Estimation of Reliability of 09G2S Steel Structures Operating in the North and the Arctic

Abstract

This article presents estimates of damage and lifetime of welded 09G2S structures upon operation under severe conditions of the Arctic and subarctic regions. Accumulation of damage in steel subjected to low temperature ductile–brittle transition has been estimated by measurement of impact toughness in samples with V notch in the corresponding temperature range. On the basis of experimental data, it has been established that the decrease in temperature leads to significant loss of plasticity in the heat-affected zone, where stresses are localized and accelerated growth of cracks and microdefects takes place. As a consequence, the lifetime of steel structure decreases. On the basis of the Kachanov–Rabotnov theory of damage accumulation, a procedure has been proposed for estimating the integral damage of steel of a welded structure subjected to ductile–brittle transition depending on lifetime under certain climatic conditions. Comparison of estimates of accumulated damage in material of structures operating under extreme conditions of Yakutia and under moderate conditions of Krasnoyarsk krai (Russia) makes it possible to conclude that the mean time between failures is determined by climatic conditions. The developed procedure for estimating damage accumulation in the temperature range of ductile–brittle transition would make it possible to decrease the scope of required tests without loss of data reliability. In addition, on its basis, it is possible to diagnose all dangerous industrial objects with restricted access.

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Correspondence to A. V. Grigor’ev.

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Translated by I. Moshkin

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Grigor’ev, A.V., Lepov, V.V. Estimation of Reliability of 09G2S Steel Structures Operating in the North and the Arctic. Inorg Mater 56, 1516–1520 (2020). https://doi.org/10.1134/S0020168520150078

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Keywords:

  • damage
  • lifetime
  • low temperatures
  • ductile–brittle transition
  • steel
  • impact toughness
  • crack
  • heat-affected zone
  • loss of plasticity