Effect of manganese on recrystallisation kinetics of niobium microalloyed steel

2002 ◽  
Vol 18 (4) ◽  
pp. 389-395 ◽  
Author(s):  
S.-H. Cho ◽  
K.-B. Kang ◽  
J. J. Jonas
Keyword(s):  
Microalloyed Steel ◽  
Niobium Microalloyed Steel ◽  
Kinetics Of

Studies on softening kinetics of niobium microalloyed steel using stress relaxation technique

2010 ◽  
Vol 4 (2) ◽  
pp. 197-201 ◽  
Author(s):  
Cheng-Liang Miao ◽  
Cheng-Jia Shang ◽  
Guo-Dong Zhang ◽  
Guo-Hui Zhu ◽  
Hatem Zurob ◽  
...  
Keyword(s):  
Stress Relaxation ◽  
Microalloyed Steel ◽  
Relaxation Technique ◽  
Niobium Microalloyed Steel ◽  
Kinetics Of

Studies on Softening Kinetics of Niobium Microalloyed Steel Using Stress Relaxation Technique

2012 ◽  
Vol 715-716 ◽  
pp. 794-799 ◽  
Author(s):  
Cheng Liang Miao ◽  
Cheng Jia Shang ◽  
Guo Dong Zhang ◽  
Guo Hui Zhu ◽  
Hatem S. Zurob ◽  
...  
Keyword(s):  
Stress Relaxation ◽  
Microalloyed Steels ◽  
Distinct Advantage ◽  
Low Carbon ◽  
Shape Processing ◽  
Physically Based ◽  
Near Net Shape ◽  
Niobium Microalloyed Steel ◽  
Relaxation Curves ◽  
Kinetics Of

Stress relaxation was studied in a series of low carbon, high Mn microalloyed steels containing 0.012, 0.06 and 0.1 wt% Nb. The stress-relaxation curves were modeled using a physically-based model that takes into account the time evolution of precipitation, recovery and recrystallization as well as their interactions. The results confirm that high Mn-high Nb design can offer distinct advantage over the low-Mn design for the application of near net shape processing.

Static Softening Behavior of Low Carbon High Niobium Microalloyed Steel

2020 ◽  
Vol 990 ◽  
pp. 36-43
Author(s):  
Dian Xiu Xia ◽  
Heng Ke Du ◽  
Xin En Zhang ◽  
Xiu Cheng Li ◽  
Ying Chao Pei
Keyword(s):  
Deformation Temperature ◽  
Static Recrystallization ◽  
Microalloyed Steel ◽  
Testing Machine ◽  
Low Carbon ◽  
High Deformation ◽  
Softening Behavior ◽  
Test Steel ◽  
Static Softening ◽  
Niobium Microalloyed Steel

The MMS-200 thermal simulation testing machine was used to study the static softening behavior of low carbon high niobium microalloyed steel. The effect of niobium to the static recrystallization softening behavior of the microalloy steel had been analyzed by establishing the kinetics model of static recrystallization and the micro-morphology of precipitates. The results indicated that: the static softening behavior of the tested steel significantly influenced by the deformation temperature and the interval pass time of the rolling processing. At relatively high deformation temperature and long interval pass time, the ratio of static softening was increased. Then the deformation temperature was lower to 950°C, and the static softening behavior of the test steel was ceased. But when the deformation temperature was higher than 1000°C, the static softening behavior of the test steel completely occurred. The activation energy of the test steel was 325·mol-1 by the established model calculated.

