Austenite recrystallization and carbonitride precipitation in niobium microalloyed steels

1989 ◽  
Vol 20 (1) ◽  
pp. 25-38 ◽  
Author(s):  
J. G. Speer ◽  
S. S. Hansen
Keyword(s):  
Microalloyed Steels ◽  
Carbonitride Precipitation ◽  
Austenite Recrystallization

Carbonitride precipitation in niobium/vanadium microalloyed steels

1987 ◽  
Vol 18 (3) ◽  
pp. 211-222 ◽  
Author(s):  
J. G. Speer ◽  
J. R. Michael ◽  
S. S. Hansen
Keyword(s):  
Microalloyed Steels ◽  
Carbonitride Precipitation

scholarly journals Effect of High Ti Contents on Austenite Microstructural Evolution During Hot Deformation in Low Carbon Nb Microalloyed Steels

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 165 ◽  
Author(s):  
Leire García-Sesma ◽  
Beatriz López ◽  
Beatriz Pereda
Keyword(s):  
Microstructural Evolution ◽  
Hot Deformation ◽  
Solute Drag ◽  
Carbon Steels ◽  
Microalloyed Steels ◽  
Low Carbon ◽  
Grain Sizes ◽  
Austenite Recrystallization ◽  
Pancaked Austenite

This work has focused on the study of hot working behavior of Ti-Nb microalloyed steels with high Ti contents (> 0.05%). The role of Nb during the hot deformation of low carbon steels is well known: it mainly retards austenite recrystallization, leading to pancaked austenite microstructures before phase transformation and to refined room temperature microstructures. However, to design rolling schedules that result in properly conditioned austenite microstructures, it is necessary to develop models that take into account the effect of high Ti concentrations on the microstructural evolution of austenite. To that end, in this work torsion tests were performed to investigate the microstructural evolution during hot deformation of steels microalloyed with 0.03% Nb and different high Ti concentrations (0.05%, 0.1%, 0.15%). It was observed that the 0.1% and 0.15% Ti additions resulted in retarded softening kinetics at all the temperatures. This retardation can be mainly attributed to the solute drag effect exerted by Ti in solid solution. The precipitation state of the steels after reheating and after deformation was characterized and the applicability of existing microstructural evolution models was also evaluated. Determined recrystallization kinetics and recrystallized grain sizes reasonably agree with those predicted by equations previously developed for Nb-Ti microalloyed steels with lower Ti concentrations (<0.05%).

scholarly journals Austenite Recrystallization–Precipitation Interaction in Niobium Microalloyed Steels

2009 ◽  
Vol 49 (6) ◽  
pp. 911-920 ◽  
Author(s):  
Stephanie Vervynckt ◽  
Kim Verbeken ◽  
Philippe Thibaux ◽  
Martin Liebeherr ◽  
Yvan Houbaert
Keyword(s):  
Microalloyed Steels ◽  
Austenite Recrystallization

Use of Zirconium in Microalloyed Steels

2006 ◽  
Vol 15-17 ◽  
pp. 834-839 ◽  
Author(s):  
A.R.B. Maia ◽  
C.R. Guinâncio ◽  
R.L. Germano ◽  
Paulo Rangel Rios ◽  
Ivani de S. Bott
Keyword(s):  
Grain Size ◽  
Qualitative Assessment ◽  
Microalloyed Steels ◽  
Preliminary Assessment ◽  
Actual Use ◽  
Austenite Recrystallization ◽  
Steel Refining ◽  
And Behavior ◽  
Austenitic Grain Size ◽  
Different Levels

In this work, three Zr microalloyed steels with different levels of Zr were compared with plain C-Mn, Nb and Nb-Ti steels. Austenitic grain size was compared as a function of temperature for these steels. A qualitative assessment of the potential of Zr to delay austenite recrystallization, was also undertaken. Of course, the actual use of Zr depends on many considerations: cost, availability and behavior during steel refining among others but this preliminary assessment was encouraging. It showed that the addition of Zr was able to prevent grain growth at typical reheating temperatures, around 1200oC. Also, Zr was able to delay austenite recrystallization.

Carbonitride precipitation in niobium/vanadium microalloyed steels

1987 ◽  
Vol 18 (2) ◽  
pp. 211-222 ◽  
Author(s):  
J. G. Speer ◽  
J. R. Michael ◽  
S. S. Hansen
Keyword(s):  
Microalloyed Steels ◽  
Carbonitride Precipitation

Austenite Recrystallization Model of High Ti Microalloyed Steels

2014 ◽  
Vol 1014 ◽  
pp. 25-32
Author(s):  
Xue Gang Xiong
Keyword(s):  
Strain Rate ◽  
Deformation Temperature ◽  
Microalloyed Steels ◽  
Kinetics Equation ◽  
Simulation Test ◽  
Recrystallization Kinetics ◽  
Strain And Strain Rate ◽  
Test Steel ◽  
Austenite Recrystallization ◽  
Temperature Strain

Through the thermal simulation test, the curves of austenite recrystallization kinetics is recorded, the influence of the parameters including deformation temperature, strain and strain rate on the austenite recrystallization fraction of Ti microalloyed steels is studied, the recrystallization kinetics equation is calculated, and the austenite recrystallization model of the test steel is obtained. The results improve that Ti inhibits both the dynamic and static austenite recrystallization in high Ti microalloyed steels.

On coherent carbonitride precipitation in commercial microalloyed steels

2003 ◽  
Vol 83 (2) ◽  
pp. 79-87 ◽  
Author(s):  
E. V. Morales ◽  
J. Gallego ◽  
H.-J. Kestenbach
Keyword(s):  
Microalloyed Steels ◽  
Carbonitride Precipitation
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