Journal of Materials Engineering and Performance

, Volume 20, Issue 8, pp 1474–1480 | Cite as

Analysis of the Creep Behavior of P92 Steel Welded Joint

  • Junchao An
  • Hongyang Jing
  • Guangchun Xiao
  • Lei Zhao
  • Lianyong Xu
Article
First Online:
Received:
Revised:

Abstract

Different regions of heat-affected zone (HAZ) were simulated by heat treatment to investigate the mechanisms of the Type IV fracture of P92 (9Cr-2W) steel weldments. Creep deformation of simulated HAZ specimens with uniform microstructures was investigated and compared with those of the base metal (BM) and the weld metal (WM) specimens. The results show that the creep strain rate of the fine-grained HAZ (FGHAZ) is much higher than that of the BM, WM, the coarse-grained HAZ (CGHAZ), and the inter-critical HAZ (ICHAZ). According to the metallurgical investigation of stress-rupture, the FGHAZ and the ICHAZ have the most severely cavitated zones. During creep process, carbides become coarser, and form on grain boundaries again, leading to the deterioration of creep property and the decline of creep strength. In addition, the crack grows along the FGHAZ adjacent to the BM in the creep crack growth test (CCG) of HAZ.

Keywords

cavity creep creep crack growth (CCG) heat-affected zone 
This is a preview of subscription content, log in to check access.

Notes

Acknowledgment

The authors acknowledge the research funding and support by National Natural Science Foundation for Youth of China (Grant No. 50805103), Tianjin Nature Science Foundation of China (Grant No. 08JCZDJC18100) , Tianjin Nature Science Foundation of China (Grant No. 08JCYBJC09100) and New Teacher Project in Doctor sites Foundation of China Ministry of Education (Grant No. 20070056096).

