Phase and crystal structure of two kinds of fine aluminium containing inclusions in Mn13 high manganese steel

Abstract

The phase and crystal structure of two kinds of white and bright phases, polygon and rectangle respectively, under a transmission electron microscope in Mn13 high carbon high manganese steel were analysed by energy dispersive spectrometer and selected area electron diffraction pattern calibration method. The results show that the polygon white and bright phase is Al₂O₃ with a size <500 nm and an orthorhombic crystal structure, where the reports about them have not yet been found; the rectangle white and bright phase is Al₄C₃ with a size 200–350 nm×55–130 nm and a hexagonal crystal structure, which is not reported in the previous studies.

Keywords:

• Phase
• Crystal structure
• TEM
• Aluminium containing inclusion

Acknowledgements

The authors are grateful to Z. Liu and Dr S. Gao of Institute of Metal Research, Chinese Academy of Sciences, for the valuable guidance and assistance in this work. This study was supported by the Program for Liaoning Excellent Talents in University (project no. LR2012014), Technology Promotion Program from the Ministry of Railway of China (project no. 2012G011-D) and Science and Technology Project of Dalian (project no. 2013A16GX119).