Thermal stresses and kinetics of phase transformation on the run-out table after hot strip rolling of low-carbon steels

2015 ◽  
Vol 83 (9-12) ◽  
pp. 1725-1736 ◽  
Author(s):  
M. Hasan Nasab ◽  
S. Serajzadeh
Keyword(s):  
Phase Transformation ◽  
Thermal Stresses ◽  
Carbon Steels ◽  
Low Carbon ◽  
Hot Strip Rolling ◽  
Strip Rolling ◽  
Low Carbon Steels ◽  
Hot Strip ◽  
Kinetics Of

Influence of Ti on Static Recrystallization in Near Net Shape Steels

2005 ◽  
Vol 500-501 ◽  
pp. 131-138 ◽  
Author(s):  
M. Arribas ◽  
Beatriz López ◽  
J.M. Rodriguez-Ibabe
Keyword(s):  
Carbon Steel ◽  
Static Recrystallization ◽  
Plain Carbon Steel ◽  
Carbon Steels ◽  
Low Carbon ◽  
Low Carbon Steels ◽  
Austenite Grain ◽  
Near Net Shape ◽  
Austenite Grain Growth ◽  
Kinetics Of

This study analyzes the recrystallization behaviour of Ti microalloyed low carbon steels processed by near net shape technology. Faster solidification rates associated with this technology allows for a finer precipitation of TiN particles that are very effective in controlling austenite grain growth during hot working. Furthermore, these small precipitates are shown to be able to retard ecrystallization compared to the kinetics of a plain carbon steel.

scholarly journals Optimization of Niobium Content in Direct Quenched High-Strength Steels

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 807
Author(s):  
Jaakko Hannula ◽  
David Porter ◽  
Antti Kaijalainen ◽  
Mahesh Somani ◽  
Jukka Kömi
Keyword(s):  
Phase Transformation ◽  
High Strength Steels ◽  
Significant Loss ◽  
Carbon Steels ◽  
Optimum Level ◽  
Low Carbon ◽  
Niobium Content ◽  
Low Carbon Steels ◽  
Finish Rolling ◽  
Different Levels

This paper focuses on understanding the effect of niobium content on the phase transformation behavior and resultant mechanical properties of thermomechanically rolled and direct-quenched low carbon steels containing 0.08 wt.% carbon. Investigated steels contained three different levels of niobium: 0, 0.02 and 0.05 wt.%. The continuous cooling transformation (CCT) diagrams covering cooling rates in the range 3–96 °C/s constructed based on the dilatometer studies showed only a minor effects of Nb on the phase transformation characteristics. In addition, experiments were performed for reheating and soaking the slabs at 1050–1200 °C and the results revealed that for these low-carbon steels, Nb failed to prevent the austenite grain growth during slab reheating. In the case of hot rolling trials, two different finish rolling temperatures of 820 °C and 920 °C were used to obtain different levels of pancaking in the austenite prior to direct quenching. The resultant microstructures were essentially mixtures of autotempered martensite and lower bainite imparting yield strengths in the range 940–1070 MPa. The lower finish rolling temperature enabled better combinations of strength and toughness in all the cases, predominantly due to a higher degree of pancaking in the austenite. The optimum level of Nb in the steel was ascertained to be 0.02 wt.%, which resulted not only in marginally higher strength but also without any significant loss of impact toughness.

Formation of Ultrafine Grained Low Carbon Steels via Martensite Deformation and Annealing

2006 ◽  
Vol 15-17 ◽  
pp. 750-755 ◽  
Author(s):  
H. Azizi-Alizamini ◽  
Matthias Militzer ◽  
Warren J. Poole
Keyword(s):  
Uniform Elongation ◽  
Carbon Steels ◽  
Grain Structure ◽  
Initial Structure ◽  
Low Carbon ◽  
Low Carbon Steels ◽  
Fine Grain ◽  
Ultrafine Grained ◽  
Kinetics Of

Recently, there has been a large interest in the development of low carbon steels with ultra fine grain structure using lean chemistries. Although these steels typically have superior strength, the lack of work hardening capability limits the uniform elongation and thus the formability of these kinds of steels. It has been reported by Tsuji and co-workers (2002) that straining of martensite as an initial structure can yield an ultra fine grain structure with good combination of strength and ductility. However, the detailed mechanism of the grain refinement has not yet been clarified. In the present work, the annealing behavior of a low carbon martensitic structure with and without deformation at room temperature has been systematically studied. It is proposed that the process of concurrent softening due to recovery and recrystallization and precipitation of carbides is different for the deformed and undeformed materials. Further, preliminary results have been found on the role of substitutional alloying elements such as Mo or Cr on the kinetics of the softening processes.

scholarly journals Computer modeling of microstructural change and strength of low carbon steel in hot strip rolling.

1987 ◽  
Vol 27 (6) ◽  
pp. 439-445 ◽  
Author(s):  
Masayoshi SUEHIRO ◽  
Kazuaki SATO ◽  
Yasushi TSUKANO ◽  
Hiroshi YADA ◽  
Takehide SENUMA ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Computer Modeling ◽  
Low Carbon Steel ◽  
Microstructural Change ◽  
Low Carbon ◽  
Hot Strip Rolling ◽  
Strip Rolling ◽  
Hot Strip

EBSD Investigation of Phase Transformation in Low Carbon Steels

2008 ◽  
pp. 243-250
Author(s):  
Sophie Lubin ◽  
Anne-Françoise Gourgues-lorenzon ◽  
Hélène Regle ◽  
Frank Montheillet ◽  
Brigitte Bacroix
Keyword(s):  
Phase Transformation ◽  
Carbon Steels ◽  
Low Carbon ◽  
Low Carbon Steels

scholarly journals Three-dimensional EBSD Analysis and TEM Observation for Interface Microstructure during Reverse Phase Transformation in Low Carbon Steels

2018 ◽  
Vol 58 (4) ◽  
pp. 742-750 ◽  
Author(s):  
Kengo Hata ◽  
Kazuki Fujiwara ◽  
Kaori Kawano ◽  
Masaaki Sugiyama ◽  
Takashi Fukuda ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Three Dimensional ◽  
Carbon Steels ◽  
Ebsd Analysis ◽  
Interface Microstructure ◽  
Low Carbon ◽  
Reverse Phase ◽  
Low Carbon Steels

Determination of the Recovery Kinetics during the Annealing of Cold Rolled Low Carbon Steels

2004 ◽  
Vol 467-470 ◽  
pp. 141-146 ◽  
Author(s):  
Ane Martínez-de-Guereñu ◽  
F. Arizti ◽  
Isabel Gutiérrez
Keyword(s):  
Coercive Field ◽  
Low Temperatures ◽  
Low Carbon Steel ◽  
Carbon Steels ◽  
Low Carbon ◽  
Low Carbon Steels ◽  
Dislocation Hardening ◽  
Cold Rolled ◽  
Kinetics Of

A cold rolled low carbon steel has been annealed at sufficiently low temperatures (300 to 500 °C) in order to promote recovery without interaction with recrystallization. The recovery kinetics has been followed by using magnetic coercive field (Hc) measurements. The microstructural changes associated with the observed decrease in Hc, produced by the recovery, have been analysed by TEM observations. The experimental data have been adequately modelled using various formulations reported in the literature. The kinetics of the dislocation hardening contribution to the yield stress has been derived from the kinetics of the coercive field, taking into account the existing linear relationship between both variables.

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