Study on Normalizing and Tempering Treatment Regime of Homogenization of P92 Weldments

V. K. Pal, L. P. Singh

Sam Higginbottom University of Agriculture, Technology and Sciences Allahabad, IN-211007 Uttar Pradesh, India

Received: 07.08.2023; final version - 05.10.2023. Download: PDF

The present research work describes the effect of normalizing and tempering (N&T) treatment on microstructure evolution in various zones of gas tungsten arc-welded (GTAW) P92 pipe weldments. For N&T treatment, P92 pipe weldments are subjected to various normalizing (950-1150°C) and tempering (730-800°C) temperatures. The effect of varying heat treatment on tensile properties and hardness of P92 pipe weldments are studied for V-groove and narrow-groove weld designs. The effect of increase in normalizing temperature (at fixed tempering temperature) results in increase in strength and hardness, while increase in tempering temperature (at fixed normalizing temperature) results in the decrease in strength and hardness of P92 steel weldments. Creep strength-enhanced ferritic/martensitic P92 steel is considered as a candidate material for the reactor pressure vessels and reactor internals of Very High Temperature Reactor (VHTR). The heterogeneous microstructure formation across the P92 weldments leads to premature Type IV cracking and makes the weldability of P92 steel as a serious issue. The better combination of strength, ductility and microstructure are obtained for the maximum normalizing temperature of 1050°C and tempering temperature of 760°C. The effect of increase in normalizing temperature (at fixed tempering temperature) results in increase in strength and hardness, while increase in tempering temperature (at fixed normalizing temperature) results in the decrease in strength and hardness of P92 steel weldments.

Key words: normalizing, tempering, P92 pipe weldments, microstructure, mechanical properties.

URL: https://mfint.imp.kiev.ua/en/abstract/v46/i05/0431.html

DOI: https://doi.org/10.15407/mfint.46.05.0431

PACS: 06.60.Vz, 68.37.Yz, 78.70.En, 81.20.Vj, 81.40.Ef, 81.40.Lm, 81.70.Bt

Citation: V. K. Pal and L. P. Singh, Study on Normalizing and Tempering Treatment Regime of Homogenization of P92 Weldments, Metallofiz. Noveishie Tekhnol., 46, No. 5: 431—452 (2024)


REFERENCES
  1. S. L. Mannan, S. C. Chetal, B. Raj, and S. B. Bhoje, Trans. Indian Inst. Met., 35: 1 (2003).
  2. C. Pandey, M. M. Mahapatra, P. Kumar, and N. Saini, J. Nucl. Mater., 498: 176 (2018). Crossref
  3. K. L. Murty and I. Charit, J. Nucl. Mater., 383: 189 (2008). Crossref
  4. M. Marietta and E. Systems, Ornl/tm-9045 de85 012618 (1984).
  5. C. Pandey and M. M. Mahapatra, J. Mater. Eng. Perform., 25: 2761 (2016). Crossref
  6. M. E. Abd El-Azim, O. E. El-Desoky, H. Ruoff, F. Kauffmann, and E. Roos, Mater. Sci. Technol., 29: 1027 (2013). Crossref
  7. K. Laha, K. S. Chandravathi, P. Parameswaran, K. B. S. Rao, and S. L. Mannan, Metall. Mater. Trans. A, 38: 58 (2007). Crossref
  8. K. Maruyama, K. Sawada, and J. Koike, ISIJ Int., 41: 641 (2001). Crossref
  9. H. K. Danielsen and J. Hald, Comput. Coupling Phase Diagrams Thermochem., 31: 505 (2007). Crossref
  10. H. K. Danielsen and J. Hald, Mater. Sci. Eng. A, 505: 169 (2009). Crossref
  11. M. Abd El-Rahman Abd El-Salam, I. El-Mahallawi, and M. R. El-Koussy, Int. Heat Treat. Surf. Eng., 7: 23 (2013). Crossref
  12. V. L. Manugula, K. V. Rajulapati, G. M. Reddy, and K. B. S. Rao, Mater. Sci. Eng. A, 698: 36 (2017). Crossref
  13. S. K. Albert, M. Matsui, T. Watanabe, H. Hongo, K. Kubo, and M. Tabuchi, Int. J. Press. Vessel. Pip., 80: 405 (2003). Crossref
  14. K. Sawada, M. Bauer, F. Kauffmann, P. Mayr, and A. Klenk, Mater. Sci. Eng. A, 527: 1417 (2010). Crossref
  15. J. A. Francis, W. Mazur, and H. K. D. H. Bhadeshia, ISIJ Int., 44: 1966 (2004). Crossref
  16. D. Dean and M. Hidekazu, Comput. Mater. Sci., 37: 209 (2006).
  17. F. William and Jr. Newell, Weld. J., 89: 33 (2010).
  18. M. L. Santella, R. W. Swindeman, R. W. Reed, and J. M. Tanzosh, EPRI Conf. 9Cr Mater. Fabr. Join. Technol. (2001).
  19. ASTM A370-14, Standard Test Methods and Definitions for Mechanical Testing of Steel Products (2014).
  20. ASTM E8/E8M-13a, Standard Test Methods for Tension Testing of Metallic Materials (2009).
  21. D. R. Barbadikar, G. S. Deshmukh, L. Maddi, K. Laha, P. Parameswaran, A. R. Ballal, D. R. Peshwe, R. K. Paretkar, M. Nandagopal, and M. D. Mathew, Int. J. Press. Vessel. Pip., 132-133: 97-105 (2015). Crossref