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《Materials for Mechanical Engineering》 2015-04
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Effects of Cooling Rate and Vanadium on δ→γ Phase Transformation in Low Carbon Steel

TIAN Gen-qi;WANG Xiu-fang;FANG Yuan;SHAN Ai-dang;YU Yan;WANG Cheng-quan;YANG Xiao-ping;School of Materials Science and Engineering,Shanghai Jiaotong University;Baosteel Research Institute,Baoshan Iron & Steel Co.,Ltd.;  
The phase transformation of delta-ferrite to austenite(δ→γ)in low carbon steel and vanadium micro-alloyed low carbon steel was in-situ observed utilizing confocal scanning laser microscope at three different cooling rates(0.17,1,10 ℃·s-1).The characteristics ofδ→γphase transformation in vanadium micro-alloyed low carbon steel at various cooling rates and the effects of cooling rate and vanadium were analyzed.The results show that the undercooling rose and the starting and ending temperatures dropped with the increase of cooling rate.At a low cooling rate,theγphase nucleated prior at the triple points ofδ-Fe,then atδ-Fe grain boundaries,finally nucleated in grains.At a high cooling rate,γphase nucleated prior at the triple points ofδ-Fe andδ-Fe grain boundaries almost simultaneously,then nucleated in grains quickly.The element vanadium can inhibit the movement of the triple points ofδ-Fe,expand temperature range and prolong duration ofδ→γphase transformation.
【Fund】: 国家自然科学基金重点资助项目(51034011)
【CateGory Index】: TG142.31
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