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Basic physical and chemical concepts for controlling δ-ferrite content when welding with austenite-ferrite materials
https://doi.org/10.22349/1994-6716-2018-96-4-42-52
Abstract
The paper shows the influence of steel chemical composition on δ-ferrite behavior throughout the entire range of temperature considering welding consumables. Materials for joints are manufactured of the 10Kh19N11M4F, currently used for welding high-strength low-alloy steels. This steel prospects for welding high-nitrogen corrosion-resistant steels saving their non-magnetism, including the zone of welded joint, were analyzed on the basis of these studies. Using thermodynamic modeling, critical parameters were found that determine the behavior of δ-ferrite during solidification and subsequent cooling of solid steel. The most important parameters are the depth of the σ-ferritic transformation and the maximum equilibrium temperature of austenitization, which were used to interpret the experimental data obtained during hot physical modeling of welding. The areas of promising compositions of materials for welding of low-alloyed high-strength and high-nitrogen corrosion-resistant steels without hot cracks and providing, if necessary, the non-magnetic seam were found and depicted on a fragment of an improved Scheffler – Speidel diagram.
About the Authors
A. A. Kazakov
Peter the Great St Petersburg Polytechnic University
Russian Federation
Russian Federation
Dr Sc. (Eng)
29, Polytechnicheskaya St, 195251 St Petersburg
O. V. Fomina
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
Cand Sc. (Eng)
49, Shpalernaya St, 191015, St Petersburg
A. I. Zhitinev
Peter the Great St Petersburg Polytechnic University
Russian Federation
29, Polytechnicheskaya St, 195251 St Petersburg
Russian Federation
29, Polytechnicheskaya St, 195251 St Petersburg
P. V. Melnikov
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
Cand Sc. (Eng)
49, Shpalernaya St, 191015, St Petersburg
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Review
For citations:
Kazakov A.A., Fomina O.V., Zhitinev A.I., Melnikov P.V. Basic physical and chemical concepts for controlling δ-ferrite content when welding with austenite-ferrite materials. Voprosy Materialovedeniya. 2018;(4(96)):42-52. (In Russ.) https://doi.org/10.22349/1994-6716-2018-96-4-42-52
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