Study of the Low-Carbon Steel Plasticity Life During Deformation with Intermediate Heat Treatment

Cold plastic deformation of metals leads to work hardening of the material, which increases its hardness, raises the tensile strength, and reduces significantly its plasticity and plastic viscosity.To expand the technological capabilities of cold plastic deformation of metals, such processes as wire production by drawing through multiple passes, gradually reducing the wire diameter, can utilize deformation in several stages with intermediate heat treatments (annealing).These treatments allow for recrystallization and healing of microdefects generated during the previous deformation stage.This study examines the recovery of plasticity after cold plastic deformation in two passes of low-carbon steel 08, with heating of the deformed work piece after the first pass to temperatures above the recrystallization temperature for different types of deformation.Based on the research results, a graph of the relationship between the degree of deformation and the stress-state indicator for different deformation types is constructed.A plasticity diagram for steel 08 is plotted for both the initial state and the state after intermediate heat treatment under the conditions of annealing at 690°C for one hour.Samples for compression, tension, torsion, and combined tension and torsion are prepared to implement various types of deformation.A graph is plotted showing the relationship between the utilized plasticity resource at the second deformation stage and the plasticity resource used at the first deformation stage.