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Softening Kinetics in the Subcritical Heat-Affected Zone of Dual-Phase Steel Welds

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Abstract

Welds in dual-phase (DP) steels exhibit heat-affected zone (HAZ) softening in which the tempered or subcritical HAZ exhibits a lower hardness vs that of the parent material. The rate of this softening reaction with respect to welding heat input was determined for four DP steels by making several bead-on-plate laser welds using a variety of heat inputs and measuring the resulting minimum hardness. The reduction in hardness was then fit to the Avrami equation, enabling a comparison of the relative heat needed to soften each steel. It was found that the heat input required for HAZ softening decreased as the C content of the martensite within the DP structure increased. However, the presence of carbide forming alloying elements such as Cr and Mo was able to increase resistance to softening.

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Acknowledgments

The authors would like that the staff of the Canadian Centre for Electron Microscopy and Dr. X. Wang, who assisted with the preparation and the analysis of the TEM images and SAD patterns. The authors also wish to thank ArcelorMittal for providing the experimental materials used and for permission to publish this work.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, McMaster University, L8S 4L8, Hamilton, Ontario, Canada

    E. Biro (Doctoral Student and Scientist) & J. D. Embury (Professor Emeritus)

  2. ArcelorMittal Global Research, L8N 3J5, Hamilton, Ontario, Canada

    E. Biro (Doctoral Student and Scientist)

  3. Department of Mechanical Engineering, McMaster University, Hamilton, Ontario, Canada

    J. R. McDermid (Associate Professor)

  4. Department of Mechanical and Mechatronics Engineering, University of Waterloo, N2L 3G1, Waterloo, Ontario, Canada

    Y. Zhou (Professor)

Authors
  1. E. Biro
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  2. J. R. McDermid
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  3. J. D. Embury
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  4. Y. Zhou
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Corresponding author

Correspondence to J. R. McDermid.

Additional information

Manuscript submitted March 9, 2010.

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Biro, E., McDermid, J.R., Embury, J.D. et al. Softening Kinetics in the Subcritical Heat-Affected Zone of Dual-Phase Steel Welds. Metall Mater Trans A 41, 2348–2356 (2010). https://doi.org/10.1007/s11661-010-0323-2

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