THERMOGRAPHIC INVESTIGATION OF THE CONTACT MELTING OF METALS .3. BINARY IRON SYSTEMS

The methods of differential thermal analysis, metallography, and local x-ray spectral analysis were used to study the contact melting upon h eating and cooling at 80 deg/sec of binary powder mixtures of iron wit h 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 for med at the interface. These processes were accompanied by exothermic e ffects. If phase formation took place in the solid state the effects w ere extended in temperature. When liquid eutectic phases appeared duri ng heating, the exothermic effects were vigorous and proceeded in a na rrow temperature range. The magnitude of the effects is determined by the difference between the exothermal effects of intermediate phase fo rmation and the endothermal effects of eutectic melting.