Effect of postweld heat treatment on microstructures and hardness of TIG weldment between P22 and P91 steels with Inconel 625 filler metal

Authors

  • Nattaphon Tammasophon Faculty of Engineering, Chulalongkorn University
  • Weerasak Homhrajai Electricity Generating Authority of Thailand (EGAT)
  • Gobboon Lothongkum Faculty of Engineering, Chulalongkorn University

Keywords:

P22, P91, Post weld heat treatment, Microstructure, Hardness

Abstract

This research aims at searching for the optimal postweld heat treatment condition of the TIG weld joint between P22 (2.25Cr) and P91 (9Cr) steels using Inconel 625 as filler metal. The postweld heat treatment at 750°C for 2, 4 and 6 hours was applied in order to reach the proper microstructure and hardness for high performance in mechanical properties at elevated temperatures. It is recommended that postweld heat treatment at 750°C for 2 hours is the proper condition to reduce the hardness of heat affected zone (HAZ) of P91 steel.

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References

Electricity Generation Authority of Thailand. (2008). Failure report.

Das, C.R., Albert, S.K., Bhaduri, A.K., Srinivasan, G. & Murty, B.S. (2008). Effect of prior microstructure and mechanical properties of modified 9Cr- 1Mo steel weld joints. Mater. Sci. Eng. AStruct 477(1-2): 185-192.

Thomas Paul, V., Saroja, S.& Vijayalakshmi, M. (2008). Microstructural stability of modified 9Cr-1Mo steel during long term exposures at elevated temperature. J. Nucl. Mater. 378(3): 273-281.

Peddle, B.E. & Pickles, C.A. (2000). Carbide and hardness development in the heataffected zone of tempered and postweld heat-treated 2.25Cr-1Mo steel weldments. J. Mater. Eng. Perform. 9(5): 477-488.

Moorthy, V., Vaidyanathan, S., Laha, K. Jayakumar, T., Bhanu Sankara Rao, K. & Baldev Raj (1997). Evaluation of microstructures in 2.25Cr-1Mo and 9Cr- 1Mo steel weldments using magnetic Barkhausen noise. Mater. Sci. Eng. AStruct 231(1-2): 98-104.

Shankar, V., Bhanu Sankara Rao, K. & Mannan, S.L. (2001). Microstructure and mechanical properties of Inconel 625 superalloy. J. Nucl. Mater. 288(2-3): 222-232.

Farrar, J.C.M. (2004). The alloy tree: A guide to alloy steel, stainless steel and nickel base alloy. Cambridge, England: Wood Head Publishing.

Donachie, M.J. & Donachie, S.J. (2002). SUPERALLOYS: A Technical Guide. Materials Park, OH: ASM International.

Mankins, W.L. & Lamb, S. (1992). Nonferrous alloy and special purpose metal. ASM Handbook, Volume 2.

Lancaster, J. F. (1999). Metallurgy of welding (6th ed.). Cambridge: Abington Publishing: pp. 244, 249.

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Published

2011-06-30

How to Cite

[1]
N. Tammasophon, W. . Homhrajai, and G. Lothongkum, “Effect of postweld heat treatment on microstructures and hardness of TIG weldment between P22 and P91 steels with Inconel 625 filler metal”, J Met Mater Miner, vol. 21, no. 1, Jun. 2011.

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Original Research Articles

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