Thermographic investigation of the contact melting of metals. III. Binary iron systems

Abstract

The methods of differential thermal analysis, metallography, and local x-ray spectral analysis were used to study the contact melting upon heating and cooling at 80 deg/sec of binary powder mixtures of iron with C, Cr, V, Cu, Mo, W, Hf, Ta, Ti, Zr, B, Al, Si, and Nb. When systems containing intermediate phases were heated, layers of these phases formed at the interface. These processes were accompanied by exothermic effects. If phase formation took place in the solid state the effects were extended in temperature. When liquid eutectic phases appeared during heating, the exothermic effects were vigorous and proceeded in a narrow temperature range. The magnitude of the effects is determined by the difference between the exothermal effects of intermediate phase formation and the endothermal effects of eutectic melting.