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Evolution of the second phases in the weld seams of 2.25Cr-Mo-0.25 V steel in different heat treatment states

  • Xiugang Duan EMAIL logo , Lin Zhu , Xinjin Zhang , Jie Huo and Liguo Ren
Published/Copyright: January 29, 2024
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 115 Issue 3

Abstract

The evolution characteristics of the second phases in the weld seams of 2.25Cr-Mo-0.25 V steel in three states – welded, post-weld heat-treated and creep states – during manufacturing and service were evaluated by calculations and observations using optical microscopy, scanning electron microscopy, transmission electron microscopy and X-ray diffraction spectrometry. The results showed that the second phase was M3C in the as-welded state. The types and quantities of the precipitated phases increased greatly after post-weld heat treatment (PWHT), and M3C, M2C, M7C3, M23C6 and MX were the main precipitated phases. During PWHT, the amount of M7C3 decreased, the amounts of M23C6 and MX increased, and the sizes of the second phases increased. The precipitates coarsened after long-term creep, and M7C3, M6C, M23C6, M2C, and MX were the main precipitate phases in this state. The size of the MX phase remained relatively stable during long-term creep, which contributed greatly to the creep resistance.

Keywords: 2.25Cr-Mo-0.25 V steel; Weld seams; Second phase; Evolution
Corresponding author: Xiugang Duan, Tianjin Heavy Industries Research & Development Co. LTD, No. 16 Luoda Road, Tianhe Techno-Park, Binhai New Area, 300457, Tianjin, P.R. China, E-mail:

  1. Research ethics: The local Institutional Review Board deemed the study exempt from review.

  2. Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.

  3. Competing interests: The authors state no conflict of interest.

  4. Research funding: Tianjin Science and Technology Plan Project No. 17YFZCGX00900.

  5. Data availability: The raw data can be obtained on request from the corresponding author.

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Received: 2021-11-08
Accepted: 2023-05-30
Published Online: 2024-01-29
Published in Print: 2024-03-25

© 2023 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/ijmr-2021-8636
Keywords for this article
2.25Cr-Mo-0.25 V steel; Weld seams; Second phase; Evolution

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. In Memoriam Prof. Günter Petzow
  4. Review
  5. Potential of multifunctional electrospun nanofibers in cancer management
  6. Original Papers
  7. Eco-friendly palm oil directed synthesis of mesoporous titania for photocatalytic application
  8. Synthesis of hydroxyapatite matrix Ag and CNT particle reinforced hybrid biocomposites with improved mechanical and antibacterial properties
  9. Strontium and copper co-doped nanohydroxyapatite for bone augmentation
  10. Influence of graphene concentration on the properties of the composite prepared with poly(2-ethyl aniline) by mechanochemical method
  11. Structure, dielectric and magnetic properties of hydrothermally synthesized Sn1−x Fe x O2 nanoparticles
  12. Enthalpies of mixing in ternary Ag–Eu–Sn liquid alloys
  13. Evolution of the second phases in the weld seams of 2.25Cr-Mo-0.25 V steel in different heat treatment states
  14. News
  15. DGM – Deutsche Gesellschaft für Materialkunde
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