ANALYTICAL RESEARCH METHODS OF HOT DEFORMATION OF METALS

Abstract

Hot processing of metals by pressure has a number of positive qualities: the constituent parts of the metal are distributed more evenly than before processing; grain sizes decrease, which leads to improved mechanical properties; the metal becomes denser. Pressure-treated metals have a fibrous structure. The hot working process is one of the types of metal forming processes and it takes place at temperatures higher than the recrystallization temperature. During hot deformation, the metal is also strengthened (hot defamation), but it is completely removed in the process of recrystallization. With it, the plasticity of the metal is higher, and the resistance to deformation is approximately 10 times lower than during cold deformation. Most metals have a recrystallization temperature that is half or one-third of the melting temperature of the metal. Therefore, we can say that when the metal is plastically deformed above the recrystallization temperature, but below the burning point, this is a hot process of metal deformation. Elastic and then plastic deformation occur under the influence of external forces on the material. Pressure treatment of metals is possible due to their plasticity. A sign of elastic deformation is its reversibility, that is, its disappearance after removal of the load. The physical essence of elastic deformation is explained by the slight relative displacement of atoms in the crystal lattice, which return to their previous positions after the load is removed. There are such methods of hot processing as: hot rolling, hot forging, hot stamping, hot drawing.