Integrity and lifetime in extreme environment of Arctic regions

Lepov, Valeriy

doi:10.1016/j.prostr.2019.12.106

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…Failures in storage tank also occurred on different occasions in 1919 and 1978 [2]. Research for the development of high strength steel alloys for low-temperature applications that can withstand critical loads in extreme environments have been done [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Fragility analysis under low temperature of steel alloy used in helicopter bolt

Schild¹,

Costa²,

Biehl³

et al. 2022

Tecnol. Metal. Mater. Min.

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Steels parts used in helicopters are critical in terms of mechanical performance and safety issues where failure can lead to catastrophic consequences. The objective of this study was to evaluate the influence of low temperatures on toughness, through impact testing, on 45NiCrMo16 steel alloy used in the manufacture of bolts used on a helicopter rotor. The aircraft that the studied bolt is used can operate in the Antarctic environment. The temperatures used in the Charpy tests were -40 ºC, -20 ºC, 0 ºC, and 25 ºC. Besides, microstructural analysis (optical and scanning microscopy) and microhardness were done to identify the steel phases/microconstituents and any surface treatment presence. The results showed the presence of a hardened layer, a decrease in impact toughness with decreasing temperature, and a transition from ductile to brittle fracture. The conclusions indicate behavior that can restrict or limit this steel grade application in extreme temperature conditions, that is the ductile-brittle transition region begins from a decrease in temperature starting from -20 ºC.

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Section: Introductionmentioning

confidence: 99%

Fragility analysis under low temperature of steel alloy used in helicopter bolt

Schild¹,

Costa²,

Biehl³

et al. 2022

Tecnol. Metal. Mater. Min.

View full text Add to dashboard Cite

show abstract

The Ninth Eurasian Symposium on Strength and Service Life at Low Temperature, dedicated to 50th Anniversary of V.P. Larionov Institute of Physico-Technical Problems of the North

Lepov

Lebedev

Petrov

2020

Procedia Structural Integrity

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Assessment of the Impact of an Emergency Oil Spill on the Surface Waters of the Pyasina River Basin

et al. 2022

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The ecological state of the Pyasina river basin was assessed by the microbiological and chemical composition of surface waters. The waters of the Bezymyanny (Nadezhdinsky) stream, the Daldykan, Ambarnaya, Pyasina, Dudypta and Tareya rivers, Pyasinsky lakes were studied. The content of oil products, sulfate ions, copper, nickel, iron and manganese in water was identfied. The microbiological composition of waters was analyzed and saprophytes, oligotrophic plants, bacteria oxidizing individual hydrocarbons and oil were isolated. It is shown that the aquatic ecosystems of the Norilsk industrial region are exposed to technogenic impact with subsequent local anomalies in pollutant concentrations. The ecological state of the studied reservoirs was determined by the number of saprophytic bacteria.

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Integrity and lifetime in extreme environment of Arctic regions

Cited by 3 publications

References 4 publications

Fragility analysis under low temperature of steel alloy used in helicopter bolt

Fragility analysis under low temperature of steel alloy used in helicopter bolt

The Ninth Eurasian Symposium on Strength and Service Life at Low Temperature, dedicated to 50th Anniversary of V.P. Larionov Institute of Physico-Technical Problems of the North

Assessment of the Impact of an Emergency Oil Spill on the Surface Waters of the Pyasina River Basin

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