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Microstructure and local brittle zone phenomena in high-strength low-alloy steel welds

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Abstract

This study is concerned with a correlation between the microstructure and the local brittle zone (LBZ) phenomena in high-strength low-alloy (HSLA) steel welds. The influence of the LBZ on toughness was investigated by means of simulated heat-affected zone (HAZ) tests as well as welded joint tests. Micromechanical processes involved in microvoid and cleavage microcrack formation were also identified using notched round tensile tests and subsequent scanning electron microscopy (SEM) analyses. The LBZ in the HAZ of a mUltipass welded joint is the intercritically reheated coarse-grained HAZ whose properties are strongly influenced by metallurgical factors such as an effective grain size and high-carbon martensitic islands: The experimental results indicated that Charpy energy was found to decrease monotonically with increasing the amount of martensitic islands, confirming that the martensitic island is the major microstructural factor controlling the HAZ toughness. In addition, microvoids and microcracks were found to initiate at the interface between the martensitic island and the ferrite matrix, thereby causing the reduction in toughness. These findings suggest that the LBZ phenomena in the coarse-grained HAZ can be explained by the morphology and the amount of martensitic islands.

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References

  1. D.P. Fairchild: inWelding Metallurgy of Structural Steels, J.Y. Koo, ed., TMS, Denver, CO, 1987, pp. 303–18.

    Google Scholar 

  2. J.G. Youn and H.J. Kim:Proc. 2nd Conf. on Mechanical Behaviors of Materials, Seoul, Korea, KIM, Seoul, 1988, pp. 35–43.

  3. H.G. Pisarski and J. Kudoh: inWelding Metallurgy of Structural Steels, J.Y. Koo, ed., TMS, Denver, CO, 1987, pp. 263–75.

    Google Scholar 

  4. R. Denys and H.I. McHenry:Proc. 7th Int. Conf. on Offshore Mechanics and Arctic Engineering, Houston, TX, ASME, Golden, CO, 1988, pp. 379–85.

  5. T. Haze and S. Aihara:Proc. 7th Int. Conf. on Offshore Mechanics and Arctic Engineering, Houston, TX, ASME, Golden, CO, 1988, pp. 515–23.

  6. K. Uchino and Y. Ohno:Proc. 7th Int. Conf. on Offshore Mechanics and Arctic Engineering, Houston, TX, ASME, Golden, CO, 1988, pp. 159–65.

  7. K. Satoh and M. Toyoda:Proc. 7th Int. Conf. on Offshore Mechanics and Arctic Engineering, Houston, TX, ASME, Golden, CO, 1988, pp. 495–502.

  8. G.R. Wang, T.W. Lau, G.C. Weatherly, and T.H. North:Metall. Trans. A, 1989, vol. 20A, pp. 2093–2100.

    Article  Google Scholar 

  9. J.Y. Koo and A. Ozekcin: inWelding Metallurgy of Structural Steels, J.Y. Koo, ed., TMS, Denver, CO, 1987, pp. 119–35.

    Google Scholar 

  10. K. Masubuchi:Analysis of Welded Structures, Pergamon Press, New York, NY, 1980, ch. 2.

    Google Scholar 

  11. The Welding Institute’s Engineering Department:Metal Construction, May 1982, pp. 272–77.

  12. British Standards Institution Document BS 5762, 1979.

  13. S. Lee:Scripta Metall., 1988, vol. 22, pp. 59–64.

    Article  Google Scholar 

  14. S. Lee, D.Y. Lee, and R.J. Asaro:Metall. Trans. A, 1989, vol. 20A, pp. 1089–1103.

    Article  Google Scholar 

  15. K. Yoneo and A. Takao:J. Jpn. Weld. Soc., 1981, vol. 50, pp. 19–28.

    Article  Google Scholar 

  16. B.C. Kim, J.H. Eorn, C.S. Lee, S. Lee, and D.Y. Lee:J. Korean Weld. Soc., 1989, vol. 7, pp. 35–48.

    Google Scholar 

  17. T. Haze, S. Aihara, and H. Mabuchi: inAccelerated Cooling of Rolled Steel, P.D. Southwick, ed., TMS, Warrendale, PA, 1986, pp. 235–47.

    Google Scholar 

  18. S. Dionne, M.R. Krishnadev, L.E. Collins, and J.D. Boyd: inAccelerated Cooling of Rolled Steel, P.D. Southwick, ed., TMS, Warrendale, PA, 1986, pp. 71–84.

    Google Scholar 

  19. N.J. Kim and G. Thomas:Metall. Trans. A, 1981, vol. 12A, pp. 483–89.

    Article  Google Scholar 

  20. H. Couque, R.J. Asaro, J. Duffy, and S.H. Lee:Metall. Trans. A, 1988, vol. 19A, pp. 2179–2206.

    Article  Google Scholar 

  21. L.E. Miller and G.C. Smith:J. Iron Steel Inst., 1970, vol. 208, pp. 998–1005.

    Google Scholar 

  22. K. Park and I.M. Bernstein:Metall. Trans. A, 1979, vol. 10A, pp. 1653–64.

    Article  Google Scholar 

  23. K. Nakase and I.M. Bernstein:Metall. Trans. A, 1988, vol. 19A, pp. 2819–29.

    Article  Google Scholar 

  24. N.J. Kim and A.H. Nakagawa:Mater. Sci. Eng., 1986, vol. 83, pp. 145–49.

    Article  Google Scholar 

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Pohang Institute of Science and Technology, 790, Pohang, Korea

    B. C. Kim (Research Assistant), S. Lee (Assistant Professor), N. J. Kim (Assistant Professor) & D. Y. Lee (Assistant Professor)

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  1. B. C. Kim
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  2. S. Lee
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  3. N. J. Kim
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  4. D. Y. Lee
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Kim, B.C., Lee, S., Kim, N.J. et al. Microstructure and local brittle zone phenomena in high-strength low-alloy steel welds. Metall Trans A 22, 139–149 (1991). https://doi.org/10.1007/BF03350956

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  • DOI: https://doi.org/10.1007/BF03350956

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