Platov South-Russian State Polytechnic University (NPI), Novocherkassk, Russia
S. N. Sergeenko, Cand. Eng., Associate Prof., e-mail: sergeenko@gmail.com

The regularities of the influence of the duration of the mechanical activation of the charge and the pressure of cold compaction on the hardness of steel 110G13 consolidated during sintering based on a mixture of Fe–FeMn–C powders processed in a planetary mill are established. With an increase in the duration of mechanical activation of the powder charge to 1.8 h, dispersion of charge particles, an increase in the porosity of cold-compacted moldings, activation of the sintering process and an increase in the hardness HV of sintered steel 110G13 are observed for the investigated pressure range of cold compaction of 500–875 MPa. A linear relationship between the porosity of sintered powder steel 110G13 and molding at a given pressure of cold compaction for the investigated duration of the charge mechanical activation has been revealed. The values of the consolidation coefficient are calculated, which characterize the degree of reduction in the porosity of the sintered workpiece with a decrease in the porosity of the cold-compacted molding. A nonlinear regression equation of the second order is constructed for the influence of the duration of mechanical activation on the values of the consolidation coefficient. Based on the results of X-ray phase analysis of consolidated powder steel 110G13, it was shown that when using a charge obtained with an increased duration of mechanical activation of 2.1 h, a Mn1.8Fe1.2C carbide phase is formed in the structure of the sintered material, which provides an increase in hardness. When using a charge processed for 1.05 hours, providing the maximum relative density, an increased hardness of 416 HV of consolidated steel 110G13 is observed. In the transition from dispersion to agglomeration (1.8 h), the maximum values of the consolidation coefficient are provided in the process of sintering powder steel 110G13. On the basis of the constructed sigmoidal dependence, the critical values of the cold compaction pressure and the duration of the charge mechanical activation are determined, which ensure the transition to increased hardness of powder steel 110G13.

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