References

  1. 1.
    R. Blum and R.W. Vanstone, Materials Development for Boilers and Steam Turbines Operating at 700 °C, Proceedings of the Sixth International Charles Parsons Turbine Conference, September 16–18, 2003 (Dublin, Ireland), 2003, p 489–510Google Scholar
  2. 2.
    R. Viswanathan, J.F. Henry, J. Tanzosh, G. Stanko, J. Shingledecker, and B. Vitalis, US Program on Materials Technology for USC Power Plants, Proceedings of the Fourth International Conference on Advances in Materials Technology for Fossil Power Plants, 25–28 October 2004 (Hilton Head Island, South Carolina, USA), 2004, p 3–19Google Scholar
  3. 3.
    F. Abe, H. Okada, S. Wanikawa, M. Tabuchi, T. Itagaki, K. Kimura, K. Yamaguchi, and M. Igarashi, Guiding Principles for Development of advanced Ferritic Steels for 650 1C USC Boilers, Proceedings of the Seventh Liege Conference on Materials for Advanced Power Engineering 2002, 30 September–2 October, 2002 (Liege, Belgium), 2002, p 1397–1406Google Scholar
  4. 4.
    M.E. Kassner and T.A. Hayes, Creep Cavitation in Metals, Int. J. Plast., 2003, 19(10), p 1715–1748CrossRefGoogle Scholar
  5. 5.
    J.H. Kim, Y.J. Oh, I.S. Hwang, D.J. Kim, and J.T. Kim, Fracture Behavior of Heat-Affected Zone in Low Alloy Steels, J. Nucl. Mater., 2001, 299(2), p 132–139CrossRefGoogle Scholar
  6. 6.
    D.M. Rodrigues, L.F. Menezes, and A. Loureiro, The Influence of the HAZ Softening on the Mechanical Behaviour of Welded Joints Containing Cracks in the Weld Metal, Eng. Fract. Mech., 2004, 71(13–14), p 2053–2064CrossRefGoogle Scholar
  7. 7.
    F. Abe and M. Tabuchi, Microstructural and Creep Strength of Welds in Advanced Ferritic Power Plant Steels, Sci. Technol. Weld. Join., 2004, 9, p 22–30CrossRefGoogle Scholar
  8. 8.
    E. Letofsky and H. Cerjak, Metallography of 9Cr Steel Power Plant Weld Microstructures, Sci. Technol. Weld. Join., 2004, 9, p 31–36CrossRefGoogle Scholar
  9. 9.
    Y. Hasegawa, M. Ohgami, and Y. Okamura, Creep Properties of Heat Affected Zone of Weld in W Containing 9-12% Chromium Creep Resistant Martensitic Steels at Elevated Temperature. Advanced Heat Resistant Steels for Power Generation, IOM Communications, The University Press, Cambridge, 1999, p 655–667Google Scholar
  10. 10.
    M. Tabuchi, T. Watanabe, K. Kubo, M. Matsui, J. Kinugawa, and F. Abe, Microstructure and Creep Strength of Welded Joints for W Strengthened High Cr Ferritic Steel, J. Soc. Mater. Sci., 2001, 50, p 116–121 (in Japanese)CrossRefGoogle Scholar
  11. 11.
    M. Tabuchi, T. Watanabe, K. Kubo, M. Matsui, J. Kinugawa, and F. Abe, Creep Crack Growth Behavior in the HAZ of Weldments of W Containing High Cr Steel, Int. J. Pres. Ves. Pip., 2001, 78, p 779–784CrossRefGoogle Scholar
  12. 12.
    M. Matsui, M. Tabuchi, T. Watanabe, K. Kubo, J. Kinugawa, and F. Abe, Degradation of Creep Strength in Welded Joint of 9-12%Cr Steels, ISIJ Int., 2001, 41, p S126–S130CrossRefGoogle Scholar
  13. 13.
    M. Tabuchi, M. Matsui, T. Watanabe, H. Hongo, K. Kubo, and F. Abe, Creep Fracture Analysis of W Strengthened High Cr Steel Weldment, Mater. Sci. Res. Int., 2003, 9, p 23–28Google Scholar
  14. 14.
    T. Watanabe, M. Yamazaki, H. Hongo, M. Tabuchi, and T. Tanabe, Effect of Stress on Microstructural Change Due to Aging at 823 K in Multilayer Welded Joint of 2.25Cr-1Mo Steel, Int. J. Pres. Ves. Pip., 2004, 81, p 279–284CrossRefGoogle Scholar
  15. 15.
    T. Watanabe, Relationship Between Type IV Fracture and Microstructure on 9Cr-1Mo-V-Nb Steel Welded Joint Creep-Ruptured After Long Term, Tetsu-to-Hagane, 2004, 90, p 206–212 (in Japanese)Google Scholar
  16. 16.
    ASTM E1457-00, Standard Test Method for Measurement of Creep Crack Growth Rates in Metals, Annual Book of ASTM Standards, Vol 3 (No. 1), 2001, p 936–950Google Scholar
  17. 17.
    S.K. Albert, M. Matsui, H. Hongo, T. Watanabe, K. Kubo, and M. Tabuchi, Creep Rupture Properties of HAZs of a High Cr Ferritic Steel Simulated by a Weld Simulator, Int. J. Pres. Ves. Pip., 2004, 81(3), p 221–234CrossRefGoogle Scholar
  18. 18.
    H.H. Johnson, Calibrating the Electric Potential Method for Studying Slow Crack Growth, Mater. Res. Stand., 1965, 5, p 442–445Google Scholar
  19. 19.
    K.H. Schwalbe and D. Hellmann, Application of the Electrical Potential Method to Crack Length Measurements Using Johnson’s Formula, J. Test. Eval., 1980, 9(4), p 218–220Google Scholar
  20. 20.
    P.J. Ennis, A. Zielinska-Lipiec, O. Wachter, and A. Czyrska-Filemonowicz, Microstructural Stability and Creep Rupture Strength of the Martensitic Steel P92 for Advanced Power Plant, Acta Mater., 1997, 45, p 4901CrossRefGoogle Scholar
  21. 21.
    H. Riedel and J.R. Rice, Tensile Cracks in Creeping Solids Fracture Mechanics, Fracture Mechanics: Twelfth Conference, ASTM STP 700, American Society for Testing and Materials, 1980, p 112–130Google Scholar
  22. 22.
    B. Dogan and B. Petrovski, Creep Crack Growth oh High Temperature Weldments, Int. J. Pres. Ves. Pip., 2001, 78, p 795–805CrossRefGoogle Scholar
  23. 23.
    L. Allais, J.P. Dessalas, T. Forgeron et al., Creep Behaviour of Full-Size Welded Joints: Defect Acceptance Criteria, Fatig. Fract. Eng. Mater. Struct., 1998, 21, p 791–803CrossRefGoogle Scholar

Copyright information

© ASM International 2010

Authors and Affiliations

  • Junchao An
    • 1
  • Hongyang Jing
    • 1
  • Guangchun Xiao
    • 1
  • Lei Zhao
    • 1
  • Lianyong Xu
    • 1
  1. 1.School of Material Science and EngineeringTianjin UniversityTianjinChina

Personalised recommendations