Abstract
The work-hardening behaviour and the microstructure change of medium manganese steel and Hadfield steel were studied by impact abrasive wear tests, TEM and Mossbauer spectrometer. The results showed that the wear resistance of 6Mn-2Cr steel is about 1.5 times as high as that of Hadfield steel under low impact energy condition. It was dropping as the energy increased. The TEM and the Mossbauer results indicated that there were two kinds of austenites in 6Mn-2Cr steel before wearing tests. Correspondingly, two kinds of strain-induced martensites were produced while impact wearing. In addition, the weight fraction of carbon (C) and metallic alloying elements (Me) free martensites did not change with the increasing of impact energy, but that of C and metallic elements (Me) containing martensite did. The high work-hardening rate in 6Mn-2Cr steel was caused by the transformation of strain-induced martensite, the additional pressure stress caused by this transformation, the obstruction of C-Me-C-Me lattice in movement of dislocation and the dynamic strain aging.
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