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On the changing state of grain boundaries in boiler steel in service

  • Superplasticity of Metals and Alloys
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    In prolonged operation of steam pipes made from 12Kh1MF steel, carbide phases can be formed on the grain boundaries which increase the microhardness of these boundaries by 20–25%.

  2. 2.

    Formation of carbide phases on the grain boundaries makes the accommodation processes difficult, causes an increase in damage to steel and, consequently, a reduction in its operational reliability.

  3. 3.

    One of the methods of increasing the service life of steam pipes made from 12Kh1MF steel is the restoring heat treatment after a period of service (RTT). When the damage becomes considerable the RTT should be repeated several times. The number of cycles should be increased with increasing damage to the material.

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Literature cited

  1. R. Raj and M. Ashby, Met. Trans.,2, April, 113 (1971).

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  2. L. A. Kovaleva and V. I. Kumanin, "Evaluation of heat resistance by precision measurement of density," in: The Effect of Structure on the Development of Vulnerability in Heat-Resistant Steels [in Russian], NIIINFORMTYaZhMASh, No. 14-7614, 7 (1976).

  3. K. A. Lanskaya et al., "Structure and properties of long-working pipes from 12Kh1MF steel," Teploenergetika, No. 10, 9 (1975).

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  4. L. P. Tusov et al., "Increase of the service life of steam pipings by repeated heat treatment of pipes," Teploenergetika, No. 1, 66 (1977).

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  5. P. A. Antikain and V. I. Kumanin, "Structural changes in heat-resistant pearlitic steel caused by RTT," in: Diffusion, Phase Transformations, and Mechanical Properties of Metals and Alloys [in Russian], Vol. 12, Part 2, VZMI (1975), p. 6.

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Authors
  1. N. I. Kumanin
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Additional information

VZMI (All-Union Correspondence Institute of Mechanical Engineering). Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 37–39, March, 1981.

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Kumanin, N.I. On the changing state of grain boundaries in boiler steel in service. Met Sci Heat Treat 23, 192–195 (1981). https://doi.org/10.1007/BF00769614

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  • DOI: https://doi.org/10.1007/BF00769614

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