Abstract
The abrasion wear of the austenitic manganese steels with 12% Mn and 20% Mn was evaluated via jaw crusher tests. The abrasive mass (i.e. gravel) used per test was 100 kg and 14.3 mm of mean sized particles. The wear characterization was carried out with the evaluation of mass loss, hardness profile, worn surface roughness, and wear micromechanisms. Additionally, the subsurface's microstructure was analysed by a Focused Ion Beam (FIB). The stationary and movable jaws presented differences in mass loss and wear micromechanisms. The stationary jaw has higher wear than the movable one. These results are related to the micromechanism of microcutting and microploughing to the stationary jaw and the micro-indentation to the movable jaw. For the relative wear of the jaws' materials, there was a significant difference for the values of stationary jaw conditions, resulting in higher wear resistance for the high manganese alloy applied in this condition. FIB results show that the wear promotes the formation of ultrafine grains and deformation twins in the subsurface layer.
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