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《Journal of University of Science and Technology Beijing》 2013-02
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Influence of ultra-fast cooling on the microstructure of X70 pipeline steel

CHEN Yu-lai,ZHANG Dong-bin~,YU Wei,GUO Jin National Engineering Research Center for Advanced Rolling Technology,University of Science and Technology Beijing,Beijing 100083,China  
The effects of cooling rate and finish rolling temperature on the microstructure refinement and martensite /austenite(M/A) islands in X70 pipeline steel were studied with a Gleeble thermal-mechanical simulation machine. When the cooling rate increasing,the grain size of ferrite decreases,the volume fraction of M/A islands increases first and then decreases,but the dimensional change of M/A islands is opposite to the volume fraction.With the finish rolling temperature rising,ferrite in the steel slightly grows up and the volume fraction of M/A islands increases;but when the finish rolling temperature increases from 900 to 940℃,the volume fraction of M/A islands slightly decreases and the size of M/A islands increases.
【CateGory Index】: TG335.7
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