NDLI: Alloying of steel with a superequilibrium amount of nitrogen from a gaseous atmosphere in the process of electroslag remelting

Content Provider	Springer Nature Link
Author	Vytvyts’kyi, V. I. Tkachov, V. I. Hrebenyuk, S. O.
Copyright Year	2000
Abstract	We designed the structure of and manufactured an installation for electroslag remelting under elevated pressure in a gaseous atmosphere, which enables one to obtain ingots 10 kg in weight under a pressure of up to 10 MPa.We showed the fundamental possibility of alloying steel with nitrogen from a gaseous phase in the process of electroslag remelting. For the remelting of 20KhN3A steel under a nitrogen pressure of 5 MPa, we obtained a sevenfold increase in the concentration of nitrogen (from 0.0166 to 0.1081 mass %). For alloying with silicon nitride, hardness remains on the level of the hardness of the parent metal (HRC 27-32). For gaseous alloying with nitrogen, hardness increases to HRC 47–50.Gaseous alloying has the following advantages: (a) the absence of a change in the chemical composition of metal due to admixtures contained in the nitrated alloying composition; (b) a considerable reduction in the cost of nitrous metal due to the elimination of nitrated ferroalloys (ferromanganese, ferrochrome, ferrosilicon, etc.) from the technological process.In the case of alloying of 20KhN3A steel by using a superequilibrium content of nitrogen, structural changes manifest themselves in the formation of white interlayers along grain boundaries, increase in the thickness of grain boundaries, and change in the density, morphology, and mutual orientation of rejections of the needle-type phase. We recorded a decrease in the lattice parameter and the appearance of the line of austenite.The addition of activation admixtures to fluxes leads to a sharp increase in the ability of metal to adsorb nitrogen in the process of electroslag remelting. At a pressure of gas-like nitrogen of 0.1 MPa, its concentration in metal increases by a factor of 4.5. This means that, in some cases, nitration is possible even without the use of expensive high-pressure equipment.
Starting Page	454
Ending Page	457
Page Count	4
File Format	PDF
ISSN	1068820X
Journal	Materials Science
Volume Number	36
Issue Number	3
e-ISSN	1573885X
Language	English
Publisher	Springer US
Publisher Date	2000-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Structural Materials Structural Mechanics
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science Mechanical Engineering

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