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《Materials Review》 2018-S1
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The Effect of Hot-rolling in Two-phase Zone on Microstructures and Mechanical Properties of 20 Steel

CHEN Xiaoli;YANG Xiong;YUAN Weiwei;SUN Xiaofeng;Department of Mechanical and Electrical Engineering,Chongqing Aerospace Polytechnic;Jilin Chongtong Chengfei New Material Co.LTD;Beijing Oriental Optoelectronic Technology Co.LTD(Chengdu);  
This paper presents the results of investigations of the microstructure and mechanical properties of 20 steel by Gleeble-3500 thermal simulation testing machine after different deformation conditions.With the deformation temperature range of750—850 ℃ and the strain rate range of 1—10 s-1,the experiment was performed inα+γtwo-phase zone.The true stress-strain curves under different deformation conditions were obtained,and the microstructure of 20 steel was studied by the optical microscope(OM)and field emission scanning electron microscopy(FE-SEM).It was noticed that at a constant temperature,the flow stress increased with increasing strain rate,and the flow stress decreased with the increase of deformation temperature at a constant strain rate,but an abnormal increase on flow stress was observed at 820—850 ℃.From the point of view of the phase transition,higher temperature led to a lower volume fraction ofα-phase which is an important factor to reduce the intensity of the microstructure of 20 steel.It could be concluded that temperature was a key factor to determine the mechanical properties in the temperature range of750—820 ℃,and(α+γ)phase transition worked in 820—850 ℃.
【CateGory Index】: TG142.1;TG335.11
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