Manufacturing Technology 2023, 23(6):893-899 | DOI: 10.21062/mft.2023.091

Effect of PWHT of X6Cr-NiNbN 25-20 Steel on the Evolution of the Sigma Phase during Creep Exposure at 700 °C

Jakub Rehorek ORCID...1,2
1 Faculty of Materials Science and Technology, VSB Technical University of Ostrava. 17. listopadu 2172/15, 708 00 Ostrava-Poruba. Czech Republic
2 Research Centere Rez. Hlavni 130, 250 68 Husinec-Rez Czech Republic

Superheaters and reheaters made of heat–resistant austenitic steels are being replaced in existing fos-sil fuel power plants to operate at Advanced Ultra Super Critical (A-USC) parameters of steam. New-ly developed and used high nickel content austenitic steels, such as in X6Cr NiNbN 25-20, are pre-dicted to significantly suppress the precipitation of a hazardous σ-phase during long-term creep expo-sure. The σ-phase causes premature failure of the component during creep, which is usually support-ed by a local change in hardness in the case of welded assemblies. Experimental results show that PWHT significantly improved reduction of area. However, for the PWHT specimen with a shorter exposure time of 15,712 hours, there was an acceleration in the precipitation of σ-phase particles dur-ing creep at 700 °C compared to the specimen in the AW state, after 20,557 hours.

Keywords: HR3C, Weld joint, σ phase, Creep, PWHT, A-USC
Grants and funding:

This publication was prepared with the support of the Technology Agency CR in the THETA Programme within the project: TK03020055. The presented results were obtained using the CICRR infrastructure, which is financially supported by the Ministry of Education, Youth and Sports – project LM2023041. The presented work has been realized within Institutional Support by Ministry of Industry and Trade of the Czech Republic

Received: September 2, 2023; Revised: November 2, 2023; Accepted: November 13, 2023; Prepublished online: November 27, 2023; Published: December 22, 2023  Show citation

ACS AIP APA ASA Harvard Chicago IEEE ISO690 MLA NLM Turabian Vancouver
Rehorek J. Effect of PWHT of X6Cr-NiNbN 25-20 Steel on the Evolution of the Sigma Phase during Creep Exposure at 700 °C. Manufacturing Technology. 2023;23(6):893-899. doi: 10.21062/mft.2023.091.
Share...
Download citation
  • BibTeX (.bib)
  • Bookends (.ris)
  • EasyBib (.ris)
  • EndNote (.enw)
  • EndNote 8 (.xml)
  • ISI WoS (.isi)
  • Medlars (.medlars)
  • Mendeley (.ris)
  • MODS (.xml)
  • Papers (.ris)
  • RefWorks (.txt)
  • RefManager (.ris)
  • RIS (.ris)
  • MS Word (.xml)
  • Zotero (.ris)
    • Open full article

