Influence of a Direct Current on Macrostructure and Microstructure of Manganese-Containing Steels

Issues » Volume 39, Issue 11

O. M. Zhbanova, L. N. Saitgareyev, I. E. Skidin

State Institution of Higher Education ‘Kryvyi Rih National University’, 11 Vitaliy Matusevych Str., UA-50027 Kryvyi Rih, Ukraine

Received: 02.10.2017. Download: PDF

As shown in the article, the methods of electric-current influencing on melting during melt crystallization are more and more widely used to improve the quality of castings. Positive results of such modification are the improved processes of both the heat and mass transfer and the structure formation. As noted, the influence of electrical treatment is proved theoretically and practically only for the casting of non-ferrous metals and alloys as well as some types of cast irons. The mechanism of the physical and chemical influences of electric current on the process of crystallization in the foundry form of manganese-containing steels requires careful investigations, which must be close as possible to real conditions. In the article, the comparison of macro- and microstructures of the 110G13L and 35GL manganese-alloyed steels modified during crystallization in the foundry form by direct electric current with the structures of samples obtained by using the traditional technology is made. All the studies are carried out according to standard techniques. As determined, the modification of the smelting steels in the foundry form by direct electric current of 40 A provides an obtaining the cast products with an increased content of alloying elements in the surface layer of castings. The difference in the Mn concentration between the anode and cathode parts of the samples of the 35GL and 110G13L steel grades is 26.6% and 5.3%, respectively. As shown, the arrangement of electrodes in the foundry form influences significantly on the displacement of non-metallic inclusions. Significant influence of current on microstructure of 35GL and 110G13L alloys during their crystallization is consisted in significant changing the quantity and size of primary dendrites. Manganese carbides become more dispersed and decrease in size from 80 to 53 $\mu$m and from 254 to 90 $\mu$m, respectively. At the same time, the distance between dendrites is also decreasing. Electrical processing of the 35GL and 110G13L alloys results in the increase of their hardness on the cathode part of samples by 7% and 9%, the impact strength — by 21% and 8%, the ultimate tensile strength — by 7% and 14%, respectively.

Key words: manganese carbides, manganese-containing steels, structure, mechanical properties, electric transport, direct current.

URL: http://mfint.imp.kiev.ua/en/abstract/v39/i11/1455.html

DOI: https://doi.org/10.15407/mfint.39.11.1455

PACS: 61.72.Ff, 61.72.Qq, 61.72.S-, 62.20.fk, 62.20.Qp, 68.70.w, 81.40.Cd, 83.60.La

Citation: O. M. Zhbanova, L. N. Saitgareyev, and I. E. Skidin, Influence of a Direct Current on Macrostructure and Microstructure of Manganese-Containing Steels, Metallofiz. Noveishie Tekhnol., 39, No. 11: 1455—1467 (2017) (in Ukrainian)

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