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Structure, defectiveness, and service life of heat-resistant steel during prolonged operation

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Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    After prolonged operation of various steam pipes (85\2-105,000 h) the structural condition of the steel becomes uniform.

  2. 2.

    With uniform structure of steel after prolonged operation at high temperatures the main factor determining the service life is the level of defectiveness.

    A correlation was found between the creep rate and the level of defectiveness of steel with a uniform structure: in

    $$\dot \varepsilon = \kappa \omega ^n .$$
  3. 3.

    One of the main reasons for the onset of the third stage of creep is the sudden intensification of diffusion processes in the presence of a branched system of pores.

  4. 4.

    To reduce the level of defectiveness it is expedient to conduct restoration cyclic heat treatment (RCHT) consisting in repeated phase recrystallization.

    After 8–10 cycles of RCHT the volume of defects decreases 50–60% in greatly damaged pipe, as the result of which the creep rate decreases considerably.

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Literature cited

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Authors
  1. V. I. Kumanin
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 26–29, December, 1980

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Kumanin, V.I. Structure, defectiveness, and service life of heat-resistant steel during prolonged operation. Met Sci Heat Treat 22, 882–886 (1980). https://doi.org/10.1007/BF00779397

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  • DOI: https://doi.org/10.1007/BF00779397

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