Metallurgical and Materials Transactions A

, Volume 43, Issue 4, pp 1174–1186 | Cite as

A Comparison of Creep Rupture Strength of Ferritic/Austenitic Dissimilar Weld Joints of Different Grades of Cr-Mo Ferritic Steels

  • K. Laha
  • K. S. Chandravathi
  • P. Parameswaran
  • Sunil Goyal
  • M. D. Mathew
Article
First Online:

Abstract

Evaluations of creep rupture properties of dissimilar weld joints of 2.25Cr-1Mo, 9Cr-1Mo, and 9Cr-1MoVNb steels with Alloy 800 at 823 K were carried out. The joints were fabricated by a fusion welding process employing an INCONEL 182 weld electrode. All the joints displayed lower creep rupture strength than their respective ferritic steel base metals, and the strength reduction was greater in the 2.25Cr-1Mo steel joint and less in the 9Cr-1Mo steel joint. Failure location in the joints was found to shift from the ferritic steel base metal to the intercritical region of the heat-affected zone (HAZ) of the ferritic steel (type IV cracking) with the decrease in stress. At still lower stresses, the failure in the joints occurred at the ferritic/austenitic weld interface. The stress-life variation of the joints showed two-slope behavior and the slope change coincided with the occurrence of ferritic/austenitic weld interface cracking. Preferential creep cavitation in the soft intercritical HAZ induced type IV failure, whereas creep cavitation at the interfacial particles induced ferritic/austenitic weld interface cracking. Micromechanisms of the type IV failure and the ferritic/austenitic interface cracking in the dissimilar weld joint of the ferritic steels and relative cracking susceptibility of the joints are discussed based on microstructural investigation, mechanical testing, and finite element analysis (FEA) of the stress state across the joint.

Keywords

Weld Metal Weld Joint PWHT Ferritic Steel Weld Interface 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

Acknowledgments

The authors express their deep sense of gratitude to Mr. S.C. Chetal, Director, Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam, and Dr. T. Jayakumar, Director, Metallurgy and Materials Group, IGCAR, for their keen interest in this work and for their encouragement. The experimental help rendered by Mr. N.S. Thampi is gratefully acknowledged.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2011

Authors and Affiliations

  • K. Laha
    • 1
  • K. S. Chandravathi
    • 1
  • P. Parameswaran
    • 1
  • Sunil Goyal
    • 1
  • M. D. Mathew
    • 1
  1. 1.Metallurgy and Materials Group, Indira Gandhi Centre for Atomic ResearchKalpakkamIndia

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