Hot Ductility Variations of ST52-3 Continuously Cast Steel within the Cast Strand

2010 ◽  
Vol 659 ◽  
pp. 13-18
Author(s):  
Viktor Gonda ◽  
Zsolt Csepeli ◽  
Ibolya Kardos ◽  
Balázs Verő ◽  
József Csizmadia
Keyword(s):  
Mechanical Properties ◽  
Cast Steel ◽  
Steel Grade ◽  
Hot Ductility ◽  
Microstructural Properties ◽  
Melt Temperature ◽  
Columnar Grains ◽  
Continuously Cast ◽  
Metallurgical Length ◽  
Crack Susceptibility

Along the metallurgical length at continuous casting, the temperature within the strand ranges from above melt temperature (>1500) to about 900 oC. In this range, mechanical properties drastically drop at above the zero deformation temperature (ZDT) and the zero strength temperature (ZST), therefore crack susceptibility increases. These temperatures depend on (local) chemical and microstructural properties. We investigated the change in ZDT and ZST for ST52-3 steel grade by taking samples from the as-cast strand from positions of the columnar grains and from the centreline segregated zone. We found more than 100 oC drop in ZDT due to segregations in the centreline compared to the columnar zone within the strand.

Study of Transverse Crack Formation of a Nb-Peritectic Steel

2012 ◽  
Vol 706-709 ◽  
pp. 1466-1473
Author(s):  
S. Nafisi ◽  
L. Collins ◽  
E.S. Szekeres
Keyword(s):  
Transverse Crack ◽  
Crack Formation ◽  
Cast Steel ◽  
Infrared Camera ◽  
Temperature History ◽  
Hot Ductility ◽  
Peritectic Steel ◽  
Ductility Trough ◽  
Continuously Cast ◽  
Crack Susceptibility

The problem of transverse crack formation in continuously cast steel has been an issue for over 30 years. The crack susceptibility depends not only to the steel composition, but also to the temperature history during casting. To improve the surface quality, two key solutions have been suggested; adjusting the straightening stage to an appropriate temperature range, out of hot ductility trough, and/or alloy modification. These solutions have certain limitations and difficulties still exist for grades such as peritectic steels containing Nb or V. In this article, the hot ductility of a peritectic steel grade with Nb has been studied under direct cast conditions. This was performed using a Gleeble 3800 thermo-mechanical simulator under two critical strain rates. In addition, the transverse crack formation and appearance, as well as the application of infrared camera to study the surface temperature profile of the slabs is presented.

scholarly journals Study of Solidification of Continuously Cast Steel Round Billets Using Numerical Modelling

2016 ◽  
Vol 61 (1) ◽  
pp. 221-226 ◽  
Author(s):  
M. Tkadlečková ◽  
L. Válek ◽  
L. Socha ◽  
M. Saternus ◽  
J. Pieprzyca ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Cast Steel ◽  
The Finite Element Method ◽  
Casting System ◽  
First Results ◽  
Continuously Cast ◽  
Metallurgical Length ◽  
Definition Of ◽  
The Individual

The paper is dedicated to the verification of solidification of continuously cast round steel billets using numerical modelling based on the finite element method. The aim of numerical modelling is to optimize the production of continuously cast steel billets of round format. The paper describes the pre-processing, processing and post-processing phases of numerical modelling. Also, the problems with determination of the thermodynamic properties of materials and the heat transfer between the individual parts of the casting system, including the definition of the heat losses along the casting strand in the primary and secondary cooling, were discussed. The first results of numerical simulation show the so-called thermal steady state of continuous casting. The temperature field, the metallurgical length and the thickness of the shell at the end of the mould were predicted. The further research will be concentrated on the prediction the risk of the cracks and the porosity based on the different boundary conditions.

