Effects of chromium on the microstructure and hot ductility of Nb-microalloyed steel

2021 ◽  
Vol 28 (6) ◽  
pp. 1011-1021
Author(s):  
Yang Liu ◽  
Yan-hui Sun ◽  
Hao-tian Wu
Keyword(s):  
Microalloyed Steel ◽  
Hot Ductility ◽  
Nb Microalloyed Steel

scholarly journals Hot ductility behavior of a continuously cast Ti-Nb microalloyed steel

2019 ◽  
Author(s):  
Christian HOFLEHNER ◽  
Coline BEAL ◽  
Christof SOMMITSCH ◽  
Jakob SIX ◽  
Sergio ILIE
Keyword(s):  
Microalloyed Steel ◽  
Hot Ductility ◽  
Continuously Cast ◽  
Nb Microalloyed Steel

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.

scholarly journals Effect of Strain Rate on the Hot Ductility Behavior of a Continuously Cast Ti–Nb Microalloyed Steel

2020 ◽  
Vol 91 (12) ◽  
pp. 2000222
Author(s):  
Marina Gontijo ◽  
Christian Hoflehner ◽  
Paul Estermann ◽  
Sergiu Ilie ◽  
Jakob Six ◽  
...  
Keyword(s):  
Strain Rate ◽  
Microalloyed Steel ◽  
Hot Ductility ◽  
Continuously Cast ◽  
Nb Microalloyed Steel

Effect of Controlled Hot Rolling Parameters on Microstructure of a Nb-Microalloyed Steel Sheet

2011 ◽  
Author(s):  
Daavood Mirahmadi Khaki ◽  
Amir Abedi ◽  
Francisco Chinesta ◽  
Yvan Chastel ◽  
Mohamed El Mansori
Keyword(s):  
Hot Rolling ◽  
Steel Sheet ◽  
Microalloyed Steel ◽  
Nb Microalloyed Steel
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