Characteristics of modifiers

Ryabchikov, I. V.; Panov, A. G.; Kornienko, Andrei

doi:10.3103/s0967091207060113

Cited by 17 publications

(3 citation statements)

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“…There is one more important qualitative advantage of lanthanum: in the case of lanthanum, the limiting solubility in liquid CNG is unlimited, while in the case of magnesium, it is very low [10][11].…”

Section: Complex Modifiers For Spheroidization and Vermicularization mentioning

confidence: 99%

Ladle and In-mold Modification Methods for Obtaining Castings from Cast Irons with Various Graphite Morphology

Zakharchenko¹,

Shinsky²,

Baglyuk³

et al. 2019

Nauka innov.

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Introduction. In the world practice of foundry, modification has reached the status of leading direction of research and applied work to improve the technological and service properties of structural cast irons. Problem Statement. Modifying treatment of liquid iron provides for not only the creation of certain types of modifiers, but also for the development of such methods for introducing modifier into the melt, which are adaptable to the conditions of foundries and take into account the requirements for specific groups of castings. Purpose. To develop a pilot technology for the modification of electric furnace melts of cast iron in unsealed ladle with removable bowl caver and casting molds using complex reagents in the form of pressed powder briquettes and lumpy fused master alloys for the production of castings with lamellar, vermicular and spherical graphite. Materials and Methods. The following materials have been used in the research: gray cast iron, as an object of research for modifying treatment, magnesium-lanthanum-containing lumpy and briquetted powder modifiers, as well as nitrogencontaining lumpy and briquetted powder modifiers to produce cast iron with various forms of graphite, depending on the requirements for castings. Results. A pilot technology for cast irons using pressed powder nitriding briquettes to increase twice the tensile strength of structural gray cast irons (from 200 MPa to 400 MPa) without alloying and heat treatment and a ladle process for modifying molten iron melts with lanthanum-containing modifiers have been developed. The prospects for the production of nitrated iron with vermicular graphite with a sulfur content of up to 0.1% wt. by re-melting the nitrogenous metal charge and fresh and rotary cast irons and therefore with the possible minimum additional introduction of nitrogen in the furnace or in the ladle or in the mold have been substantiated. Conclusions. The pressed powder composite modifiers are recommended as the most effective ones for the mentioned modifying methods, depending on the requirements for castings. K e y w o r d s: ladles, intra-form modifying, magnesium-lanthanum-and nitrogen-containing complex modifiers.

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Section: Complex Modifiers For Spheroidization and Vermicularization mentioning

confidence: 99%

Ladle and In-mold Modification Methods for Obtaining Castings from Cast Irons with Various Graphite Morphology

Zakharchenko¹,

Shinsky²,

Baglyuk³

et al. 2019

Nauka innov.

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“…(spectrum 1). Thus, along with barium, strontium is not only involved in deoxidizing and modifying steel, but also provides protection for calcium [12]. And in this respect the most effective, apparently, strontium.…”

Section: Materials Science and Metallurgical Technologymentioning

confidence: 99%

Methods for Improving the Efficiency of Steel Modifying

Bakin

Михайлов

Golubtsov

et al. 2019

MSF

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In connection with the need to improve the quality characteristics of metal products, metallurgists are faced with the task of finding new effective methods for secondary steel processing. It is known that the use of simple, two-component materials does not significantly improve the quality of the metal. Complex modifiers with alkaline-earth elements are increasingly used for the modifying processing of steel. These modifiers allow to influence both the metal structure and the shape, phase composition and physical properties of nonmetallic inclusions. At the same time, it is known that barium and strontium practically do not dissolve in steel and are removed from the alloy in the extremely short time. The ability of barium and strontium alloys to deoxidize and desulphurize is low because of the large atomic mass of these elements. The modifying effect of alkaline-earth elements on the properties of steel is undeniable. This effect can be explained by the ability of barium and strontium to affect the magnitude of inter-phase tension in the event of contact with the phase boundary. The purpose of this work was to generalize the industrial experience of using multicomponent alloys with alkaline-earth elements for modifying of steel. Data on the effects of alloys with alkaline-earth elements on the properties of metals are given, as well as technological features of the use of complex alloys with alkaline-earth metals in steelmaking. Thus, it is noted that in conditions of large-scale steelmaking, a very important factor is the limited time in time of the modifying effect of alloys with alkaline-earth metals, which dictates the necessity of transferring the process of modification directly to casting.

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“…Researchers [12,13] believe that the effectiveness of the modification is determined, as a rule, by the phase composition, shape, and size of the structural components (phases) and their distribution in the modifier volume. In work [12], is emphasized that the introduction of fine-crystalline modifiers into the steel structure provides more uniform distribution of small phases containing chemically active elements of rare-earth metals, alkaline earth metals, Ti, etc.…”

Section: Introductionmentioning

confidence: 99%