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| Microstructure Characteristics of Dual Phase Steel With Different Martensite Volume Fraction |
| KUANG Shuang,QI Xiu-mei,WEI Dong,LIU Guang-ming |
| Shougang Research Institute of Technology, Beijing 100043, China |
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Abstract The microstructure characteristics of dual phase steels with different martensite volume fraction (MVF) were investigated by optical microscope. The results observed show that martensite shape is island or granular in the case of low MVF. With the increase of MVF, the optical visible lath martensite appears in the microstructure, but the granular martensite islands decrease. When further increasing the MVF, the lath martensite becomes the dominant phase, whereas the granular martensite islands have almost disappeared. Combined with thermodynamic analysis, the reduction of C and Mn contents in martensite due to the increase of MVF is one of the possible reasons for the changing of martensite morphology.
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Received: 18 July 2011
Published: 30 October 2012
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2012, Vol. 47 
