Abstract: The relationship between wear resistance and transformation induced martensite (α phase), dislocation strengthening of austenitic medium manganese steels under non-severe impact loading conditions had been studied by means of TEM, X-ray diffraction, laboratory wear test and worksites test. The results indicate that for medium manganese steels with lower austenitic stability, the formation of transformation induced martensite and the interaction of dislocations with it can increase the work hardening ability and the wear resistance; while the increase of work hardening and the wear resistance of medium manganese steels with higher austenitic stability is the result of the interaction of the solute atoms and the second phase hard particles. Therefore, the effective way of increasing the work hardening ability and the wear resistance of austenitic medium manganese steels is to decrease the C and Mn contents and to form a large amount of dispersed fine hard particles, or to increase the concentration of solute atoms.

Key words: 耐磨性, 位错, 形变诱发马氏, 中锰钢