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A comparative study of the heat affected zone (HAZ) properties of boron containing low carbon steels

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Abstract

Quantitative information on the HAZ hardenability of two low carbon microalloyed steels containing different boron levels (11 and 26 ppm B) has been obtained on the basis of the weld thermal simulation technique. The extent to which boron affects the HAZ hardenability was found to depend both on the peak temperature and the base plate boron content, in agreement with predictions based on a theoretical model for quench-induced segregation of boron in steel. At the highest boron level (26 ppm B), the hardenability of the grain refined region was approaching that of the grain coarsened one, which resulted in an approximately uniform microstructure within the transformed parts of the HAZ. However, indications are that additions of boron to conventional low carbon microalloyed steels should be restricted to about 10 to 15 ppm B due to the risk of embrittlement in the grain coarsened region at higher boron concentrations.

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Authors and Affiliations

  1. SINTEF-Division of Metallurgy, N-7034, Trondheim-NTH, Norway

    O. M. Akselsen

  2. The Norwegian Institute of Technology, N-7034, Trondheim-NTH, Norway

    Ø Grong

  3. Statoil, P.O. Box 300, N-4001, Stavanger, Norway

    P. E. Kvaale

Authors
  1. O. M. Akselsen
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  2. Ø Grong
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  3. P. E. Kvaale
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P. E. KVAALE, formerly with SINTEF-Division of Metallurgy

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Akselsen, O.M., Grong, Ø. & Kvaale, P.E. A comparative study of the heat affected zone (HAZ) properties of boron containing low carbon steels. Metall Trans A 17, 1529–1536 (1986). https://doi.org/10.1007/BF02650089

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  • DOI: https://doi.org/10.1007/BF02650089

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