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Influence of electron beam welding parameters on microstructure and Charpy impact properties of boron-added modified 9Cr-1Mo steel weld

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Abstract

The effect of electron beam welding parameters on microstructure and ductile-to-brittle transition temperature (DBTT) of a boron-added modified 9Cr-1Mo steel weld is presented in this paper. Compared to the base metal, for the weld, the upper shelf energy is lower and the DBTT is significantly lower. While the influence of welding parameters on the upper shelf energy of the weld is insignificant, its influence on the transition region and the lower shelf region is quite significant due to the presence of delta-ferrite in the weld. High welding speed reduces the time available for transformation of delta-ferrite to austenite and results in retention of delta-ferrite in weld. Lower welding speed promotes completion of delta-ferrite to austenite transformation as cooling rate reduces which improves lower shelf energy.

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Acknowledgments

The support of Mrs. N. Sreevidya for SEM studies is gratefully acknowledged.

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Authors and Affiliations

  1. Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India

    C. R. Das, A. K. Bhaduri, S. Raju, R. Balakrishnan, S. Mahadevan & S. K. Albert

  2. Defence Research & Development Laboratory, Hyderabad, India

    P. Mastanaiah

Authors
  1. C. R. Das
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  2. A. K. Bhaduri
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  3. S. Raju
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  4. R. Balakrishnan
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  5. S. Mahadevan
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  6. S. K. Albert
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  7. P. Mastanaiah
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Corresponding author

Correspondence to A. K. Bhaduri.

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Recommended for publication by Commission IX - Behaviour of Metals Subjected to Welding

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Das, C.R., Bhaduri, A.K., Raju, S. et al. Influence of electron beam welding parameters on microstructure and Charpy impact properties of boron-added modified 9Cr-1Mo steel weld. Weld World 60, 1141–1146 (2016). https://doi.org/10.1007/s40194-016-0369-x

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  • DOI: https://doi.org/10.1007/s40194-016-0369-x

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