Phased Passive Fluxgate Control of Structural Changes in Low-Carbon and Low-Alloy Steels of Construction Machines

Abstract

AbstractThe initial structure of metals and alloys determines their mechanical properties. They can differ significantly in various elements of welded metal structures, as well as in the zones and sections of welded joints. Plastic deformation can occur in hazardous areas of stress concentration of elements of operated metal structures. In this work, studies were carried out on samples of low-carbon steel 08 ps and low-alloy steel 10KhSND, which were subjected to thermal cycling in the following conditions: as delivered state; as delivered + annealing at 900 °C; as delivered + cold rolling for the degree of deformation ε = 50%. The formation of a fine-grained structure during thermal cycling was monitored by a passive fluxgate method, as well as by microstructural analysis and hardness testing. The value of the stray magnetic field strength Hp was measured. As a result of the conducted studies, a relationship was established between the magnetic parameter Hp and structural changes in steels during thermal cycling.KeywordsWelded metal structuresConstruction machinesPassive fluxgate control