Transformation Behavior of Supercooled Austenite during Hot Deformation of Plain Medium Carbon Steel within (γ+α) 2-Phase Field at a Low Strain Rate

2007 ◽  
Vol 539-543 ◽  
pp. 4626-4631 ◽  
Author(s):  
K.H. Kim ◽  
J.H. Chung ◽  
Joong Kuen Park
Keyword(s):  
Carbon Steel ◽  
Strain Rate ◽  
Phase Field ◽  
Hot Deformation ◽  
Medium Carbon Steel ◽  
Supercooled Austenite ◽  
Transformation Behavior ◽  
Medium Carbon ◽  
Low Strain Rate

Development of Constitutive Relationships Using Compression Testing of a Medium Carbon Steel

1992 ◽  
Vol 114 (1) ◽  
pp. 116-123 ◽  
Author(s):  
K. P. Rao ◽  
E. B. Hawbolt
Keyword(s):  
Flow Stress ◽  
Carbon Steel ◽  
Strain Rate ◽  
Hot Deformation ◽  
Activation Parameters ◽  
Medium Carbon Steel ◽  
Power Relationship ◽  
Process Variables ◽  
Element Analysis ◽  
Medium Carbon

Empirical or semi-empirical stress-strain relationships are of limited applicability because (i) they require a large number of constants to represent the effect of process variables, (ii) they are not able to adequately describe the typical hot deformation characteristics i.e., strain hardening at lower strains and steady state flow stress at higher strains, and (iii) they are not able to provide reliable extrapolation. In the present study, flow curves for hot deformation of a medium carbon steel in compression were obtained using a computer controlled thermo-mechanical simulator. The flow stress data were analyzed using three Arrhenius-type equations, each representing the flow stress in terms of strain rate and temperature at different strain levels. It was found that the hyperbolic-sine equation represented the data very well; each of the different activation parameters of this equation varied systematically with strain, and could be satisfactorily described using a power relationship. Using these proposed relationships the flow stress can be described in terms of the process variables—strain, strain rate and temperature—in an explicit fashion of use in finite-element analysis of hot deformation processes.

Modeling of AGS and recrystallized fraction of microalloyed medium carbon steel during hot deformation

2003 ◽  
Vol 355 (1-2) ◽  
pp. 384-393 ◽  
Author(s):  
Sung-Il Kim ◽  
Youngseog Lee ◽  
Duk-Lak Lee ◽  
Yeon-Chul Yoo
Keyword(s):  
Carbon Steel ◽  
Hot Deformation ◽  
Medium Carbon Steel ◽  
Medium Carbon

Experimentally Based Study on the Effect of Initial Grain Size for Characterization of the Grain Coarsening Phenomenon During Hot Rolling of a Medium Carbon Steel

1999 ◽  
Vol 122 (1) ◽  
pp. 109-116 ◽  
Author(s):  
Yutaka Neishi ◽  
Masayoshi Akiyama ◽  
Kouichi Kuroda
Keyword(s):  
Grain Size ◽  
Carbon Steel ◽  
Hot Rolling ◽  
Hot Deformation ◽  
Medium Carbon Steel ◽  
Grain Coarsening ◽  
Medium Carbon ◽  
Light Reduction ◽  
Fine Grain ◽  
New Criterion

Laboratory experiments using a hot deformation simulator were carried out to clarify the effect of initial grain size on the grain coarsening phenomenon in hot metal working with light reduction. As an example of medium carbon steel, AISI1045 was adopted and specimens of various grain sizes were prepared by changing the thermo-mechanical histories. They were subjected to a hot deformation testing by the simulator. The threshold grain size to cause the grain coarsening phenomenon was then determined and a criterion was presented to ensure a fine grain after hot rolling. The validity of the new criterion was checked through hot rolling of bars by a prototype mill in a laboratory. [S1087-1357(00)00801-7]

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