scholarly journals Effect of Continuous Annealing Thermal Pattern on Strength and Ductility of Cold Rolled Dual Phase Steel

1988 ◽  
Vol 74 (2) ◽  
pp. 326-333 ◽  
Author(s):  
Hidenori SHIRASAWA ◽  
Yoshiki TANAKA ◽  
Kazuhiko KORIDA
Keyword(s):  
Dual Phase Steel ◽  
Continuous Annealing ◽  
Dual Phase ◽  
Thermal Pattern ◽  
Cold Rolled ◽  
Strength And Ductility

Effect of Intercritical Annealing Temperature on Development of Cold Rolled Dual Phase Steel from Q345 Steel

2013 ◽  
Vol 313-314 ◽  
pp. 693-696
Author(s):  
Ji Yuan Liu ◽  
Fu Xian Zhu ◽  
Shi Cheng Ma
Keyword(s):  
Dual Phase Steel ◽  
Annealing Temperature ◽  
Simulation Experiment ◽  
Intercritical Annealing ◽  
Continuous Annealing ◽  
Dual Phase ◽  
Automotive Applications ◽  
Treatment Procedure ◽  
Annealing Temperatures ◽  
Cold Rolled

Cold rolled dual phase steel was developed from Q345 steel by heat treatment procedure for automotive applications. The ultimate tensile strength was improved about 100MPa higher than the traditional cold-rolled Q345 steel in the continuous annealing simulation experiment. The microstructure presented varied characteristics in different intercritical annealing temperatures; mechanical properties were changed correspondingly as well. The chief discussions are focus on the recrystallization, hardenability of austenite and martensite transformation in the experiment.

Effect of Continuous Annealing Parameters on the Microstructure and Magnetic Property of Cold Rolled Dual Phase Steel

2012 ◽  
Vol 476-478 ◽  
pp. 241-247 ◽  
Author(s):  
Li Gao ◽  
Qiu Hong Song ◽  
Jun Ting Yuan
Keyword(s):  
Magnetic Properties ◽  
Magnetic Property ◽  
Dual Phase Steel ◽  
Volume Fraction ◽  
Annealing Process ◽  
Continuous Annealing ◽  
Dual Phase ◽  
Quenching Temperature ◽  
Dp Steel ◽  
Cold Rolled

The effect of continuous annealing parameters on the microstructure and magnetic property of cold rolled dual phase steel (DP steel) are investigated. Correlations of microstructure, magnetic properties and continuous annealing parameters are revealed. The mechanism of the magnetic property varying with continuous annealing process is also discussed. The results show that recrystallization is almost completed when heating to 740°C. For the DP steel soaked in the range of 770°C-830°C and quenched in different temperature, the TEM results indicate its microstructure mainly consists of the ferrite and martensite phase. The martensite volume fraction increases gradually with increasing the soaking and quenching temperature. It is found that magnetic properties of dual phase steel are very sensitive to continuous annealing process. With rising soaking and quenching temperature, the coercivity and hysteresis loss increase obviously, whereas the maximum permeability and the remanent induction tend to decrease.

scholarly journals Microstructure Evolution and Mechanical Properties of C-Mn Cold Rolled Dual Phase Steel after Continuous Annealing Process in Laboratory Conditions

2014 ◽  
Vol 59 (2) ◽  
pp. 821-824 ◽  
Author(s):  
M. Šebek ◽  
P. Horňak ◽  
P. Zimovčák ◽  
S. Longauer
Keyword(s):  
Mechanical Properties ◽  
Microstructure Evolution ◽  
Dual Phase Steel ◽  
Annealing Process ◽  
Continuous Annealing ◽  
Dual Phase ◽  
Laboratory Conditions ◽  
Cold Rolled ◽  
Intercritical Region ◽  
Evolution Of Microstructure

Abstract The article deals with the influence of annealing parameters on evolution of microstructure and mechanical properties of dual phase steel. Dual phase steel was annealed in laboratory conditions according to the three chosen cycles of annealing: into intercritical region (780°C), into austenite region (920°C) and into austenite region (920°C) by subsequently cooling into intercritical region (780°C) with the hold at the temperature of 495°C. Simulation of annealing regimes by thermo-mechanical simulator Gleeble was done. The obtained microstructure consists from three phases: ferritic matrix, martensite and martensite/ bainite grains. For the microstructure identification the TEM and nanoindentation experiments were performed.

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