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Type IV Cracking Susceptibility in Weld Joints of Different Grades of Cr-Mo Ferritic Steel

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Abstract

Relative type-IV cracking susceptibility in 2.25Cr-1Mo, 9Cr-1Mo, and 9Cr-1MoVNb ferritic steel weld joint has been assessed. The type-IV cracking was manifested as preferential accumulation of creep deformation and cavitation in the relatively soft intercritical region of heat affected zone of the weld joint. The type-IV cracking susceptibility has been defined as the reduction in creep-rupture strength of weld joint compared to its base metal. The 2.25Cr-1Mo steel exhibited more susceptibility to type-IV cracking at relatively lower temperatures; whereas, at higher temperatures, 9Cr-1MoVNb steel was more susceptible. The relative susceptibility to type-IV cracking in the weld joint of the Cr-Mo steels has been rationalized on the basis of creep-strengthening mechanisms operating in the steels and their venerability to change on intercritical heating during weld thermal cycle, subsequent postweld heat treatment, and creep exposure.

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Acknowledgments

The authors thank Dr. B. Raj, Director, Indira Gandhi Center for Atomic Research (Kalpakkam, India), for his keen interest in this work. The authors thank S. Goyal for help carrying out the finite element analysis. The authors also thank N.S. Thampi for experimental assistance in conducting creep tests.

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Authors and Affiliations

  1. Metallurgy and Materials Group, Indira Gandhi Center for Atomic Research, Kalpakkam, 603 102, India

    K. Laha (Scientific Officer “G”), K.S. Chandravathi (Scientific Officer “E”), P. Parameswaran (Scientific Officer “F”) & K. Bhanu Sankara Rao (Associate Director, Materials Development and Characterization)

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  1. K. Laha
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  2. K.S. Chandravathi
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  3. P. Parameswaran
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  4. K. Bhanu Sankara Rao
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Correspondence to K. Laha.

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Manuscript submitted on July 30, 2007.

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Laha, K., Chandravathi, K., Parameswaran, P. et al. Type IV Cracking Susceptibility in Weld Joints of Different Grades of Cr-Mo Ferritic Steel. Metall Mater Trans A 40, 386–397 (2009). https://doi.org/10.1007/s11661-008-9724-x

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