Моделирование Механизма Торможения Дислокаций Порами В Вольфраме

Казаков, А; Шарапова, Ю; Бабичева, Р; Дмитриев, С; Корзникова, Е

doi:10.33184/fmpve2022-2022-10-19.199

Cited by 1 publication

(1 citation statement)

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“…5), из которого видно, что вокруг включения Cr 2 O 3 -MnO -TiO 2 зоны обеднения нет. Поскольку диффузионная релаксация реагентов вокруг растущего в жидком металле включения происходит за несколько секунд [29], и концентрации реагентов вокруг быстро выравниваются, обеднение возможно только лишь при росте включения в твердом металле, когда скорость диффузии снижается на несколько порядков [30]. За счет того, что оксиды Cr 2 O 3 -MnO -TiO 2 формируются в виде первичных включений (рис.…”

Section: влияние нв на коррозионную стойкостьunclassified

Increasing the corrosion properties of duplex steel with REM modification

Karasev,

Kodzhaspirov,

Fedorov

et al. 2024

Izv. vysš. učebn. zaved., Čern. metall.

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Duplex stainless steels are a modern class of materials with a unique combination of high corrosion and mechanical properties. Due to this, they can be widely used in machine parts and aggregates in fields with aggressive oil and gas production conditions. One of the disadvantages of these materials is their tendency to local corrosion damage on non-metallic inclusions, other things being equal, formed during smelting and casting. To control the purity of steel in conditions of open induction smelting, it is effective to use modification with rare earth metals (REM). Therefore, the purpose of this work was to determine the optimal content of REM in duplex steel to increase corrosion properties. Thermodynamic modeling of the formation of nonmetallic inclusions in duplex corrosion-resistant steel S32750 was carried out and the results of calculations were compared with the experimental data. It is shown that there is an optimal concentration of REM at which contamination with inclusions is minimal due to favorable conditions for their removal, and with a further increase in consumption it increases due to coagulation of a large number of refractory oxides. Electrochemical tests were performed and parameters such as corrosion potential, pitting formation potential and the basis of pitting resistance of experimental steels were determined. Therefore, the corrosion properties of the investigated duplex steel are significantly improved when treated with REM. The electrochemical potentials of different types of inclusions are evaluated on a qualitative level. Based on the obtained results on corrosion resistance and contamination of the studied castings, the optimal amount of REM introduced for modifying inclusions is 0.05 % (0.65Ce + 0.35La).

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Section: влияние нв на коррозионную стойкостьunclassified