scholarly journals Holding Time Influence on the Hot Ductility Behavior of a Continuously Cast Low Alloy Steel

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 64
Author(s):  
Marina Gontijo ◽  
Christian Hoflehner ◽  
Sergiu Ilie ◽  
Jakob Six ◽  
Christof Sommitsch
Keyword(s):  
Casting Process ◽  
Hot Ductility ◽  
Continuous Casting Process ◽  
Sem Images ◽  
Vacuum Atmosphere ◽  
Continuously Cast ◽  
Work Samples ◽  
Low Alloyed Steel ◽  
Reduction Of Area ◽  
Continuous Work

Cracking during the continuous casting process is undesirable and continuous work is being carried out to find further improvements and understand the mechanisms that lead to failure. Investigations on the hot ductility behavior of a continuously cast low alloyed steel using different holding times before straining were done in the present work. Samples were heated to melting temperature in a vacuum atmosphere and then cooled to one of the three test temperatures chosen: 750, 850, and 900 °C. When the desired temperature was reached, the sample was isothermally held for either 10, 90, 300, or 3600 s before the tensile test started, with a strain rate of 10−3 s−1. The reduction of area was measured, SEM images of the fractured surfaces were taken plus LOM images for the analysis of the microstructure. The results show that there was no significant change in the ductility at any of the temperatures until 300 s, with a change in behavior at 3600 s. This was further confirmed with the images and precipitation kinetics simulations. The results are described and compared.

NbCN precipitation during solidification of HSLA steels

1986 ◽  
Vol 44 ◽  
pp. 578-579
Author(s):  
M.G. Burke ◽  
N.S. Pottore ◽  
A.J. DeArdo
Keyword(s):  
Continuous Casting ◽  
Research Program ◽  
Casting Process ◽  
Hot Ductility ◽  
Continuous Casting Process ◽  
Ongoing Research ◽  
Hsla Steels ◽  
Continuously Cast

A TEM/STEM investigation has been directed towards improving the quality of continuously cast HSLA steels. The considerable economic advantages to be derived from continuous casting of HSLA steels is being arrested by the greatly reduced hot-ductility of the con-cast structures. Therefore, to determine the cause of this reduction in ductility, a microstructura1 investigation was conducted using unidirectiona11y solidified ingots to simulate the continuous casting process. This is part of an ongoing research program on Nb-bearing HSLA steels.

scholarly journals The Influence of Ti on the Hot Ductility of Nb-bearing Steels in Simulated Continuous Casting Process.

2002 ◽  
Vol 42 (3) ◽  
pp. 273-282 ◽  
Author(s):  
Haiwen Luo ◽  
L. Pentti Karjalainen ◽  
David A. Porter ◽  
Heidi-Marja Liimatainen ◽  
Yan Zhang
Keyword(s):  
Continuous Casting ◽  
Casting Process ◽  
Hot Ductility ◽  
Continuous Casting Process ◽  
Bearing Steels

Development and implementation of an innovative metal receiver for the intermediate ladles of caster slab

2019 ◽  
pp. 3-7
Author(s):  
M. Yu. Turchin ◽  
S. V. Sukharev ◽  
A. V. Zabolotsky ◽  
A. V. Shestakov ◽  
A. A. Berdyshev ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Working Conditions ◽  
Oxygen Converter ◽  
Intermediate Ladle ◽  
Casting Process ◽  
Special Design ◽  
Continuous Casting Process ◽  
Inner Surface ◽  
Continuously Cast

The features of the working conditions of intermediate ladles of caster slab are considered on the example of the 27-ton units of the oxygen-converter workshop of PJSC «Severstal». The results of mathematical modeling of hydrodynamics in an intermediate ladle with different turbulence dampers of the incoming jet are given. Designed, patented and implemented metal receiver (brand REYNSTREAM / REINSTREAM®) with a wave-like inner surface, designed to improve the quality of continuously cast billets, as well as providing increased stability and processability of the continuous casting process through a special design.. Ill. 6. Ref. 7.

