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Relationship between rupture stress and microstructure parameters of plastically deformed heat-resistant steel

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Abstract

The paper addresses the influence of plastic prestraining in tension and combined tension at 150 and 350°C on the rupture stress in 15Kh2MFA steel upon heat treatment that simulates irradiation embrittlement of materials in a WWER-440 type reactor towards the end of its lifetime. The dependence of rupture stress on the dislocation density in the material upon plastic prestraining is studied. It is found out that as the plastic prestraining in tension and combined tension grows, the dislocation density within small-angle boundaries increases and thus results in a larger rupture stress. An increase in rupture stress in the case of prestraining at 350°C is more intensive than that at 150°C. We analyze the microcrack nucleation and growth micromechanisms in 15Kh2MFA steel during tensile plastic deformation and discuss the effect of the material substructure on the microcrack arrest.

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Authors and Affiliations

  1. Ivan Pulyui Ternopol State Technical University, Ternopol, Ukraine

    P. V. Yasnii, V. B. Glad’o & I. B. Okipnyi

Authors
  1. P. V. Yasnii
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  2. V. B. Glad’o
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  3. I. B. Okipnyi
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Translated from Problemy Prochnosti, No. 4, pp. 19–30, July–August, 2007.

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Yasnii, P.V., Glad’o, V.B. & Okipnyi, I.B. Relationship between rupture stress and microstructure parameters of plastically deformed heat-resistant steel. Strength Mater 39, 349–357 (2007). https://doi.org/10.1007/s11223-007-0039-8

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  • DOI: https://doi.org/10.1007/s11223-007-0039-8

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