Formation of a Transition Zone Structure in Welded Joints between Dissimilar Steels

Abstract:

The results of structural research of welded joints between pearlitic high-carbon steel and austenitic chrome-nickel steel obtained by contact welding are presented. As a result of the diffusion process and mechanical mixing of steels local alloyed areas surrounded by pearlitic colonies of high-carbon steel are formed in the transition zone of the weld. The transmission electron microscopy (TEM) has been employed. The formation of the austenitic-martensitic microstructure occurs due to reducing the amount of alloying elements in local areas as compared to the original austenitic chrome-nickel steel chemical composition. Both austenite and martensite have crystallographic characteristics with the following orientation relationships: [211] γ-Fe || [011] α-Fe; [11-1] γ-Fe || [-110] α-Fe. The presence of high-strength local regions in the transition area may lead to a significant reduction in сrack resistance of dissimilar steels welded joints.

• Periodical: Applied Mechanics and Materials (Volume 698)
• Pages: 283-287
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.698.283
• Online since: December 2014
• Authors: Aelita Nikulina*, Alexandr Smirnov, Alexandra Chevakinskaya
• Keywords: Austenite, Contact Welding, Dissimilar Steels, Martensite, Microstructure, Transmission Electron Microscopy

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