Influence of Thermal History on the Hot Ductility of Ti-Nb Microalloyed Steels

2016 ◽  
Vol 879 ◽  
pp. 199-204 ◽  
Author(s):  
Coline Beal ◽  
Ozan Caliskanoglu ◽  
Christof Sommitsch ◽  
Sergiu Ilie ◽  
Jakob Six ◽  
...  
Keyword(s):  
Thermal Cycle ◽  
Crack Formation ◽  
Microalloyed Steel ◽  
Casting Process ◽  
Testing Temperature ◽  
Microalloyed Steels ◽  
Hot Ductility ◽  
Thermal Treatments ◽  
Continuous Casting Process ◽  
Nb Microalloyed Steel

The hot ductility of Ti-Nb microalloyed steel has been investigated to evaluate the sensitivity to surface crack formation during the continuous casting process. Tensile samples were subjected to different thermal treatments and were tested at deformation temperatures ranging from 650°C to 1000°C using a strain rate of 10-3s-1. It has been found, that the investigated steel evinced poor ductility over almost the whole testing temperature range characterized by marked grain boundary cracking, irrespective of which thermal cycle has been utilized or whether the samples have been melted or only reheated. Microstructural examinations and supplementary thermo-kinetic computer simulations revealed distinct Ti-Nb precipitation throughout the microstructure being responsible for the deteriorated materials hot ductility.

scholarly journals Effect of High Temperature Deformation on the Hot Ductility of Nb Microalloyed Steel

2005 ◽  
Vol 500-501 ◽  
pp. 115-122 ◽  
Author(s):  
Faramarz Zarandi ◽  
Steve Yue
Keyword(s):  
Continuous Casting ◽  
High Temperatures ◽  
Microalloyed Steel ◽  
Casting Process ◽  
Temperature Deformation ◽  
Hot Ductility ◽  
Continuous Casting Process ◽  
Billet Surface ◽  
Nb Microalloyed Steel ◽  
Very High

Low hot ductility of steel at the straightening stage of the continuous casting process is a problem found in steels containing microalloying and/or certain alloying additions. The thermal schedule undergone by the billet surface in the mill has a significant effect on the hot ductility. In this work, thermomechanical processing was employed to alleviate the problem of hot ductility in the Nb-microalloyed steel. Specimens were melted in situ and subjected to the billet surface thermal schedule in order to generate a microstructure similar to that present at the straightening stage of the continuous casting process. Some deformation schedules were incorporated with the thermal schedule at very high temperatures, specifically during solidification, within the d-ferrite region, and during the d®g transformation, and the hot ductility was subsequently evaluated at the end of the thermal schedule where the straightening operation is performed. After the thermal schedule alone, the steel exhibited a very low hot ductility at the straightening stage. It was found that deformation at very high temperatures prior to the straightening stage had a considerable effect on the hot ductility, either detrimental or beneficial, depending on the region in which the deformation has been executed. The mechanisms leading to loss and improvement of hot ductility are explained in this paper.

Macrostructure Prediction of CC Slabs

2005 ◽  
Vol 473-474 ◽  
pp. 375-380
Author(s):  
Mihály Réger ◽  
Balázs Verő ◽  
Heli Kytönen ◽  
Seppo Louhenkilpi ◽  
Árpád Szélig
Keyword(s):  
Mathematical Modeling ◽  
Continuous Casting ◽  
Mushy Zone ◽  
Interdendritic Liquid ◽  
Casting Process ◽  
Point Of View ◽  
Technological Characteristic ◽  
Continuous Casting Process ◽  
Continuously Cast ◽  
Characteristic Features

The inner structure of the continuously cast semis has a great importance from the point of view of further processing and application. The main reason for this is the very direct effect of the inner structure’s features (ie. porosity, macrosegregations, geometry of primary dendrites) on the technological characteristic features of the semis during further processing (ie. crack sensitivity, formability, etc.). The paper deals with the possible ways of macrostructure determination on the basis of the results of mathematical modeling of continuous casting process. We pay a special attention to the columnar-equiaxed transition as a function of heat parameters of the casting process and to the macrosegregation formation caused by the motion of solute enriched interdendritic liquid in the mushy zone.

The Air Reoxidation and the Formation of Large Inclusions in Continuous Casting Process

1973 ◽  
Vol 59 (1) ◽  
pp. 72-84 ◽  
Author(s):  
Kichinosuke MATSUNAGA ◽  
Chikakazu NAMIKI ◽  
Taiji ARAKI
Keyword(s):  
Continuous Casting ◽  
Casting Process ◽  
Continuous Casting Process
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