Gas Extrusion Treatment of Thermally Hardened Steel and Alloys in the Mode of Deformation-Thermal Hardening

摘要

Thermally hardened alloys based on iron (50KhFA steel), titanium (VT-14), and aluminum (D16) were subjected to deformation by gas extrusion with local heating in the mode of deformation-thermal hardening with high degrees of deformation 90% or more to obtain a thin wire at the output. Gas extrusion was performed at various combinations of processing parameters–gas pressure, deformation temperature, extrusion speed. The wire deformed under various combinations of processing parameters was cooled in air and subjected to tempering or aging and a tear test. The mechanical properties obtained as a result of the tests were compared with the data on the mechanical properties of the initial undeformed alloys and heat-treated and non-heat-treated alloys. On all gas-extruded alloys, the mechanical properties exceeded the initial ones in both strength and plasticity. The combination of gas extrusion parameters (gas pressure, deformation temperature, extrusion speed) has a decisive influence on the combination of strength and ductility of alloys treated by gas extrusion.