Microstructure Evolution Characterization of Multi-Pass Hot Rolling Simulation of Nb-Ti Microalloyed Steel

2014 ◽  
Vol 936 ◽  
pp. 1141-1145
Author(s):  
Bin Shen ◽  
Song He Zhu ◽  
Heng Hua Zhang
Keyword(s):  
Hot Rolling ◽  
Static Recrystallization ◽  
Microalloyed Steel ◽  
Measured Data ◽  
Mean Flow ◽  
Austenite Grain Size ◽  
Austenite Grain ◽  
Mean Flow Stress ◽  
The Mean

In this study, a improved mathematical model was developed for Nb-Ti microalloyed steel during hot rolling simulation. Using the compression test, the dynamic and static recrystallization characteristics of Nb-Ti microalloyed steel were studied. Though multi-pass hot rolling simulation, it is found that the recrystallization during hot rolling can play an important role, it can make the mean flow stress lower and refine the grains. And respective comparison between calculated and measured data of microstructure showed some of the validation of the built model. Meanwhile, the evolution characteristic of average austenite grain size during hot rolling can be achieved by theoretical model and experiment.

scholarly journals Forecasting the mean flow stress of carbon and low-alloy steels in hot rolling on a strip mill

2018 ◽  
Vol 461 ◽  
pp. 012051 ◽  
Author(s):  
Valeriy V Shkatov ◽  
Igor P Mazur ◽  
Victor V Shkatov
Keyword(s):  
Flow Stress ◽  
Hot Rolling ◽  
Low Alloy Steels ◽  
Mean Flow ◽  
Mean Flow Stress ◽  
Alloy Steels ◽  
The Mean

Influence of austenite grain size on recrystallisation–precipitation interaction in a V-microalloyed steel

2007 ◽  
Vol 447 (1-2) ◽  
pp. 11-18 ◽  
Author(s):  
A. Quispe ◽  
S.F. Medina ◽  
M. Gómez ◽  
J.I. Chaves
Keyword(s):  
Grain Size ◽  
Microalloyed Steel ◽  
Austenite Grain Size ◽  
Austenite Grain

Prediction for the austenite grain size in the presence of growing particles in the weld HAZ of Ti-microalloyed steel

2007 ◽  
Vol 459 (1-2) ◽  
pp. 40-46 ◽  
Author(s):  
Joonoh Moon ◽  
Jongbong Lee ◽  
Changhee Lee
Keyword(s):  
Grain Size ◽  
Microalloyed Steel ◽  
Austenite Grain Size ◽  
Austenite Grain

scholarly journals Study of Static Recrystallization Kinetics and the Evolution of Austenite Grain Size by Dynamic Recrystallization Refinement of an Eutectoid Steel

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1289
Author(s):  
Cesar Facusseh ◽  
Armando Salinas ◽  
Alfredo Flores ◽  
Gerardo Altamirano
Keyword(s):  
Grain Size ◽  
Dynamic Recrystallization ◽  
Static Recrystallization ◽  
Controlled Rolling ◽  
Strain Rates ◽  
Peak Strain ◽  
Compression Tests ◽  
Eutectoid Steel ◽  
Austenite Grain Size ◽  
Austenite Grain

Interrupted and continuous hot compression tests were performed for eutectoid steel over the temperature range of 850 to 1050 °C and while using strain rates of 0.001, 0.01, 0.1, and 1 s−1. The interrupted tests were carried out to characterize the kinetics of static recrystallization(SRX) and determinate the interpass time conditions that are required for initiation and propagation of dynamic recrystallization (DRX), while considering that the material does not contain microalloying elements additions for the recrystallization delay. Continuous testing was used to investigate the evolution of the austenite grain size that results from DRX. The results indicate that carbon content accelerates the SRX rate. This effect was observed when the retardation of recrystallization due to a decrease in deformation temperature from 1050 to 850 °C was only about one order of magnitude. The expected decelerate effect on the SRX rate when the initial grain size increases from 86 to 387 µm was not significant for this material. Although the strain parameter has a strong influence on SRX rate, in contrast to a lesser degree of strain rate, both of the effects are nearly independent of the chemical composition. The calculated maximum interpass times that are compatible with DRCR (Dynamic Recrystallization Controlled Rolling), for relatively low strain rates, suggest that the onset and maintaining of the DRX is possible. However, while using the empirical equations that were developed in the present work to estimate the maximum times for high strain rates, such as those observed in the wire and rod mills, indicate that the DRX start is feasible, but maintaining this mechanism for 5% softening in each pass after peak strain is not possible.

