analysis, artificial neural networks, finite elements methods, microchemical analysis and mictrostructure study led to successful reduction of the internal cracks occurrence [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Carbides Precipitation Mechanism in 34CrMo4 and 42CrMo4 Steels

Kvíčala

Štamborská²

2014

IJMSA

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The low-alloyed Cr-Mo steels (25CrMo4, 34CrMo4 and 42CrMo4) are used for production of important technical equipment parts in the petrochemical industry, for transportation of the gaseous hydrocarbons, concentrated acids, and lyes. They are also used for rolling of seamless tubes, in the production of pressure bottles, steel bolts, etc. Steel grades 25CrMo4 and 34CrMo4 represents materials with improved mechanical properties, mainly due to vanadium microalloying. Unfortunately, vanadium microalloyed steels are very sensitive to cracks occurrence after continuous casting and/or heating before hot rolling. This paper deals with vanadium rich precipitates MC, M 3 C 2 and M 7 C 3 formation during continuous casting process. It was verified that vanadium microalloyed steel 34CrMo4 exhibited different carbides formation mechanism and contained significantly higher rate of vanadium in M x C y carbides than steel grade 42CrMo4 using experimental data and ThermoCalc software. Understanding of the vanadium precipitation kinetics is necessary for manufacturing process optimization and internal defects limitation.

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Continously Cast Bloom With Internal Defect - Fem Model Optimization

Cited by 2 publications

References 12 publications

Effect of Strain Rate on Hot Ductility of Low Carbon Steel

Effect of Strain Rate on Hot Ductility of Low Carbon Steel

Simulation of the Carbides Precipitation Mechanism in 34CrMo4 and 42CrMo4 Steels

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