Second phase structure analysis and wear behavior of the ultra-high manganese steel

The high manganese steel is widely used in wear-resisting parts of the cone crusher, such as the grinding mill wall and crushing wall. In this work, the microstructure and wear resistance of an ultra-high manganese steel (Mn18Cr2Mo) were analyzed by electron diffraction and high-resolution transmission electron microscope (HRTEM) observation and impact abrasive wear test. The results show that there are spherical or block Mo₂C and strip-like (Fe, Cr)₃C phases in Mn18Cr2Mo manganese steel. The orientation of the Mo₂C phase and the austenite matrix are [001]_austenite//$\left[10\overline{1}\right]$ _Mo2C, (020)_austenite//(020)_Mo2C, $\left(\overline{2}00\right)$ _austenite//(202)_Mo2C and $\left(\overline{2}20\right)$ _austenite//(242)_Mo2C. The that of the (Fe, Cr)₃C phase and the austenite matrix are [011]_austenite//$\left[12\overline{1}\right]$ _{(Fe, Cr)3C} and $\left(11\overline{1}\right)$ _austenite//(210)_{(Fe, Cr)3C}. Besides, $\left(\overline{1}1\overline{1}\right)$ _austenite is approximately parallel to $\left(1\overline{1}3\right)$ _{(Fe, Cr)3C}. The interface relation of (002)_austenite is approximately parallel to $\left(\overline{1}\overline{2}3\right)$ _{(Fe, Cr)3C}. Owing to high density dislocations, deformation bands, microcrystal and non-crystalline, the wear resistance of the Mn18Cr2Mo manganese steel is 1.83 times that of the Mn13 manganese steel under the impact abrasive wear test. (paper)