Abstract
This work aims at the suitability of electroslag process on production of high technological steels such as Maraging steel, modified high speed tool steel (niobium, high nitrogen, and free nitrogen) has been investigated. The experimental results show that high recovery of alloying elements during electroslag remelting of such steels especially high nitrogen tool steel. The previous results are attributed to the slag used in electroslag protect the molten metal from atmospheric oxygen. Also higher recovery of alloying elements during remelting high nitrogen high speed tool steel are due to partial dissolution of nitrides during remelting of such steel which increase nitrogen content above the molten slag which decrease the partial pressure of oxygen leads to protection of molten metal from further oxidation. Also, the results show that, produced ingots are free from internal pipes, porosity and other surface defects. Microstructure obtained for remelted steels is very fine and well distributed for all steel under investigation. In the case of electroslag remelted Maraging steels lower non-metallic inclusions with very fine inclusions and redistribution retained austenite with very fine structure leads to increasing all tensile properties of investigated steels. In the case of high speed tool steels, also the structure is very fine, well distributed, densely and short carbides with lower non-metallic inclusions contents. High cooling rate accompanying with electroslag process has a great effect on type, morphology and content of carbides precipitated in both nitrogen and niobium modified tool steels.
Highlights
Maraging steels were originally developed at the Inco R and D Center [1]
The recovery of alloying elements in all ingots produced by electroslag remelting (ESR) process using any of the three calcium fluoride slags are given in Table 7 and Table 8
For high speed tool steels, solidification parameters in electroslag remelting process change the amount of carbides precipitated and the morphology and the chemical composition of this carbides
Summary
Maraging steels were originally developed at the Inco R and D Center [1]. They were produced by American. The properties of Maraging steel and high speed tool steels containing niobium and nitrogen depend to a large extent on the production and refining technology which affect the recovery and homogeneity of alloying elements as well as the cleanness of the produced steel [8]. The contamination of these steels with non-metallic inclusion (NMI), the homogeneity of matrix composition and zone segregation of alloying elements has great influence of their properties. This work aims at study the suitability of electroslag process on production different advanced material such as Maraging steel, niobium containing, high nitrogen and free nitrogen high speed tool steels
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