Precipitation of Carbides in Early Aging Stages and Their Crystallographic Orientations in Hadfield Steel Mn13
The methods of transmission electron microscopy (TEM) and electron diffraction are used to study the carbides precipitated in Hadfield steel Mn13 during 2-h aging at 475°C. It is shown that carbides of types (Fe, Mn, Cr)23C6 and mixed (Fe, Mn, Cr)7C3 + (Fe, Mn, Cr)3C precipitate simultaneously over austenite grain boundaries. The data on precipitation of M23C- and M7C3-type carbides in a Hadfield steel after water quenching and aging are pioneer ones. Strict orientation relations of the M23C6 carbides and of the austenite matrix are determined.
Key wordsmicrostructure crystal structure aging carbides orientation relations
The authors are grateful to researcher Liu Zhiquan and Dr. Gao Shuang of the Institute of Metal Research of the Chinese Academy of Sciences for the valuable guidance and assistance in the work.
The study has been supported by the Program for Liaoning Excellent Talents of the University within Project No. LR2012014, the Technology Promotion Program of the Ministry of Railway of China within Project No. 2012G011-D, and the Science and Technology Project of Dalian within Project No. 2013A16GX119.
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