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Precipitation behavior of carbides in a high manganese austenitic steel for magnetic liner

JIN Yun-xue;SONG Yan-ping;College of Material Science and Engineering,Jiangsu University of Science and Technology;  
A new ultrahigh hardness austenite steel for magnetic lining was developed by addition of a moderate amount of carbide forming elements to commercial high manganese austenitic steel. Precipitation behavior of carbides in the high manganese austenitic steel after heat treatment was analyzed by means of transmission electron microscopy,scanning electron microscopy and XRD. The results show that Cr23C6phases uniformly precipitate from austenite after solution and aging treatment,and the amount of M23C6carbides reaches the maximum value at the aging temperature of 675 ℃. After then the M23C6phases start to grow up and gather. Large number of dispersed VC particles with tens of nanometers precipitate in the steel during aging treatment,which exhibit coherent interface with matrix,and these precipitated VC particles significantly enhance the hardness of the material.
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