Role of Nonmetallic Inclusions in Premature Stress-Corrosion Fractures of Drill Pipes

Autor:	E. І. Kryzhanivskyi, H. М. Nykyforchyn, О. Z. Student, H. V. Krechkovs’ka, І. І. Chudyk
Rok vydání:	2020
Předmět:	Structural material Materials science Drill 020502 materials 020209 energy Mechanical Engineering education 02 engineering and technology Condensed Matter Physics Durability Corrosion Stress (mechanics) 0205 materials engineering Mechanics of Materials Solid mechanics 0202 electrical engineering electronic engineering information engineering Fracture (geology) General Materials Science Composite material Elongation
Zdroj:	Materials Science. 55:822-830
ISSN:	1573-885X 1068-820X
DOI:	10.1007/s11003-020-00375-4
Popis:	We analyze the causes of the in-service loss of integrity of drill pipes made of G105 steel connected with their premature stress-corrosion fractures. In this case, the mechanical characteristics of steel are satisfactory, except a somewhat lowered elongation. At the same time, both in the structure and on the fracture surfaces of impact test specimens, we reveal a large number of corrosion-active nonmetallic inclusions of the calcium-aluminate type, which may increase the rate of local corrosion by an order of magnitude, promote the formation of deep pits on the inner surface of the pipe, and play the role of sites of initiation of corrosion-fatigue cracks. This is why we assume that the stage of crack initiation, which mainly determines the total durability of drill pipes after premature failures is controlled by the presence of corrosion-active nonmetallic inclusions and their density in the structure of steel.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a9ee4e8f09e965fb9ecc3047123b8a46 https://doi.org/10.1007/s11003-020-00375-4 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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