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2016 №08 (04) DOI of Article
10.15407/as2016.08.05 		2016 №08 (06)

Automatic Welding 2016 №08


Avtomaticheskaya Svarka (Automatic Welding), #8, 2016, pp. 29-34
 

Peculiarities of development of structural heterogeneity in the fusion zone of pearlite steel with austenitic nitrogen-containing weld metal

V.P. Elagin, V.N. Lipodaev And G.N. Gordan


E.O. Paton Electric Welding Institute, NASU, 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
Abstract
The peculiar features of development of structural heterogeneity at high-temperature heating in the unstable fusion zone of the austenitic weld with the pearlite steel were considered. It was shown that one of the factors influencing the high nickel content in the weld and low heat input of welding on reduction of width of ferrite interlayer is the decrease in overheating and degradation of carbides in the HAZ metal. However, these changes do not prevent the film precipitation of carbides and embrittlement of metal between the fusion zone and the HAZ. The alloying of austenitic weld metal with nitrogen, formation of nitride particles being more stable than the carbides, and refining the grains facilitate the increase in stability of structure, inhibition of carbide reactions and more uniform distribution of carbides in the fusion zone with pearlite steel, which improves the properties of welded joints of dissimilar steels. 14 Ref., 7 Figures.
 
Keywords: arc welding, welded joints of dissimilar steels, fusion zone, structural heterogeneity, diffusion of carbon, austenitic weld, nickel, nitrogen, decarburized zone, carburized zone, heat affected zone
 
 
Received:                15.05.16
Published:               03.10.16
 
 
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