Effect of Strain-Induced Precipitation on the Austenite Non-recrystallization (Tnr) Behavior of a High Niobium Microalloyed Steel

2019 ◽  
Vol 50 (12) ◽  
pp. 5816-5838 ◽  
Author(s):  
V. Rajinikanth ◽  
Tipu Kumar ◽  
B. Mahato ◽  
Sandip Ghosh Chowdhury ◽  
Sandeep Sangal
Keyword(s):  
Microalloyed Steel ◽  
Niobium Microalloyed Steel

Effect of Austenite Deformation on Recrystallisation Behaviour in an X-70 Microalloyed Steel

2010 ◽  
Vol 89-91 ◽  
pp. 721-726 ◽  
Author(s):  
Lin Sun ◽  
Bradley P. Wynne ◽  
Eric J. Palmiere
Keyword(s):  
Microalloyed Steel ◽  
Pipeline Steel ◽  
Current Model ◽  
Compression Tests ◽  
Precipitation Kinetics ◽  
Start Time ◽  
Critical Temperatures ◽  
Softening Parameter ◽  
Fractional Softening ◽  
Kinetics Of

In the present study, the effect of austenite deformation on the recrystallisation behaviour in terms of recrystallisation-stop and recrystallisation-limit temperatures (T5% and T95%) of an X70 niobium microalloyed pipeline steel have been investigated by interrupted plane strain compression tests. The extents of recrystallisation are calculated using a modified fractional softening parameter. And the 20% and 60% of fractional softening were correlated to T5% and T95%. Quantitative optical metallography indicates that this method provides for a convenient and reliable experimental measurement of the critical temperatures associated with the recrystallisation of austenite. The recrystallisation kinetics and the precipitation kinetics of Nb(CN) were calculated using two widely applied models. The experimental results from this study suggest that the current model of precipitation kinetics might overestimate the precipitation start time.

scholarly journals Interaction between Recrystallization and Precipitation during Multipass Rolling in a Low Carbon Niobium Microalloyed Steel.

2001 ◽  
Vol 41 (11) ◽  
pp. 1373-1382 ◽  
Author(s):  
R. Abad ◽  
A. I. Fernández ◽  
B. López ◽  
J. M. Rodriguez-Ibabe
Keyword(s):  
Microalloyed Steel ◽  
Low Carbon ◽  
Niobium Microalloyed Steel

scholarly journals Influence of Vanadium Microalloying on Deformation-Induced Pearlite Transformation of Eutectoid Steel

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 268 ◽  
Author(s):  
Zhen Cai ◽  
Xinping Mao ◽  
Siqian Bao ◽  
Gang Zhao ◽  
Yaowen Xu
Keyword(s):  
Microalloyed Steel ◽  
Small Strain ◽  
Vanadium Content ◽  
Transformation Kinetics ◽  
Eutectoid Steel ◽  
Vanadium Nitrides ◽  
Austenite Grain ◽  
Thermomechanical Simulation ◽  
Vanadium Carbides ◽  
Kinetics Of

In order to investigate the influence of vanadium microalloying on deformation-induced pearlite transformation (DIPT) of eutectoid steel, thermomechanical simulation tests were carried out in this study. The following four compositions of vanadium microalloying were applied in the tests: vanadium free in Steel A, vanadium content of 0.1 mass% in Steel B, vanadium content of 0.27 mass% in Steel C, and vanadium content of 0.1 mass% with the addition of 0.02 mass% N in Steel D. The dissolution of vanadium and precipitation of vanadium carbides, nitrides, or carbonitridesand the effect of vanadium microalloying on the fraction and morphology of deformation-induced pearlite for different magnitudes of strain were examined, and the mechanism of the effect was elucidated. The results revealed that DIPT could be significantly improved by vanadium microalloying with the addition of N but decreased and postponed without the addition of N because vanadium nitrides or carbonitrides were precipitated in austenite under a small strain and facilitated the nucleation of pearlite both along the boundary of austenite grain (AG pearlite) and intragranular (IG pearlite). Moreover, transformation kinetics of DIPT was fitted and compared. The results further revealed that the rate of DIPT in vanadium-microalloyed steel with the addition of N was twice as fast as that in the vanadium-free steel. In order to ensure the complete spheroidization of lamellar cementites in vanadium-microalloyed steel, a comparison of the morphology of cementites revealed that a greater magnitude of strain was required.

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