Effect of Strain Rate on the Subsequent Softening and Precipitation Kinetics in a Nb-Microalloyed Steel

2005 ◽  
Vol 76 (9) ◽  
pp. 650-655
Author(s):  
Haiwen Luo ◽  
Yueling Qin ◽  
Jilt Sietsma ◽  
Sybrand van der Zwaag
Keyword(s):  
Strain Rate ◽  
Microalloyed Steel ◽  
Precipitation Kinetics ◽  
Nb Microalloyed Steel

Precipitation kinetics of NbC in ferrite of a Nb microalloyed steel

2004 ◽  
Vol 120 ◽  
pp. 563-570
Author(s):  
Y.-H. Choi ◽  
H.-C. Shin ◽  
C.-S. Choi ◽  
Y.-K. Lee
Keyword(s):  
Microalloyed Steel ◽  
Ferrite Matrix ◽  
Nucleation And Growth ◽  
Lever Rule ◽  
Time Diagram ◽  
Precipitation Kinetics ◽  
Good Match ◽  
Nb Microalloyed Steel ◽  
Kinetics Of ◽  
Temperature Time

The precipitation kinetics of NbC in ferrite matrix of a Nb microalloyed steel was investigated experimentally and numerically. The change in electrical resistivity due to NbC precipitation was measured at different constant temperatures as a function of holding time and was converted to the precipitation kinetics of NbC using a lever rule. The precipitation kinetics was compared with a classical nucleation and growth model and with the hardness. There is a good match among the calculated and measured precipitation kinetics of NbC and the hardness. The numerical and experimental results have been used to construct a precipitation-temperature-time diagram of NbC in ferrite matrix of the Nb microalloyed steel.

Effect of Initial Austenite Microstructure on the Softening – Precipitation Interaction in a Low Nb Microalloyed Steel

2007 ◽  
Vol 550 ◽  
pp. 429-434 ◽  
Author(s):  
C. Iparraguirre ◽  
Ana Isabel Fernández-Calvo ◽  
Beatriz López
Keyword(s):  
Grain Size ◽  
Microalloyed Steel ◽  
Recovery Process ◽  
Precipitation Kinetics ◽  
Austenite Grain Size ◽  
Austenite Grain ◽  
Nb Microalloyed Steel ◽  
Niobium Microalloyed Steel ◽  
Softening Fraction

The influence of initial grain size on the softening-precipitation interaction in a low niobium microalloyed steel has been investigated. The study has revealed that for the largest initial grain size (1000 μm), the recrystallised fraction remains lower than the softening fraction until relatively long times are reached. In contrast, for the smallest initial grain size (166 μm) both magnitudes are similar. As a result, precipitation interacts with recrystallisation in the case of the finest austenite grain size, whereas for the coarsest one, since recrystallisation is significantly retarded, interaction with recovery process is observed. Apparently, the initial austenite grain size does not affect precipitation kinetics.

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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