10.15660/AUOFMTE.2022-1.3635
B Šimeková, I Kovaříková, M Šimek
Volume XXXI, 2022/1
The ferrite/austenite ratio is often upset in duplex stainless steel weld metals owing to the rapid cooling rates correlated with welding. To achieve the required ferrite/austenite balance and good properties, the welding process and the heat input must be controlled. Each joint obtained by electron beam welding and their individual sub-regions through thickness were characterised by optical microscopy. Distribution of elements in various areas was evaluated by scanning electron microscope (SEM/EDX). On the particular samples was observed microhardness and ferrite/austenite balance. Ultrasonic non - destructive testing was used for quality assessment of EBW duplex steel joints. Electron beam welding has produced weld joints with a significant decrease in austenite zone size. The ferrite/austenite balance of both weld metal and heat affected zone are influenced by heat input which is a function of welding process. This work describes the possibilities how to achieve the weld joints of high quality by using the optimal welding parameters
duplex stainless steels, electron beam welding, cooling rate, heat input, ferrite/austenite balance
ISSN 1583-0691, CNCSIS "Clasa B+"