Effects of MgO Nanoparticle Additions on the Structure and Mechanical Properties of Continuously Cast Steel Billets

2015 ◽  
Vol 47 (1) ◽  
pp. 461-470 ◽  
Author(s):  
Xiangzhou Gao ◽  
Shufeng Yang ◽  
Jingshe Li ◽  
Yindong Yang ◽  
Kinnor Chattopadhyay ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cast Steel ◽  
Continuously Cast ◽  
Mgo Nanoparticle

Changes in the mechanical properties and structure of continuously cast steel during hot deformation

1983 ◽  
Vol 25 (6) ◽  
pp. 468-471
Author(s):  
G. N. Migacheva ◽  
T. V. Filippova ◽  
S. P. Krotov ◽  
A. Ya. Korkin
Keyword(s):  
Mechanical Properties ◽  
Hot Deformation ◽  
Cast Steel ◽  
Continuously Cast

Inter-Columnar Macro-Segregation in Continuously Cast Steel; Characterization, Possible Reasons, and Consequences

2021 ◽  
Author(s):  
Seenivasan Rajiah ◽  
Manjini Sambandam ◽  
Sethu Prasanth Shanmugam ◽  
Saju Vikraman ◽  
Rajendra Taticherla
Keyword(s):  
Cast Steel ◽  
Continuously Cast

scholarly journals The Effect of Different Annealing Strategies on the Microstructure Development and Mechanical Response of Austempered Steels

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1041
Author(s):  
Eliseo Hernandez-Duran ◽  
Luca Corallo ◽  
Tanya Ros-Yanez ◽  
Felipe Castro-Cerda ◽  
Roumen H. Petrov
Keyword(s):  
Mechanical Properties ◽  
Retained Austenite ◽  
Mechanical Response ◽  
Steel Grade ◽  
The Other ◽  
Microstructure Development ◽  
Microstructural Refinement ◽  
Heterogeneous Distribution ◽  
Parent Austenite ◽  
Conventional Annealing

This study focuses on the effect of non-conventional annealing strategies on the microstructure and related mechanical properties of austempered steels. Multistep thermo-cycling (TC) and ultrafast heating (UFH) annealing were carried out and compared with the outcome obtained from a conventionally annealed (CA) 0.3C-2Mn-1.5Si steel. After the annealing path, steel samples were fast cooled and isothermally treated at 400 °C employing the same parameters. It was found that TC and UFH strategies produce an equivalent level of microstructural refinement. Nevertheless, the obtained microstructure via TC has not led to an improvement in the mechanical properties in comparison with the CA steel. On the other hand, the steel grade produced via a combination of ultrafast heating annealing and austempering exhibits enhanced ductility without decreasing the strength level with respect to TC and CA, giving the best strength–ductility balance among the studied steels. The outstanding mechanical response exhibited by the UFH steel is related to the formation of heterogeneous distribution of ferrite, bainite and retained austenite in proportions 0.09–0.78–0.14. The microstructural formation after UFH is discussed in terms of chemical heterogeneities in the parent austenite.

Influence of Melt Temperature on Compressive Plasticity of a Cu-Zr-Al Bulk Metallic Glass

2010 ◽  
Vol 146-147 ◽  
pp. 517-521
Author(s):  
Sheng Hui Xie ◽  
Xie Rong Zeng ◽  
Dong Ju Fu ◽  
Lei Zhao ◽  
Qiang Hu
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Metallic Glasses ◽  
Mechanical Performance ◽  
Casting Temperature ◽  
Thermal And Mechanical Properties ◽  
Micro Hardness ◽  
Melt Temperature ◽  
Hardness Tests ◽  
Important Solution

Cu47.5Zr47.5Al5 bulk metallic glasses (BMGs) were cast from the melt temperature 1143 to 1373 K. The structure, thermal and mechanical properties of the BMGs were investigated by XRD, DSC, HRTEM, dilatometric measurements, micro-hardness tests and uniaxial compression. The results indicate that the microstructure and mechanical performance of BMGs are closely affected by the casting temperature. Proper casting temperature ensures the BMGs with large relaxed excess free volume (REFV) and nano-crystallites, which favor the plastic deformation in Cu47.5Zr47.5Al5 BMGs. Regulating the preparing parameters is an important solution to good plasticity in BMGs.

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