Features of the distribution of non-metallic inclusions during electroslag surfacing with a high sulfur content

Author:

Parahnevich Ye.M.ORCID,Ivakhnenko Ye.I.ORCID,Petrusha Yu.P.ORCID,Kudin V.V.ORCID,Vodennikova O.S.ORCID

Abstract

Today, the question of the quality of parts is quite acute in mechanical engineering. As a rule, most parts are made from castings obtained by various methods. The main task facing the foundry industry in our country is to significantly improve the overall quality of castings, which is expressed in reducing the thickness of the walls, reducing the allowances for mechanical processing and for pouring and feeding systems while maintaining the necessary operational properties of the products. The final result of this work should be to provide the increased needs of mechanical engineering with the required number of cast blanks without a significant increase in the total production of castings by mass. The high operational characteristics of castings depend significantly on the purity of the alloys in terms of the content of harmful impurities and non-metallic inclusions. Sulfur is a very harmful impurity for steel, which, even in small amounts, significantly reduces its mechanical properties. This is especially relevant for parts that work in difficult working conditions (variable loads, high temperature, etc.). This article presents the results of the study of the distribution of non-metallic inclusions and sulfur in the fusion zone, the transition zone and the base metal during electroslag welding of chemically heterogeneous steels with a high sulfur content. It is shown that the amount of sulfur in the metal, even at high concentrations, does not affect the purity of the fusion zone in terms of the content of non-metallic inclusions. Intensive cleaning of the fusion zone and the first portions of the deposited metal occurs due to the large reaction surface with the highly active liquid fluoride flux and the high temperature of the slag bath. As a result of these processes, non-metallic inclusions are crushed, their number decreases and they are evenly distributed throughout the volume of the metal. Accordingly, non-metallic inclusions in the fusion zone have a favorable globular shape, they are small in size and evenly distributed in the volume of the metal, which helps to increase the level of mechanical properties of steels, because their size does not exceed the so-called “critical” sizes of inclusions.

Publisher

National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka) (Publications)

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