Abstract
The microstructure and local fields of internal stresses arising in the surface layer of 0.4C-1Cr structural alloy steel (40X type) samples after machining by cutting are investigated. Before treatment, the samples were subjected to recrystallization annealing at a temperature of 600°C for 60 min. Sample processing was carried out in three modes: finishing (mode 1), sequential combination of roughing and semi-finishing (mode 2), sequential combination of roughing, semi-finishing and finishing (mode 3). With 1, 2 and 3 processing modes, chips are removed to a depth of 0.25, 1.5 and 1.75 mm, respectively. Transmission electron microscopy was used to determine the amplitude of the curvature-torsion of the crystal lattice of the forming phases, the excess density of dislocations, and the amplitude of internal stresses. It has been established that the main phase components in 40X steel after cutting are lamellar pearlite with different morphology and fragmented and unfragmented ferrite.
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