Abstract: Carbide formation and its morphology of high manganese steel have been further researched in the light of nonequilibrium solidification (liquid-quenching and casting).It has been found that carbide can be formed and its growth abides by the branohing cooperation growth mold.It is put forward that the carbide growth can be improved by modification treatment,the branching growth carbide can be turned into spheroidite,which is proved by the test of Si-Ca modification treatment of high manganese steel.The reason is that the content of active trace elements,surphur and oxygen,and their distribution have changed.The results will provide theoretical and practical bases for as-cast high carbon high manganese steel product development and application.

Key words: carbide growth, modification, high carbon high manganese steel