    References

    1. MASUYAMA, F. (2001). History of power plants and progress in heat resistant steels. In: JSIT International, Vol. 41, No. 6, pp. 612 - 625. Japan. ISSN 0915-1559 Go to original source...
    2. KOLLOVÁ, A., PAUEROVÁ, K. (2022). Superalloys - Characterization, Usage and Recycling. In: Manufacturing Technology, Vol. 22, No. 5, pp. 550 - 557. Slovak Republic. ISSN 2787-9402. Go to original source...
    3. ©ERE©OVA, M., ©TEFANICA, J., VITVAROVÁ, M., et al. (2020). Life Cycle Performance of Various Energy Sources Used in the Czech Republic. In: Energies, Vol. 13, No. 21, 5833 p. Czech Republic. ISSN 1996-1073. Go to original source...
    4. ABE, F. (2015) Research and Development of Heat-Resistant Materials for Advanced USC Power Plants with Steam Temperatures of 700 °C and Above. In: Engineering, Vol. 1, No. 2, pp. 211 - 224. Japan. ISSN 2095-8099. Go to original source...
    5. DI GIANFRANCESCO, A. (2017). The fossil fuel power plants technology. Materials for Ultra-Supercritical and Advanced Ultra-Supercritical Power Plants, pp. 1 - 49. Italy. ISBN 978-0-08-100552-1. Go to original source...
    6. MINAMI, Y., KIMURA, H., IHARA Y. (1986). Microstructural changes in austenitic stainless steels during long-term aging. In: Materials Science and Technology. Vol. 2. Japan. ISSN 795-806. Go to original source...
    7. International Organization for Standardization. (2009). Metallic materials - Iniaxial creep testing in tension - Meth-od of test. Switzerland. ISO Standard No. 204:2009.
    8. LARSON, F.R., MILLER, J. (1952). Time-Temperature Relationship for Rupture and Creep Stresses. In: Transaction of ASME, Vol. 74, pp. 765 - 771. Go to original source...
    9. VA©KO, A., BELAN, J., TILLOVÁ, E. (2020). Use of colour etching in the structural analysis of graphitic cast irons. In: Manufacturing Technology, Vol. 20, No. 6, pp. 845-848. Slovak Republic. ISSN 2787-9402. Go to original source...
    10. WEISS, V., SVOBODOVÁ, J. (2015). The Use of Colour Metallography and EDS for Identification of Chemical Heterogeneity of Selected Aluminium Alloys Copper and Zinc Alloyed. In: Manufacturing Technology, Vol. 15, No. 6, pp. 1048-1053. Czech Republic. ISSN 2787-9402. Go to original source...
    11. STŘIHAVKOVÁ, E., WEISS, V. (2012). The Identification of the structures new type Al-Si-Mg Ca alloys with different Ca content using of the color metallography. In: Manufacturing Technology, Vol. 12, No. 2, pp. 248-251. Czech Republic. ISSN 2787-9402 Go to original source...
    12. BARCIK, J. (1988). Mechanism of σ-phase precipitation in Cr-Ni austenitic steels. In: Materials Science and Technology, Vol. 4, No. 1, pp. 5 - 15. Go to original source...
    13. American Society for Testing and Materials. (2021). Standard Test Methods for Determining Average Grain Size. United States of America. ASTM Standard No. E112-13(2021).
    14. American Society for Testing and Materials. (2022). Standard Test Method for Microindentation Hardness of Materials. United States of America. ASTM Standard No. E384-22.
    15. POMIKALEK, L., HERMANOVA, S., DOBROVODSKA, L. (2013). Effect of Welding on the Properties of HR3C, Super 304H, TP347HFG and P92 Steels. In: METAL 2014, Vol. 23. Czech Republic. ISSN 2694-9296.
    16. Verband Der Technischen Überwachungs-Vereine e.V. (2009). VdTÜV Werkstoffblatt 546 - Warmfester Walz und Schmiedestahl X6CrNiNbN25-20, 1.4952, 6 p. Germany.
    17. KUBON, Z., STEJSKALOVA, S., KANDER, L. (2017). Effect of Sigma Phase on Fracture Behavior of Steels and Weld Joints of Components in Power Industry Working at Supercritical Conditions. In: Austenitic Stainless Steels - New Aspects, 218 p. (InTech). Czech Republic. ISBN 978-953-51-3701-6. Go to original source...
    18. SOURMAIL, T. (2001). Precipitation in creep resistant austenitic stainless steels. In: Materials Science and Technology. Vol. 17, No. 1, pp 1 - 14. United Kingdom. ISSN 0267-0836, 1743-2847. Go to original source...
    19. LEE, Ch., ROH, S., LEE, Ch., et al. (2018). Influence of Si on sigma phase precipitation and pitting corrosion in superaustenitic stainless steel weld metal. In: Materials Chemistry and Physics. Vol. 207, pp 91 - 97. Republic of Korea. ISSN 0254-0584. Go to original source...

    This is an open access article distributed under the terms of the Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0), which permits non-comercial use, distribution, and reproduction in any medium, provided the original publication is properly cited. No use, distribution or reproduction is permitted which does not comply with these terms.


    Return to the content