Abstract
<p class="1Body">Considered the nature of changes in the morphology of carbides of the unalloyed high-carbon alloys type Damascus steel depending on the degree of supercooling of the melt, heat treatment and plastic deformation. It is shown that iron-carbon alloy with carbon content as in white cast iron at high degrees of supercooling can crystallize as a high-carbon steel. Considered three hypotheses for the formation of the eutectic carbides in pure iron-carbon alloys. The first hypothesis is based on the thermal process of dividing plates of secondary cementite or of ledeburite on isolated single grain. The second hypothesis is based on the deformation process of crushing of secondary cementite or of ledeburite into separate fragments (the traditional view on the formation of eutectic carbides). The third hypothesis is based on the transformation of metastable ledeburite in a stable phase of eutectic carbide prismatic morphology. Found that some types of wootz, which carbon content as in of white cast irons not is contain its structure of ledeburite. It is shown that the structure of consists entirely of the eutectic carbides prismatic morphology.</p>
Highlights
Modern tool steels are produced by complications of chemical composition and heat treatment
In this article we are interested in the question of how the degree of supercooling of the melt, temperature regimes of heat treatment and the degree of plastic deformation of the ingot affect the morphology of the excess carbides in pure iron-carbon alloys containing 2,25% carbon
We demonstrated that some types of Damascus steel, which carbon content as in of white cast irons not is contain its structure of ledeburite
Summary
Modern tool steels are produced by complications of chemical composition and heat treatment. The highest achievement in the field of cutting tools include are high-speed steels and die steels as ledeburitic steels. Heat treatment of these steels is a complex technological process, including multi-stage heating and cooling and cold treatment. The aim of this work is to develop an alternative steels ledeburite without expensive alloying elements and the creation of resource-saving technologies of producing cutting tools of high elasticity under dynamic loads. Such conditions are responsible unalloyed high-carbon alloys on the carbon content, in the field of white cast irons. Cutting properties and elasticity of these steels will depend on morphological features of excess carbide phase and ability of the matrix pearlite to take the load
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