STRUCTURE AND PHASE COMPOSITION OF THE SURFACE LAYER OF WIRE FROM CORROSION-RESISTANT STEELS AFTER QUENCHING IN BELL FURNACES

摘要

1. The physicochemical, phase, and structural transformations in the surface layer of the wire heated in a bell furnace are caused by decomposition and interaction between the remnants of carbon-bearing lubricants and surface-active substances used in drawing and the metal in the space of the furnace. This is accompanied by carbonization, oxidation, and chromium depletion of the surface layer of the wire.2. When the chromium content in the surface layer is reduced to less than 13 percent, dross appears in subsequent storage of the coiled wire under atmospheric conditions. The formed composition appears to consist of alloys of different classes, i.e., the internal layer of the base metal and the surface layer of a less alloyed alloy. Such a composition loses a considerable part of its ductility, and cracks appear in it upon further deformation.