Study of austenite grain size of microalloyed steel by simulating initial solidification during continuous casting

2014 ◽  
Vol 42 (1) ◽  
pp. 41-48 ◽  
Author(s):  
Y. Li ◽  
G. Wen ◽  
L. Luo ◽  
J. Liu ◽  
P. Tang
Keyword(s):  
Grain Size ◽  
Continuous Casting ◽  
Microalloyed Steel ◽  
Austenite Grain Size ◽  
Austenite Grain ◽  
Initial Solidification

The Influence of Initial Grain Size and Strain Sequence of Slab Hot Rolling on the Austenite Evolution of Peritectic Microalloyed Plate Steels

2014 ◽  
Vol 1019 ◽  
pp. 339-346 ◽  
Author(s):  
Rorisang Maubane ◽  
Kevin Banks ◽  
Waldo Stumpf ◽  
Charles Siyasiya ◽  
Alison Tuling
Keyword(s):  
Grain Size ◽  
Hot Rolling ◽  
Plain Carbon Steel ◽  
Microalloyed Steels ◽  
Heating Rates ◽  
Austenite Grain Size ◽  
Soaking Time ◽  
Austenite Grain ◽  
Dynamic Recrystallisation ◽  
Temperature Constant

The influence of the strain sequence during slab hot rolling (also known as “roughing”) on the evolution of austenite in plain carbon, C-Mn-V and C-Mn-Nb-Ti-V steels was investigated. Reheating and roughing simulations were conducted in a Bähr deformation dilatometer using a constant austenitising temperature, constant soaking time and various heating rates and roughing strain sequences. Stress analysis was used to quantify the austenite softening behaviour and the prior austenite grain size was measured from quenched specimens. The austenite grains of the plain carbon steel were coarser than those of both microalloyed steels, with the C-Mn-Nb-Ti-V grade being the finest due to effective pinning of the grain boundaries. Pass strains greater than 0.2 were sufficient for initiation of dynamic recrystallisation (DRX) for the C-Mn and C-Mn-V steels and led to uniform austenite microstructure with austenite grain sizes less than 40µm after the roughing stage.

scholarly journals Effect of Initial Microstructure on the Toughness of Coarse-Grained Heat-Affected Zone in a Microalloyed Steel

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4760
Author(s):  
Minghao Shi ◽  
Man Di ◽  
Jian Zhang ◽  
Rangasayee Kannan ◽  
Jing Li ◽  
...  
Keyword(s):  
Grain Size ◽  
Base Metal ◽  
Thermal Cycle ◽  
Microalloyed Steel ◽  
Charpy Impact ◽  
Coarse Grained ◽  
Austenite Grain Size ◽  
Austenite Grain ◽  
Prior Austenite Grain Size ◽  
Prior Austenite Grain

Toughness of the coarse-grained-heat-affected-zone (CGHAZ) strongly depends on the prior austenite grain size. The prior austenite grain size is affected not only by chemical composition, thermal cycle, and dissolution of second-phase particles, but also by the initial microstructure. The effect of base metal microstructure (ferrite/pearlite obtained by air cooling and martensite obtained by water-quenching) on Charpy impact toughness of the CGHAZ has been investigated for different heat inputs for high-heat input welding of a microalloyed steel. A welding thermal cycle with a heat input of 100 kJ/cm and 400 kJ/cm were simulated on the MMS-300 system. Despite a similar microstructure in the CGHAZ of both the base metals, the average Charpy impact energy for the air-cooled base metal was found to be higher than the water-quenched base metal. Through thermo-kinetic simulations, it was found that a higher enrichment of Mn/C at the ferrite/austenite transformation interface of the CGHAZ of water-quenched base metal resulted in stabilizing austenite at a lower A1 temperature, which resulted in a coarser austenite grain size and eventually lowering the toughness of the CGHAZ.

The mean size of plate martensite: influence of austenite grain size, partitioning, and transformation heterogeneity

1985 ◽  
Vol 16 (3) ◽  
pp. 329-336 ◽  
Author(s):  
J. R. C. Guimarães ◽  
A. Saavedra
Keyword(s):  
Grain Size ◽  
Plate Martensite ◽  
Austenite Grain Size ◽  
Austenite Grain ◽  
Mean Size ◽  
The Mean

Effect of austenite grain size on isothermal bainite transformation in low carbon microalloyed steel

2011 ◽  
Vol 27 (11) ◽  
pp. 1657-1663 ◽  
Author(s):  
L Y Lan ◽  
C L Qiu ◽  
D W Zhao ◽  
X H Gao ◽  
L X Du
Keyword(s):  
Grain Size ◽  
Microalloyed Steel ◽  
Low Carbon ◽  
Bainite Transformation ◽  
Austenite Grain Size ◽  
Austenite Grain ◽  
Carbon Microalloyed
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