Serrated Flow and Dynamic Strain Aging in Fe-Mn-C TWIP Steel

2017 ◽  
Vol 49 (1) ◽  
pp. 147-161 ◽  
Author(s):  
Peng Lan ◽  
Jiaquan Zhang
2017 ◽  
Vol 97 (6) ◽  
pp. 235-240 ◽  
Author(s):  
W. H. Wang ◽  
D. Wu ◽  
S. S. Shah ◽  
J. H. Ni ◽  
R. S. Chen ◽  
...  

2013 ◽  
Vol 652-654 ◽  
pp. 1937-1941 ◽  
Author(s):  
Si Qian Zhang ◽  
Liang Mao ◽  
Li Jia Chen

Serrated flow has been observed in AZ81 alloy during tensile deformation. The observed static strain ageing effect and negative strain rate sensitivity suggest that the serrated flow is due to interaction between dislocations and solute atoms, know as dynamic strain ageing (DSA). The Portevin-Le Chatelier effect is observed at temperatures between 150oC~200oC and 125oC~200oC. In the microstructure of deformed samples dislocations and twins is observed. It is suggested that the occurrence of the dynamic strain aging is associated with interactions between solute atoms and dislocations.


2015 ◽  
Vol 633 ◽  
pp. 136-143 ◽  
Author(s):  
J.G. Kim ◽  
S. Hong ◽  
N. Anjabin ◽  
B.H. Park ◽  
S.K. Kim ◽  
...  

1986 ◽  
Vol 1 (1) ◽  
pp. 124-129 ◽  
Author(s):  
K. C. Goretta ◽  
J. L. Routbort ◽  
T. A. Bloom

The effects of aging on the upper yield stress τup and serrated flow have been studied in MnO single crystals at 900 °C for oxygen partial pressures ρO2 of 10−11 and 10−7 Pa. Aging initially increases τup as a consequence of segregation of aliovalent impurities to dislocations for both ρO2 values. For long aging times and ρO2 = 10-11 Pa, serrated flow accompanied by solute softening is observed. The data fit predictions of a Portevin-Le Chatelier model for serrations, but with impurity atmospheres causing softening instead of hardening. This is believed to result from changes in local defect equilibria caused by segregation of impurities with valences greater than two to dislocations.


2010 ◽  
Vol 654-656 ◽  
pp. 270-273 ◽  
Author(s):  
Jin Kyung Kim ◽  
Yuri Estrin ◽  
Hossein Beladi ◽  
Sung Kyu Kim ◽  
Kwang Geun Chin ◽  
...  

High Mn steels demonstrate an exceptional combination of high strength and ductility due to their high work hardening rate during deformation. The microstructure evolution and work hardening behavior of Fe18Mn0.6C1.5Al TWIP steel in uni-axial tension were examined. The purpose of this study was to determine the contribution of all the relevant deformation mechanism : slip, twinning and dynamic strain aging. Constitutive modeling was carried out based on the Kubin-Estrin model, in which the densities of mobile and forest dislocations are coupled in order to account for the continuous immobilization of mobile dislocations during straining. These coupled dislocation densities were also used for simulating the contribution of dynamic strain aging on the flow stress. The model was modified to include the effect of twinning.


2011 ◽  
Vol 299-300 ◽  
pp. 90-93
Author(s):  
Li Jia Chen ◽  
Jia Li ◽  
Feng Li ◽  
Xin Wang

Cyclic deformation for two magnesium alloys AZ91 and AM50 with different processing status has been performed under total strain amplitude control mode and at room temperature. A serrated flow can be observed in both tensile and compressive directions of the stress-strain hysteresis loop for as-extruded AZ91 and AM50 magnesium alloys. It means that the so-called dynamic strain aging occurs during cyclic deformation. In addition, the dynamic strain aging phenomenon can also be observed in two extruded magnesium alloys subjected to aging treatment as well as the AZ91 alloy subjected to solution treatment. However, the dynamic strain aging seems not to take place in the extruded AM50 alloy subjected to solution treatment because there exists no significant serrated flow behavior in either compressive or tensile direction of the stress-strain hysteresis loop. It is suggested that the occurrence of the dynamic strain aging is associated with collective behavior of many mobile dislocations as well as interactions between solute atoms and dislocations.


2021 ◽  
Vol 172 ◽  
pp. 110828
Author(s):  
Ankang Huang ◽  
Zhigang Wang ◽  
Xin Liu ◽  
Qiangqiang Yuan ◽  
Jieyun Ye ◽  
...  

Sadhana ◽  
2020 ◽  
Vol 45 (1) ◽  
Author(s):  
Siddhartha Patra ◽  
Sankar Dhar ◽  
Sanjib Kumar Acharyya

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