Hydrogen influence of steel product quality
DOI:
https://doi.org/10.31548/machenergy2019.02.013Keywords:
hydrogen, steel, flocs, stress, heat treatment, temperature, heating, cooling, exposure.Abstract
In order to improve the quality of steel products, patterns of hydrogen dissolution in molten iron-carbon alloys and isolation during their crystallization and phase transformations are analyzed. The mechanism of hydrogen accumulation on the defects of the crystal structure of metals and alloys, the formation and propagation of cracks under the action of normal stress with the participation of a hydrogen cluster and dislocations, as well as the directions of preventing the negative effect of hydrogen are given. It has been established that the main reason for the formation of flocs is the presence of increased amounts of hydrogen in steel in tensile stress zones that occur during steel structural transformations, plastic deformation, uneven cooling, stress concentration sites, lattice defects, grain boundaries, non-metallic inclusions and segregation non homogeneities. Based on the established regularities, the modes of cooling and holding of blanks from carbon and low-alloyed steels after hot working by pressure, as well as preliminary and final anti-flocking heat treatment of steel blanks containing hydrogen, which allow to obtain high-quality steel products without flocs, are developed.
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