New Type of Corrosion-Active Nonmetallic Inclusions and their Influence on the Corrosion of 38KHN3МFА Steel

We study the influence of corrosion-active nonmetallic inclusions on the corrosion of 38KhN3MFA steel. A new type of fluorine-containing inclusions of this kind with a size 2–30 μm is discovered. These inclusions are responsible for anomalously rapid damage of drill pipes made of the indicated type...

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Veröffentlicht in:Materials science (New York, N.Y.) N.Y.), 2020-03, Vol.55 (5), p.617-624
Hauptverfasser: Khoma, М. S., Vinar, V. А., Chornyi, О. V., Maksishko, Yu. Ya, Іvashkiv, V. R., Rats’ka, N. B.
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container_issue 5
container_start_page 617
container_title Materials science (New York, N.Y.)
container_volume 55
creator Khoma, М. S.
Vinar, V. А.
Chornyi, О. V.
Maksishko, Yu. Ya
Іvashkiv, V. R.
Rats’ka, N. B.
description We study the influence of corrosion-active nonmetallic inclusions on the corrosion of 38KhN3MFA steel. A new type of fluorine-containing inclusions of this kind with a size 2–30 μm is discovered. These inclusions are responsible for anomalously rapid damage of drill pipes made of the indicated type of steel. It is difficult to identify them with the help of metallographic analysis. They do not affect the general chemical composition of steel, the characteristics of strength and impact toughness at room and lowered (– 50°С) temperatures. We propose a new approach to the detection of corrosion-active nonmetallic inclusions in steels reduced to the investigation of the fracture surfaces of specimens instead of their microsections. Unlike the existing methods, this approach enables one to determine the chemical composition and correctly reproduces the shape of inclusions.
doi_str_mv 10.1007/s11003-020-00351-y
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1573-885X
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source SpringerNature Journals
subjects Characterization and Evaluation of Materials
Chemical composition
Chemistry and Materials Science
Corrosion
Corrosion tests
Drill pipe
Fluorine
Fracture surfaces
Impact strength
Materials Science
Nonmetallic inclusions
Solid Mechanics
Steel
Structural Materials
title New Type of Corrosion-Active Nonmetallic Inclusions and their Influence on the Corrosion of 38KHN3МFА Steel
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