The Paton Welding Journal, 2020, №08



2020 №08 (01)

DOI of Article 10.37434/tpwj2020.08.02

2020 №08 (03)

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The Paton Welding Journal, 2020, #8, 15-18 pages

Investigation of the methods of modifying the structure of austenitic welds and the zone of their fusion with pearlitic base metal

K.A. Yushchenko, O.V. Bulat, G.V. Svyagintseva, V.I. Samoilenko and Yu.M. Kakhovskyi

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Abstract
Investigation of the effect of nitrogen alloying and yttrium and zirconium oxide additives to the weld pool on the structure of an austenitic weld and its microhardness in the zone of its fusion with pearlitic base metal was studied for the case of joints of dissimilar steels (austenitic with pearlitic), made by coated-electrode arc welding. It is shown that nitrogen alloying of weld metal of Kh20N9G6 type through the electrode coating practically does not affect the dendrite dimensions, but lower the microhardness (risk of martensite formation) in the zone of fusion with pearlitic base metal. In the case of yttrium or zirconium oxide additives to the austenitic metal of Kh15N25M6AG2 type through the coating, its dendrite structure is refined significantly, and metal microhardness in the fusion zone drops to the level that is indicative of martensite absence. 8 Ref., 2 Tables, 4 Figures.
Keywords: arc welding, coated electrodes, austenitic deposited metal, transition zone with pearlitic metal, structure, microhardness

Received 16.01.2020

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