Austenite recrystallization diagram for steel R12F4K5

1977 ◽  
Vol 19 (11) ◽  
pp. 956-959
Author(s):  
I. O. Khazanov
Keyword(s):  
Recrystallization Diagram ◽  
Austenite Recrystallization

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%).

Characteristics of the Static Recrystallization Kinetics of an Intercritically Deformed C-Mn Steel

2004 ◽  
Vol 467-470 ◽  
pp. 293-298 ◽  
Author(s):  
Haiwen Luo ◽  
Jilt Sietsma ◽  
Sybrand van der Zwaag
Keyword(s):  
Stress Relaxation ◽  
Static Recrystallization ◽  
Avrami Exponent ◽  
Recrystallization Kinetics ◽  
Ferrite Fraction ◽  
Austenite Recrystallization ◽  
Austenite Grains ◽  
Intercritical Region ◽  
Mn Steel ◽  
Kinetics Of

The austenite recrystallization kinetics in the intercritical region of a C-Mn steel is investigated by means of stress relaxation tests. It is found that the Avrami exponent, n, decreases significantly with decreasing temperature, i.e. with increasing ferrite fraction. This behaviour deviates from that of austenite recrystallization in the purely austenitic state, in which case the Avrami exponent is constant and independent of temperature and deformation. To interpret this, the influence of spatial variation of the plastic strain in the intercritical austenite grains on recrystallization kinetics is modelled quantitatively. The modelling results seem to indicate that the strain heterogeneity is responsible for the decreasing Avrami exponent with decreasing intercritical temperature.

scholarly journals Evolution of Austenite Recrystallization and Grain Growth Using Laser Ultrasonics

2008 ◽  
Vol 39 (4) ◽  
pp. 897-907 ◽  
Author(s):  
S. Sarkar ◽  
A. Moreau ◽  
M. Militzer ◽  
W.J. Poole
Keyword(s):  
Grain Growth ◽  
Laser Ultrasonics ◽  
Austenite Recrystallization

Study on After-Forging Austenite Recrystallization Rule of Low-Pressure Rotor Steel 26Cr2Ni4MoV with Thermo-Torsion Method

2009 ◽  
Vol 628-629 ◽  
pp. 635-640
Author(s):  
Li Yong Ni ◽  
Peng Chao Kang ◽  
Zhu Bai Liu ◽  
Wen Hua Yang
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Static Recrystallization ◽  
Low Pressure ◽  
Nucleation And Growth ◽  
Rotor Steel ◽  
Theoretical Base ◽  
Torsion Experiment ◽  
Austenite Recrystallization

In order to investigate the nucleation and growth of after-forging static recrystallization of low-pressure rotor steel 26Cr2Ni4MoV, the thermo-torsion experiment was conducted at 900°C,1000°C and 1100°C, respectively. The outer deformation of the used specimens was 0.21. The specimens were kept under a certain temperature for different periods. Results show that the recrystallization grain grew slowly at 900°C and the grain size became even after 30 minutes. The sizes of most grains were almost constant and only several grains grew bigger after 60 minutes. When the specimens were kept at 1000°C and 1100°C for one minute, static recrystallization was completed and the grain size was even. The said research could provide theoretical base for the controlled forging and after-forging heat treatment.

scholarly journals Improvement of Rigidity of Super Invar Cast Steel via Austenite Recrystallization Induced by Martensitic Reversion

2020 ◽  
Vol 60 (11) ◽  
pp. 2609-2614 ◽  
Author(s):  
Naoki Sakaguchi ◽  
Kotaro Ona ◽  
Rui Bao ◽  
Nobuo Nakada
Keyword(s):  
Cast Steel ◽  
Austenite Recrystallization

scholarly journals Improvement of Rigidity of Super Invar Cast Steel via Austenite Recrystallization Induced by Martensitic Reversion

2019 ◽  
Vol 105 (6) ◽  
pp. 629-635 ◽  
Author(s):  
Naoki Sakaguchi ◽  
Kotaro Ona ◽  
Rui Bao ◽  
Nobuo Nakada
Keyword(s):  
Cast Steel ◽  
Austenite Recrystallization
Sign in / Sign up

Export Citation Format

Share Document