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《Journal of Chinese Electron Microscopy Society》 2013-06
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EBSD investigation for influences of austenitization time and cooling rate on microstructure in a ultrahigh carbon steel

LI Jun-jie;ZHANG Cheng-lu;GODFREY Andrew;LIU Wei;Key Laboratory of Advanced Materials,School of Materials Science and Engineering,Tsinghua University;  
Ultrahigh carbon steel becomes a growing scientific topic due to its potential for the application in a stronger cold drawn pearlitic steel wire. The prior austenite grain and nodule size are very important microstructure parameters for mechanical properties of pearlite steel. EBSD technique was employed to investigate the influences of austenitization time and cooling rate on the microstructure in a ultrahigh carbon steel. Experimental results show that the longer austenitization time at 1 050 ℃ increases the prior austenite grain size obviously and coarsening the pearlite nodule size slightly. The higher cooling rate decreases the pearlite nodule size dramatically. EBSD reconstruction method was compared with thermal etching method and found to be a better way for prior austenite grain size determination. For the pearlite nodule size measurement with EBSD,the manual intercept method can provide a reliable result than the Channel 5 automatic intercept method.
【CateGory Index】: TG142.11
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